Leafcutter and Mason Bees: a Biological Catalogue of the Genus Megachile of the Neotropics Anthony Raw



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Subgenus Acentron Mitchell


Megachile subgenus Acentron Mitchell 1934: 303 & 307. Type species: Megachile albitarsis Cresson. Original designation.

Pseudocentron subgenus Acentron Mitchell 1980: 56.

Megachile subgenus Acentron Michener et al 1994: 178.

The subgenus at present includes 21 species of which one reaches U.S.A.




  1. Megachile (Acentron) acculta Cockerell

Megachile acculta Cockerell 1931c: 540. Female. Type locality: Chichenitza, Yucatan [Mexico]. Type repository: MCZ 16269. Examined.

Megachile (Acentron) acculta Ayala et al 1997: 454 (D).

ADDITIONAL REFERENCE. Cockerell 1932: 13 (K).

DISTRIBUTION. MEXICO: YU.


  1. Megachile (Acentron) albitarsis Cresson

Megachile albitarsis Cresson 1872: 263-264. Male. Type locality: Texas (Belfrage). Type repository: ANSP 2461. Examined.

Megachile optiva Cresson 1872: 268. Female. Type locality: Texas (Belfrage). Type repository: ANSP 2445. Examined. Synonymy of Mitchell 1937b: 75.(Not Megachile optiva Provancher 1882: 232 [= M. (Megachile) relativa Cresson 1878].)

Megachile newelli Cockerell 1908b: 262-263. Female. Type locality: Keatchie, Louisiana 8 July 1908 (W. Newell). Synonymy of Mitchell 1937b: 75.

Megachile kallstroemiae Cockerell 1908b: 264. Female. Type locality: Mesilla Park, New Mexico, 27 July on Kallstroemia (Cockerell). Synonymy of Mitchell 1937b: 75.

Megachile (Acentron) albitarsis Mitchell 1934: 303.

Megachile kallstraemiae Mitchell 1962: 165. (Misspelling).

ADDITIONAL REFERENCES. Ayala et al 1997: 454 (D). Cane 1979: 127 (M). Cockerell 1914b: 432 (D, F, T as M. newelli). Cresson 1916: 110 (T), 126 (T). Graenicher 1930: 162 (D, F, L). Hurd 1979: 2069 (D, F). Mitchell 1937b: 75-78 (R-FM, D, F); 1962: 165-167 (D, F, L, R- FM). Moure 1948: 332 (K). Robertson 1897: 350 (D, T); 1902: 49 (K as M. optiva).

DISTRIBUTION. MEXICO: BC; CA; CH; CP; DU; GU; JA; MI; NA; NL; OA; SI; SO; TM; VC; ZA. U.S.A.: AR; AZ; FL; GA; IN; LA; MI; MO; NC; NM; TX.

FLOWERS. Polylectic; visits 28 genera including Leguminosae, Compositae and others. Asclepias, Aster, Bidens leucantha, Cassia, Cephalanthus, Chrysopsis, Coreopsis, Crotalaria, Croton linearis, Cyrilla, Eryngium, Flaveria, Gaillardia, Galactia, Helenium tenuifolium, Helianthus, Ilex, Kallstroemia grandiflora, Lespedeza repens, Liatris, Melanthera radiata, Melilotus, Morongia angustata, Phaseolus, Pycnanthemum hypsopifolia, Rhus, Rudbeckia amplexicaulis, Sabal palmetto, Solidago canadensis, Stokesia, Verbena, Verbesina encelioides, Xiris caroliana.

LIFE HISTORY. Adults fly from May to September in northern parts and March to November in the south.

MORPHOLOGY. Articulations of hind leg.





  1. Megachile (Acentron) arnaui Moure

Megachile (Acentron) arnaui Moure 1948: 328. Male. Type locality: Tacanas, Tucuman, Argentina, January 1947 (J. M. Arnau). Type repository: UFPR.

DISTRIBUTION. ARGENTINA: TU.




  1. Megachile (Acentron) beniensis Cockerell

Megachile beniensis Cockerell 1927a: 19-20. Male. Type locality: Huachi, Beni, Bolivia (W. M. Mann). Type repository: USNM 29088. Examined.

Megachile (Leptorachis) beniensis Mitchell 1934: 302.

Synonym of Megachile costaricensis Friese 1921: 80, see Hedicke 1933: 43.



Megachile (Acentron) beniensis Raw 2002 #7: 3.

ADDITIONAL REFERENCE. Myers 1935: 137 (Trinidad, West Indies; probable misdetermination).

DISTRIBUTION. BOLIVIA: Beni- Huachu. BRAZIL: MT- Salobra.


  1. Megachile (Acentron) breviuscula Smith

Megachile breviuscula Smith 1879: 82. Female. Type locality: Orizaba, Mexico. Type repository: NHML 17a2498. Examined. The type is labelled "brevis" in F. Smith's hand.

Megachile (Acentron) breviuscula Ayala et al 1997: 454 (D).

ADDITIONAL REFERENCE. Cockerell 1905: 340 (K).

DISTRIBUTION. MEXICO: VC; Orizaba.


