354 



PSYCHE. 



[June. igo2 



by Riley from larvae found in the pulp 

 of an osage orange. The larva of an 

 European genus of Ulidinae which has 

 been described by Brauer (loc. cit.), is 

 quite similar to that of Euxesta. 



The imagines which I bred do not 

 agree very well with Loew's description 

 of E. nitidivenfris, yet seem undoubtedly 



blackened. Face at antennae with a white 

 tran6ver.se poUinose stripe, blue below; 

 cheeks white pollinose. Thorax and abdo- 

 men dark shining metallic blue. All the 

 coxae brown, anterior and posterior ones 

 slightly blackened. Anterior legs black 

 except basal two thirds of first tarsal joint. 

 Middle and posterior legs black, with knees 

 yellow and tibiae brownish on inner side, 

 first joint of tarsi also yellow. Wings hya- 

 line, with an apical dark spot extending 

 slightly beyond the third longitudinal 

 vein, also a median .spot at tip of auxil- 

 iary vein extending to a little beyond 

 the third vein. 



Female. Differs from Loew's descrip- 

 tion as foUovvs : femora metallic blue, 

 often brownish tinged. Knees yellowish, 

 tibiae brownish black, tarsi black except 

 first joint. 



PSEUDOPYRELLIA CORNICINA Fabr. 



During the month of December, 

 while collecting insects in cow dung, 

 I unearthed several remarkable dip- 

 terous larvae of a brilliant blue 

 color. On the evening of the same 

 day they began rapidly to lose their 

 brilliancy and pupated during the fol- 

 lowing night. After several weeks 

 Euxesta nitidiventris L\v. Wing, larva and head they emerged and proved to be 



of larva, showing mouth-parts. 



to belong to the same species. I there- 

 fore append a description of both sexes 

 in their fully mature state. 



Male. Length 3.5-4 tnm., of wing 3.25- 

 3.50 mm. Dark shining metallic blue, vertex 

 blue, front brown. Antennae red brown, 

 arista, dorsal and apical part of third joint 



specimens of the common Muscid 

 fly, Pseudopyrellia cornicina Fabr. 

 I am at a loss to account for such a 

 bright color in this Muscid larva, living 

 concealed from view during its entire 

 life, as all or very nearly all other larva 

 which feed upon cow dung are colorless 

 or of a somber brownish color. 



