Cressoniella (Rhyssomegachile) Mitchell 1980: 63. Type species: Megachile simillima Smith. Original designation and monotypy. Megachile (Rhyssomegachile) Michener 2000: 564. The three members of this subgenus occur in Guyana and the Amazon Basin.
* 1. Megachile (Rhyssomegachile) kartaboensis Mitchell Megachile kartaboensis Mitchell 1930: 299-300. Female. Type locality: Kartabo, British Guiana, July-August 1920 (W. M. Wheeler). Type repository: MCZ 16212. Examined. Megachile (Rhyssomegachile) kartaboensis : Raw 2002 # 7: 33. DISTRIBUTION. GUYANA.
* 2. Megachile (Rhyssomegachile) simillima Smith
Cressoniella (Rhyssomegachile) Mitchell 1980: 63. Type species: Megachile simillima Smith. Original designation and monotypy. Megachile (Rhyssomegachile) Michener 2000: 564. The three members of this subgenus occur in Guyana and the Amazon Basin.
* 1. Megachile (Rhyssomegachile) kartaboensis Mitchell Megachile kartaboensis Mitchell 1930: 299-300. Female. Type locality: Kartabo, British Guiana, July-August 1920 (W. M. Wheeler). Type repository: MCZ 16212. Examined. Megachile (Rhyssomegachile) kartaboensis : Raw 2002 # 7: 33. DISTRIBUTION. GUYANA.
* 2. Megachile (Rhyssomegachile) simillima Smith Megachile simillima Smith 1853: 185. Female. Type locality: Para [Brazil]. Type repository: NHML 17a2456. Examined. Cressoniella (Rhyssomegachile) simillima : Mitchell 1980: 63. Megachile (Rhyssomegachile) simillima : Michener 2000: 564. ADDITIONAL REFERENCE. Silveira et al 2002: 214 (D). (Friese’s record (1908a: 65) from Argentina, cited by Jensen-Haarup (1908: 105) and others = M. (Dactylomegachile) parsonsiae Schrottky 1913 after Jörgensen 1912a: 128 and Cockerell 1914b: 428.) The female labelled simillima Smith at OUM is a Pseudocentron species. DISTRIBUTION. BRAZIL: AC- Iquirí; AM- Tefé; PA- Jacareagua; RO- Pimenta Bueno. PERU: Puerto Maldonado. This species is apparently confined to the southwestern region of the Amazon basin.
* 3. Megachile (Rhyssomegachile) stabilis Mitchell Megachile stabilis Mitchell 1930: 298-298. Female. Type locality: Buenavista, Bolivia. Type repository: Meyer. Megachile (Rhyssomegachile) stabilis : Raw 2002 # 7: 33. DISTRIBUTION. BOLIVIA.