  1. Megachile (Acentron) candida Smith

Megachile candida Smith 1879: 82-83. Female. Type locality: Mexico. Type repository: NHML 17a2417. Examined.

Megachile candidella Mitchell 1930: 206-207. Female. Type locality: Mexico. Type repository: ANSP 4149. Examined. Synonymy of Mitchell, pers. comm. in Michener 1954: 100 (D, F, L).

Megachile (Acentron) candida Mitchell 1934: 303.

Megachile (Acentron) candidella Mitchell 1934: 303.

ADDITIONAL REFERENCES. Ayala et al 1997: 454 (D). Cheesman 1929: 145 (D). Cockerell 1896: 286 (K); 1899a: 12 (D); 1905: 340 (K); 1949: 450. Mitchell 1930: 206 (D, L). Moure 1948: 332 (K). Schwarz 1934: 19 (D).

DISTRIBUTION. BELIZE: Prieta. COLOMBIA: Magdalena- Cerro Patron (4000 ft), Rio Frio, Sevilla. GUYANA: Kartabo. HONDURAS: Zamorano. MEXICO: CP; GU; SL; TB; VC; YU- Chichenitza; Rio Nautla. PANAMA: Barro Colorado Island, Cerro Cobre, Chiva Chiva, Corozal, Farfan, Juan Mina; Panamá- Old Panamá, Panamá City, Pedregal, Pueblo Nuevo, Taboga Island, Tocumen. TRINIDAD.

FLOWERS. Elvira biflora, Melampodium divaricatum.

LIFE HISTORY. Adults fly most of the year.


  1. Megachile (Acentron) civilis Mitchell

Megachile civilis Mitchell 1930: 208-209. Female. Type locality: Villarrica, Paraguay, February 1923. Type repository: Meyer.

Megachile (Acentron) civilis Mitchell 1934: 303.

ADDITIONAL REFERENCES. Moure 1948: 331, 334 (D, K). Silveira et al 2002: 211 (D).

DISTRIBUTION. BRAZIL: AM; SP. PARAGUAY.


  1. Megachile (Acentron) costaricensis Friese

Megachile costaricensis Friese 1916: 341. Female. Type locality: San José (Schmidt) and San Mateo (Burgdorf), Costa Rica. Type repository: MNHU. The combination is based on a paratype female in USNM.

Megachile (Acentron) costaricensis Raw 2002 #7: 3.

Hedicke (1933: 43) suggests M. beniensis Cockerell is a synonym.

ADDITIONAL REFERENCE. Friese 1921: 80 (N, L, P).

DISTRIBUTION. COSTA RICA: San José.

NESTING. In bamboo stems. Cells lined with leaf cuttings.

LIFE HISTORY. Adults fly in July.

PREDATORS. Possibly Coelioxys tectiformis.


  1. Megachile (Acentron) dilatata Vachal

Megachile dilatata Mitchell 1928: 344-346. Gynandromorph. Type locality: Corumbá, Brazil, April. Type repository: ANSP 4108. Examined.

Megachile (Acentron) dilatata Raw 2002 #7: 3.

ADDITIONAL REFERENCE. Silveira et al 2002: 211 (D).

DISTRIBUTION. BRAZIL: MS- Corumbá; MT; PR.

MORPHOLOGY. Intersexes.




  1. Megachile (Acentron) eburneipes Vachal

Megachile eburneipes Vachal 1904: 13. Male. Type locality: Tucuman [Argentina], 20 Feb 1898 (Girard). Type repository: MNHN. Examined.

ARGENTINA: CA, La Rioja, TU.

Schrottky 1913b: 247 (D). Vachal 1909: 10 (K). Strand 1910: 538.

Megachile bernardina Schrottky 1913a: 209-210. Male. Type locality: Jundiahy, São Paulo, [Brazil] November 1900. Type repository: MZSP. Examined. Type missing left hind tibia and tarsi.

Megachile (Acentron) bernardina Mitchell 1943b: 663.

Megachile eburneipes Raw 2002 #7: 3.

ADDITIONAL REFERENCES. Mitchell 1930: 205 (D, M). Moure 1948: 332 (K). Silveira et al 2002: 211 (D).

DISTRIBUTION. BRAZIL: MG; MS- Pedra Branca; MT; PR; RN; RS; SP- Jundiaí.


  1. Megachile (Acentron) florensis Mitchell

Megachile florensis Mitchell 1943b: 671. New name.

Megachile manaosensis Mitchell 1930: 203-204. Male. Type locality: Flores, Manaus, Amazonas, Brazil, 2 August 1924. Type repository: Meyer. (Presumably the citation "Flores" on the data label signifies that the specimen was collected on flowers.)

(Not Megachile manaosensis Schrottky 1913a: 201. See Mitchell 1943b: 671.)



Megachile (Acentron) florensis Raw 2002 #7: 3.

DISTRIBUTION. BRAZIL: AM- Manaus.




  1. Megachile (Acentron) hastigera Moure

Megachile (Acentron) hastigera Moure 1948: 330-331. Male. Type locality: Curitiba, [Paraná, Brazil] 19 November 1937 (J. S. Moure). Type repository: UFPR.

