| abstract
| - Megachile (Tylomegachile) Moure 1953: 120-121. Type species: Megachile orba Schrottky. Original designation and monotypy. Michener et al 1994: 149, Michener 2000: 566. Cressoniella (Tylomegachile Mitchell 1980: 63. The six species at present included in the subgenus occur in widespread localities: Mexico, Costa Rica, St. Vincent (West Indies), Colombia, Peru and Paraguay.
* 1. Megachile (Tylomegachile) eulaliae Cockerell Megachile eulaliae Cockerell 1917b: 239-240/ Cockerell 1919a: 218-219. Female. Type locality: Santa Eulalia, Peru, 18 January 1913 (C. H. T. Townsend). Type repository: USNM 21689. Examined. Megachile (Tylomegachile) eulaliae : Raw 2002 # 7: 35. DISTRIBUTION. PERU.
* 2. Megachile (Tylomegachile) hamata Mitchell Megachile hamata Mitchell 1930: 295-296. Female. Type locality: Rio Frio, Magdalena, Colombia, 26 December 1926 (Salt). Type repository: NHML 17a2472. Examined. Megachile (Tylomegachile) hamata : Raw 2002 # 7: 35. DISTRIBUTION. COLOMBIA: Magdalena- Rio Frio, Santa Marta. FLOWERS. Machaerium humboldtiarum.
* 3. Megachile (Tylomegachile) orba Schrottky Megachile orba Schrottky 1913a: 214. Male. Type locality: Puerto Bertoni, Paraguay. Type repository: MZSP. Megachile pseudocoelioxys Schrottky 1920: 28-29. Female. Type locality: Franca, São Paulo state, Brazil, January 1903. Type repository: MZSP. Examined. Synonymy of Moure 1953: 121. Megachile nuda Mitchell 1930: 296-296. Female. Type locality: Pedra Branca, Brazil. Type repository: ANSP 4130. Synonymy of Moure 1953: 121. (Not M. nuda Rayment 1935. Australia. [= Chalicodoma (Hackeriapis) nuda]. Designation of Michener 1965: 198.) Megachile (Tylomegachile) orba : Moure 1953: 121; Silveira et al 2002: 214 (D). Megachile (Ptilosarus) orba : Michener 1954: 102 (D, F, L). (Erroneous listing). Cressoniella (Tylomegachile) orba : Mitchell 1980: 63. ADDITIONAL REFERENCES. Mitchell 1930: 255 (D); Zanella 2000: 591 (D); Viana and Alves Santos 2002: 12 (D); Rebêlo et al 2003 (D), Zanella 2003: 234 (D). DISTRIBUTION. ARGENTINA: MI- Iguazú. BOLIVIA: Buenavista. BRAZIL: BA- Salvador (Raw); DF- Brasilia (Raw); MA- Barreirinhas; MG; MS- Corumbá, Pedra Branca; MT- Bodoquena, Camisão, Chapada dos Guimarães (Raw); PR- Curitiba, Iguaçú; RN- Serra Negra do Norte; RS; SP- Batatais, Franca (MZSP), Guarulhos, Onda Verde, Rio Claro, São Paulo. COLOMBIA: Magdalena- Rio Frio. PANAMA: Canal Zone- Juan Mina. PERU: Tingo Maria (670 m). FLOWERS. Cornuta grandiflora, Machaerium humboldtiarum. LIFE HISTORY. In Panamá adults fly in June.
* 4. Megachile (Tylomegachile) simplicipes Friese Megachile simplicipes Friese 1921: 93. Sex not indicated. Type locality: San José, Costa Rica, 1913 (Schmidt). Type repository: Unknown. Megachile nigrolateralis Cockerell 1919: 217-218. Female. Type locality: Mexico (Baker). Type repository: USNM 21688. Synonymy of Mitchell 1930: 295. (Not M. lachesis nigrolateralis Cockerell 1914a: 279. Phillippines [= Creightonella lachesis (Smith) 1861]. Megachile atrolateralis : Cockerell 1927c: 5. New name for M. nigrolateralis Cockerell 1914a). Cressoniella (Tylomegachile) simplicipes : Mitchell 1980: 63. Megachile (Tylomegachile) simplicipes : Ayala et al 1997: 455 (D). ADDITIONAL REFERENCE. Cockerell 1949: 450 (D). DISTRIBUTION. MEXICO: CH; JA; MO; NA; OA; SI. COSTA RICA. HONDURAS: Zomorano. LIFE HISTORY. April to July.
* 5. Megachile (Tylomegachile) toluca Cresson Megachile toluca Cresson 1878: 129. Male. Type locality: Mexico (Sumichrast). Type repository: ANSP 2432. Megachile (Tylomegachile) toluca : Ayala et al 1997: 455 (D). ADDITIONAL REFERENCE. Cresson 1916: 132 (T). DISTRIBUTION. MEXICO: JA; ME; NA; OA; PU; SO; VC.
* 6. Megachile (Tylomegachile) tridentata Ashmead Megachile tridentata Ashmead 1900: 213. Male. Type locality: St. Vincent, [West Indies]. Type repository: NHML 17a2424. Examined. Megachile (Tylomegachile) tridentata : Raw 2002 # 7: 35. Ashmead (1900) states he is "not certain whether it was taken on this island or on Grenada." ADDITIONAL REFERENCE. Friese 1908a: 38 (D). DISTRIBUTION. ST. VINCENT.
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