ADAMS : NORTH AMERICAN DIPTERA. 441 



16. Posterior tarsi brownish black, 10.7-13.5 mm eostata Loew. 



First joint of hind tarsi brownish yellow, 7 mm boscii Macq. 



Entire tarsi dull ferruginous, 8-9 mm intermedia Walk. 



17. Pile of abdomen long, black on dorsum, pale on sides hirta Loew. 



Pile not long, differently distributed 18 



18. First joint of the antennae black tenninalis Loew. 



First joint of antennae yellow ochrocea Loew. 



Some of the species in this table were given their position 

 solely by reference to their descriptions ; hence their true loca- 

 tion might have been missed. 



Leptis pleuralis, n. sp. 



Female : Head black, grayish pollinose, pile yellowish white, 

 antennae brown, first joint yellowish, proboscis brownish yel- 

 low ; mesonotum black, gray pollinose, viewed from behind 

 SLibshining, except lateral margins and two subdorsal lines, 

 short pile yellowish, longer ones more numerous and black ; 

 humeri and postalar callosities tinged with yellow ; pleurae varie- 

 gated with brown and yellow, almost wholly devoid of pile ; 

 scutellum with a yellowish cast, brownish on top, halteres yel- 

 low ; abdomen testaceous, a spot on the fourth segment, and 

 fifth segment except narrow hind border, piceous, following 

 segments opaque, pile mostly pale yellowish, a few black ones ; 

 coxae and legs yellow, tip of tarsi brown, pile of coxae whitish 

 yellow, those of legs short, yellow and intermixed with black 

 ones ; wings hyaline, tinged with fuscous along anterior mar- 

 gin and base, stigma almost obsolete. Length, 7 mm. 



One specimen ; Washington. Close to L. albibarbis Bigot, but 

 is smaller, thorax subshiniug, coxae and legs less marked with 

 fuscous. 



Leptis albibarbis Bigot. Bull. Soc. Zool. de France, xii, p. 18. 



A male specimen from Seattle, Wash., agrees with the female 

 except that the coxae, femora largely, and scutellum are black ; 

 the abdomen is yellow, a small spot on first, third, fourth and 

 fifth segments, and sixth and seventh, except sides, black. A 

 female specimen from the same source has the anterior coxae 

 largely, and the two posterior pair at base, black, the front 

 femora with an indistinct, subapical band, and the hind pair 

 with the distal half brown. 



