136 INSECUTOR INSCITI.^ MRNSTRUUS 



ophthalma in size and length of pile, but its uniform black 

 color separates it. (Probably is close to nigrovittata.) 



Chilosia skinneri Johnson (Trans. Am. Ent. Soc, 29, p. 101, 

 1902). 



Eyes bare ; sides of face yellow and covered with whitish 

 pubescence, leaving a broad, shining medial stripe; antennae 

 reddish, upper edge of third joint dark brown ; arista bare. 

 Thorax black, dorsal portion shining and sparsely covered with 

 very fine white hairs ; humeri with a whitish bloom ; pleurae 

 with a tuft of white hairs in front of the wing base; scutellum 

 with two slight bristles ; halteres white. Legs, including coxae, 

 uniformly light yellow. Length 5.5 mm. 



May belong to tristls group but may prove to be a member 

 of the Syrphinae. 



Chilosia robusta Hine (Ohio Journ. Sci., p. 144, 1922). 



Curran writes me that he believes this species to be the same 

 as his C. columbiae. 



Chilosia sonoriana, new species. 



Shining, dark bluish black species. Eyes and face hairy; 

 scutellum with bristles. 



Female. — Shining, dark bluish black with short pile. Anten- 

 nae bright yellow, third joint rounded ; arista blackish, micro- 

 scopically pubescent. Face shining bluish black, thinly clothed 

 with fine, pale and black hairs ; deeply concaved below an- 

 tennae, tubercle protrudes noticeably beyond antennal promi- 

 nence ; epistoma a little produced beyond antennal base ; eye 

 margins narrow, with short pale pile. Mesonotum with short, 

 blackish pile, on the lateral margins with rather long black 

 hairs ; a few bristles on postalar calli ; pleurae with thick whitish 

 and black pile ; scutellum with pale pile and black marginal 

 bristles. Legs black except the apices of the femora and the 

 bases of the tibiae which are brownish. Abdomen shining, dark 

 bluish black with very short pale and dark pile, on the sides 

 longer and all pale. Wings large with a smoky tinge ; stigma 

 dark luteous ; veins black. Squamae dirty yellowish with a 



