1923] 
The Genus Cyrtopogon 
105 
Style evidently shorter than third joint of antennse. . . 15. 
12. Thorax compressed gibbous, the undivided median stripe 
bearing a strong mane of long black pile and setiform 
hairs; scutellum margined with long black setae; costal 
and marginal cells hyaline; halteres black. (Wash.) 
maculosis Coq. 
Thorax convex as usual, with erect black pile but no mane; 
scutellar bristles less developed ; middle dorsal stripe 
geminate 13. 
13. Costa fringed with uniform close hairs; pile of face tipped 
with white; halteres black. (Cal., Or., Wash., B. C.) 
nebulo 0. S. 
Costa with only microscopic hair; white tips of facial hairs 
less evident ; costal and marginal cells brown apically . 14 . 
14. Halteres black; a single spot in first basal cell at origin of 
third vein. (Id., Wash.) punctipennis,n.^p, 
Halteres yellowish; first basal cell with two blackish spots 
near middle. (Wash., Or.) varipennis Coq. 
15. Abdomen with dense erect pile forming a bright yellow band 
across middle part, and black at tip 16 . 
Abdomen not densely clothed but sometimes with lateral 
or parted tufts of pile in male 18 . 
16. Style short and thick, almost square; wings hyaline; an- 
terior crossvein near base of discal cell; anterior tibiae 
and front tarsi with dense white pile on extensor face; 
yellow pile of abdomen confined to basal three segments. 
(Wash.) semitarius. n. sp. 
Style longer than wide; anterior crossvein near middle of 
discal cell; hairs of legs black aside from the fulvous re- 
cumbent pubescence on inside of front tibiae 17 . 
17. Wings of male with large black sharply limited spot; all 
hairs of head black; yellow hairs of abdomen confined to 
segments 2-4 (Col., Id.) dasyllis Will. 
Wings with dark spot more suffused; hairs of face and beard 
yellow; yellow hairs of abdomen extending on fifth seg- 
ment. (Wash., Or., Id., Cal., N. Y.) ... dasylloides Will. 
