AMERICAN DIPTERA. 69 



thickly hairy. Antennse shorter than face, second joint elongate, 

 third about one and one-half times as long as second, only moder- 

 ately wide, convex before, straight behind ; arista microscopically 

 pubescent, thickened most of its length, 3-jointed, first two joints 

 very elongate. Proboscis fully as long as hight of head, rather slim, 

 elongate, labella developed; palpi long, spoon-shaped, extending 

 more than one-third their length beyond the epistoma. Thorax 

 much wider than head ; scutellum and abdomen densely set with 

 spiny macrochffitse. Abdomen much wider than thorax, rounded 

 and swollen. Legs moderately long, tibiiw spiny ; claws and pulvilli 

 of male very elongate. AVings longer than abdomen, without costal 

 spine, third vein with some weak bristles at base ; apical cell widely 

 open, ending well before tip of wing ; fourth vein curved suddenly 

 at a right angle, apical cross-vein strongly bowed in at its origin ; 

 posterior cross- vein sub-sinuate, very oblique, nearer to bend of fourth 

 vein ; both cross-veins nearly parallel with hind border of wing. 

 Type, Hydricla ambigua Macq. 



46. PseiKloliystricia ambigua Mcq. ^. 



Eyes and frontal vitta brown ; sides of front cinereous, with black hairs among 

 frontal bristles, and gray hairs along the vitta ; face and cheeks entirely cream- 

 colored, sides of face with long and fine gray hair, cheeks with gray hair poste- 

 riorly ; antenniE and arista black, the second antennal joint with a stout bristle 

 before; proboscis shining black, brown at base and tip, palpi golden-yellow, 

 brownish toward base; occiput cinereous, thickly clothed with yellowish gray 

 hair. Thorax brassy, clothed with macrochfetai and grayish hair, pleurje golden 

 with a bunch of long yellowish hair, mixed with which are black bristles : scutel- 

 lum pale flesh-colored, densely set with macrochsetse, the anterior lateral portion 

 only being without them : hypopygium considerably exserted, black, hairy. Legs 

 black, front femora golden on outside, front and middle femora with golden gray 

 hair, femora and tibije, bristly ; claws and pulvilli very long, orange-yellow. 

 Wings more or less smoky golden, yellow at base and narrowly along costa ; tegulte 

 nearly white, with yellowish borders; halteres golden-brown. Length of body, 

 14 mm.; of wing, 13 mm. 



Described from one specimen ; Guanajuato, Mexico (Dr. Alfredo 

 Duges). 



47. Pseuilohystricia exilis Towns. 



Cichona, Jamaica ; several specimens from Mr. W. Fawcett, Au- 

 gust and September. 



48. Saunclersia bicolor Will. 



San Francisco Mt., Arizona ; on large yellow composite in spmce 

 zone, one female specimen, July 1 5. Recorded from New Mexico, 

 Arizona, California, Washington. I very much suspect that van der 

 Wulp's^S. bipartita is the same species. It is described from Durango 

 Mexico, 8100 feet, and Cache, Costa Rica. Colorado (Gillette) ; one 

 specimen. 



TRANS. AM. ENT. SOC. XXII. MARCH, 1895. 



