No. 3.] HYGROCELEUTHUS AND DOLICHOPUS. 131 



Hygroceleuthus crenatiis O. S. 



Male. Length 5-6 mm. Face yellowish-white. Antennae with the two 

 basal joints black, except a yellow protuberance on the inner side of each. 

 Arista densely pubescent. Postocular cilia black on upper third, yellow 

 below. Anterior coxae yellow, with 

 a black stripe outwardly. Femora 

 and tibiae yellow ; the hind tibiae 

 incrassate, with a shallow, broad, 

 brownish groove on the inner side. 

 Anterior and middle tibiae infuscated 

 toward the tips. Hind tarsi black 

 except base of first joint. Lamellae 

 of hypopygium nearly white, mar- 

 gined with black at the tips. Wings 

 very broad, narrowed to the base. 

 Costa moderately thickened, incision 

 at tip of fifth vein moderate. Cilia 

 of tegulae yellow, delicate, sometimes with a few black hairs intermixed. 



Female. Length 5-6 mm. Face uniform gray. First joint of antennae 

 in great part black. Arista black, slightly pubescent. Hind tibiae wholly 

 yellow, the hind tarsi with the second joint yellow at the base. Wings 

 with a distinct incision at tip of fifth vein. A stump-vein projecting from 

 the bend of the fourth vein, sometimes abbreviated. 



b 



FIG. 7. H. crenatits : a, male ; />, female. 



Numerous male and female specimens examined from Cali- 

 fornia, Washington, Wyoming, Idaho, and Vancouver Island. 



HygroceleutJi us consa ngit i- 

 neus Wheeler. 



Male. Length 5.5-6.5 mm., 

 of wing 4.5-5.5 mm. Upper 

 two-thirds of face more opaque 

 than lower third, generally 

 with two broad vertical bands 

 on upper two-thirds. Anten- 

 nae black, in small part yellow 

 below, and on mesial surface 

 of first and second joints. 

 First joint with smooth swell- 

 ing inside. Arista thick, 



FIG. 8. H. consanguineus : a, male ; b, female. 



densely pubescent. Postocular cilia black, becoming thick and flat below ; 

 upper infraorbital cilia bright orange, lower black. Lamellae of hypopygium 



