SYNOPSIS OF NORTH AMERICAN SYRPHID^. 39 



5.— Antennte brown ; third joint small, snbqnadrate ; arista bare; facial tnliercle 

 not projecting beyond antennal process ; long pilose .... Baroni 

 Antennae light reddish-yellow; third joint rather large, oval; arista linely 

 pubescent; facial tubercle strongly projecting; pile of body short. 



petulca 9 



6.— Scutellum with bristles on its margin 7 



Scutellum without bristles on its margin 11 



7. — Second'aud third segments of abdomen chiefly opaque black; arista pubescent 



(Ueueoparea <? ) pallipest? 



tristis ^ 



Abdomen, or at least third segment, wholly shining 8 



8. — Arista pubescent ; humeri, scutellum, and lower part of the face with more or 



less reddish or yellowish ; abdomen wholly shining 9 



Arista pilose; body withovit light markings 10 



9. — Pubescence of the arista short ; face pallid below on the sides ; legs luteous, 



femora except the tip, black leucoparea 



Pubescence of the arista rather long; face with a yellowish spot on each side 



below pallipes9 



tristis 5 



10.— Legs black lugubris 



Legs in large part yellowish ; color blackish steely blue, wholly shining in the 

 female, in the male a sub-interrupted posterior opaque cross-band on the 



second abdominal segment cyanescens 



11. — Second and third segments, at l^st, of the abdomen in the male chiefly opaque 



black 12 



Abdomen wholly shining 14 



12. — Legs black ; pile of thorax black 13 



Tibiie and tarsi in large part yellowish; pile of thorax lutesceut . capillata^ 

 13. — Fourth segment of abdomen opaque, except the anterior angles ; veins of wings 



black nigripennis 



Fourth segment shining, except a median stripe; veins of wings in large part 



yellowish versipellis 



14. — Facial tubercle very obtuse, not produced beyond a line from base of anteuuaj 

 to the tip of epistoma; the concavities long and shallow . versipellis S 



Facial tubercle projecting, rounded 15 



15. — Femora almost entirely luteous parva 



Femora black 16 



16.— Veins of wings luteous (? capillata 9 ) comosa 



Veins of wings black (? nigripemm 9 )• 



(See, also, Appendix.) 



Chilosia petulca, n. sp. (Plate II, lig. 15.) 

 Habitat. — Washington Territory ! 



9. Length, 9™™. Shining green ivsh black, the Lead Miiniiig black. 

 Face with a baud of white pollen below the antennae, extending down- 

 wards narrowly along the eyes ; rather deeply concave below the an- 

 tennae, the tubercle much more prominent than the antennal process, 

 shortly and deeply concave between it and the oral margin, not much 

 produced downwards; the lower border of the cheeks gently concave. 

 Auteiinoe light reddish yellow, the third joint large, oval; the arista 

 black, finely but distinctly pubescent. Front with whitish dust near 

 the middle on the sides, pile short. Eyes pilose. Dorsum of thorax 

 -with short whitish pile; on the post-alar callosities, and border of scutel- 



