GENERA AND SUBGENERA OF BEES—-SANDHOUSE 573 
Mesonychium LEPELETIER AND SERVILLE. 
Encycl. Méthod., Hist. Nat., Ins., vol. 10, p. 107, 1825. 
Type.—Mesonychium coerulescens LEPELETIER AND SERVILLE, 1825. (Mono- 
basic. ) 
Mesoplia LEPELETIER (—Melissa F. SmirH). 
Histoire naturelle des insectes. Hyménoptéres, vol. 2, p. 457, 1841. 
Type.—Mesocheira azurea LEPELETIER AND SERVILLE, 1825. (Monobasic.) 
Isogenotypic with Melissa F. Smiru. 
Mesotrichia WESTWoop. 
Trans. Ent. Soc. London, yol. 2, p. 112, 1888. 
Type.—Mesotrichia torrida WrStwoop, 18388. (Monobasic.) 
Metapsithyrus Popoy. 
Eos, vol. 7, p. 185, 1931. Five species. 
Type.—(Apis) Psithyrus campestris (PANzER), 1801. (Original designa- 
tion.) 
Proposed as a subgenus of Psithyrus Lepeletier. 
Metylaeus BriIDWELL. 
Proce. Hawaiian Ent. Soe., vol. 4, pp. 126 and 131, 1919. Three species. 
Type.—Metylaeus cribratus BripWELL, 1919. (Original designation. ) 
Micralictoides TIMBERLAKE. 
Ann. Ent. Soe. Amer., vol. 32, p. 397, 1939. Two species. 
Type.—Halictoides ruficaudus MIcHENER, 1937. (Original designation. ) 
Proposed as a subgenus of Dufourea Lepeletier. 
Micrandrena ASHMEAD. 
Trans. Amer. Ent. Soc., vol. 26, p. 89, 1899. 
Type.—(Micrandrena pacifica ASHMEAD, 1899)=Andrena (AMicrandrena) 
melanochroa COCKERELL, 1898. (Monobasie and original designation.) 
Micranthidium CocKERELL. 
Rey. Zool. Bot. Africaines, vol. 19, pp. 45 and 48, 1930. Seven species. 
Type.—(Anthidium) Pachyanthidium (Micranthidium) truncatum (FP. 
SmirH), 1854. (Original designation. ) 
Proposed as a subgenus of Pachyanthidium Friese. 
Micranthophora CocKERELL. 
Trans. Amer. Ent. Soc., vol. 82, p. 66, 1906. Eleven species. 
Type.—Anthophora (Micranthophora) curta PRovANcHER, 1895. (Original 
designation. ) 
Proposed as a subgenus of Anthophora Latreille. 
Micrapis ASHMEAD. 
Proc. Ent. Soc. Washington, vol. 6, p. 122, 1904. 
Type.—Apis florea Fasricrus, 1787. (Monobasie and original designation. ) 
Micraugochlora SCHROTTKY. 
Deutsche Ent. Zeitschr., p. 488, 1909. No species. 
Rev. Mus. La Plata, vol. 16 (ser. 2, vol. 3), p. 188, 1909. One species. 
Type.—Micraugochlora sphaerocephala ScHrotrKy, 1909. (First included 
species. ) 
Microdontura CocKERELL. 
Mem. Queensland Mus., vol. 9, p. 822, 1929. 
Type.—Microdontura mellea CocKERELL, 1929. (Monobasic.) 
(Micromelecta BAKER) =Zacosmia ASHMEAD. 
Invertebrata Pacifica, vol. 1, p. 143, 1906. 
Type.—Melecta maculata Cresson, 1879. (Monobasiec and original designa- 
tion.) 
Isogenotypic with Zacosmia Ashmead. 