ADDITIONAL REFERENCE. Silveira et al 2002: 211 (D).

DISTRIBUTION. BRAZIL: PR; RS.


  1. Megachile (Acentron) illustris Mitchell

Megachile illustris Mitchell 1930: 188-189. Male. Type locality: Chapada [dos Guimarães, MT], Brazil (H. H. Smith). Type repository: ANSP 4142. Examined.

Megachile (Acentron) illustris Raw 2002 #7: 3.

DISTRIBUTION. BRAZIL: MT.




  1. Megachile (Acentron) itapuae Schrottky

Megachile itapuae Schrottky 1908: 238. Female. Type locality: Encarnacion, Paraguay. Type repository: MZSP.

A female determined by Schrottky and labelled "METATIPO" in MZSP is a member of this subgenus.



Megachile (Acentron) itapuae Raw 2002 #7: 4.

ADDITIONAL REFERENCE. Schrottky 1913a: 143 (K), 183 (D).

DISTRIBUTION. BRAZIL: SP- Botucatú. PARAGUAY: Encarnacion.


  1. Megachile (Acentron) lentifera Vachal

Megachile lentifera Vachal 1909: 10. Male. Type locality: Rio Grande do Sul, Brésil. Type repository: Vachal collection, MNHN.

Megachile limae Schrottky 1913a: 176-177. Female. Type locality: Jundiaí, São Paulo, [Brazil]. Type repository: MZSP. Synonymy of Moure 1941: 92 (D).

Megachile morosa Mitchell 1930: 209-210. Female. Type locality: Buenavista, Bolivia. Type repository: Meyer. Synonymy of Mitchell 1943b: 663.

Megachile (Pseudocentron) limae Mitchell 1934: 303.

Megachile (Acentron) lentifera Mitchell 1943b: 663.

ADDITIONAL REFERENCES. Mitchell 1930: 223 (D as M. limae). Moure 1942: 309, 1944a: 16 (D as M. limae); 1948: 332 (K). Schrottky 1913a: 142 & 144 (K). Sakagami et al 1967: 272 (D, L). Silveira et al 2002: 211 (D).

DISTRIBUTION. BOLIVIA. BRAZIL: PR- São José dos Pinhais; MS; MT; PR; RS; SP- Vila Ema.

LIFE HISTORY. Adults fly from November to May in Paraná.




  1. Megachile (Acentron) manaosensis Schrottky

Megachile manaosensis Schrottky 1913a: 201. Male. Type locality: Manaus, AM, Brazil. Type repository: MZSP.

(Not Megachile manaosensis Mitchell 1930: 203. See Mitchell 1943b.)



Megachile (Acentron) manaosensis Raw 2002 #7: 4.

Schrottky considered this species to be similar to M. curvipes but it differs morphologically. Padre Moure (pers. comm.) suspects it is near M. civilis and M. verrucosa, both members of Acentron.

DISTRIBUTION. BRAZIL: AM.


  1. Megachile (Acentron) pallipes Smith

Megachile pallipes Smith 1879: 71. Male. Type locality: São Paulo [de Olivença], Amazon, [Brazil]. Type repository: NHML 17a2445. Examined.

Megachile pallidipes Dalla Torre 1896: 443. [New name, but not indicated as a replacement name. Evidently intended as a correction. Invalid emendation, D. B. Baker pers. comm].

Megachile (Acentron) pallipes Moure 1948: 334.

DISTRIBUTION. BRAZIL: AM.




  1. Megachile (Acentron) permunda Cockerell

Megachile permunda Cockerell 1912d: 56. Male. Type locality: Natal, [RN], Brazil (W. M. Mann). Type repository: AMNH. Examined.

Megachile (Acentron) permunda Raw 2002 #7: 4.

DISTRIBUTION. BRAZIL: RN.




  1. Megachile (Acentron) tupinaquina Schrottky

Megachile tupinaquina Schrottky 1913a: 202-203. Male. Type locality: Jundiaí, São Paulo. Type repository: MZSP ?

Megachile (Acentron) tupinaquina Moure 1948: 332 [key].

DISTRIBUTION. BRAZIL: BA; GO- Goias; MG; MT; PB- João Pessoa; SP.




  1. Megachile (Acentron) veraecrucis Cockerell

Megachile veraecrucis Cockerell 1896: 285-286. Male. Type locality: San Rafael, Vera Cruz, Mexico, 18 June (C. H. T. Townsend). Type repository: USNM 9659. Examined.

Megachile (Acentron) veraecrucis Ayala et al 1997: 454 (D).

ADDITIONAL REFERENCE. Cockerell 1932: 13-15 (D, K).

DISTRIBUTION. MEXICO: VC; YU.


  1. Megachile (Acentron) villarricensis Mitchell

Megachile villarricensis Mitchell. 1930: 207-208. Female. Type locality: Villa Rica, Paraguay. Type repository: Meyer.

Megachile (Acentron) villarricensis Mitchell 1934: 303.

DISTRIBUTION. PARAGUAY.





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