22 PROCEEDINGS OF THE NATIONAL MUSEUM vol. G^' 



cies; but for the present it seems desirable to hold it distinct. It 

 appears to differ from divisus in having the anterior and middle femora 

 and tibiae testaceous, in the almost entirely testaceous thorax, and 

 in the completely polished propleura; but I do not feel at all satisfied 

 that these differences are of specific value. 



In addition to the type I have seen only one specimen, collected 

 by C. H. T. Townsend at Brownsville, Texas. 



? CRASSOMICRODUS MELANOPLEURUS (Ashmead) 



Microdus mclanopleurus Ashmead, Proc. Calif. Acad. Sci., vol. 4, 1894, p. 125. 



I have not seen the type of this species which is apparently in the 

 California Academy of Sciences; but from the short original descrip- 

 tion it appears to belong to Ci^assomicrodiis , and it may very well 

 prove to be C. medius (Cresson), 



Genus BASSUS Fabricius 



Bassus Fabricius, Syst. Piez., 1804, p. 93. Genotype. — Ichneumon calculator 

 Fabricius (by designation of Curtis, Brit. Ent., vol. 2, 1825, p. 73). 



Agathis Latreille, Hist. Nat. Crust. Ins., vol. 13, 1805, p. 175. Genotype. — 

 Agathis malvacearum Latreille (Monobasic). 



Microdus Nees, Nov. Act. Acad. Nat. Curios, vol. 9, 1818, p. 304. Genotype. — 

 Ichneumon calculator Fabricius (Monobasic). 



Therophilus Wesmael, Nouv. Mem. Acad. Sci. Brux., vol. 10, 1837, p. 15. Geno- 

 type. — Therophilus conspicuus Wesmael = [(ilficrodws) Bassus tumidulus, var. 

 conspicuus Wesmael] (by designation of Viereck, Bull. 83, U. S. Nat. Mus., 

 1914, p. 145). 



Eumicrodus Foerster, emendation of Microdus Nees, Verh. naturh. Ver. preuss. 

 Rheinl., vol. 19, 1862, p. 247. 



Lyiopylus Viereck, not Foerster, Trans. Kansas Acad. Sci., vol. 19, 1905, p. 

 267. Genotype. — Lytopylus azygos Viereck (Monobasic). 



Aerophilopsis Viereck, Proc. U. S. Nat. Mus., vol. 44, 1913, p. 555. Genotype. — 

 Bassus (Aerophilopsis) erythrogaster Viereck (Monobasis). 



Westwood ® designated Ichneumon laetatorius Fabricius as the type 

 of Bassus, and this interpretation, which placed the genus in the 

 subfamily Tryphoninae of the family Ichneumonidae, has been gen- 

 erally foUowed. However, Curtis, as noted in the above synonymy, 

 had previously designated Ichneumon calculator Fabricius as type, 

 thus making the genus isogenotypic with Micwdus Nees, and be- 

 cause of the priority supplanting the latter name in the Braconidae. 

 This condition unfortunately was not explained until recently, when 

 Viereck'" synonymized Microdus Nees with Bassus Fabricius. Bas- 

 sus, of Authors, as shown by Bradley," is Diplazon (Nees) Graven- 

 horst. 



»Intr. Mod. Class. Ins., vol. 2, 1840, Gen. Syn. p. 59. 

 >o Bull. 83, U. S. Nat. Mus., 1914, p. 94. 

 " Trans. Ent. Soc. London, 1919, p. 59. 



