34 DIPTERA OF NORTH AMERICA. [PART II. 



thorn-like bristles. Cilia of the teguloe black. Wings grayish 

 with brownish-black veins; the last section of the fourth longi- 

 tudinal vein has a rather strong flexure in the middle, but from 

 that point runs nearly parallel with the third longitudinal vein; 

 the J* has no swelling of the costa at the tip of the first longi- 

 tudinal vein. 



Hab. Fort Resolution, Huds. Bay Territory. (Kennicott.) 



7. D. acuminata* Loew. % and 9- — Obscure viridis, pedum ni- 

 grorum tibiis anticis ex fiavo fuscis, facie alba, ciliis oculorum inferiori- 

 bus albis, tegularum ciliis nigris, lamellis hypopygii niagnis, acutis. 



Dark green; the feet black, fore tibiae brownish-yellow; face wbite ; cilia 

 of the inferior orbit white, of the teguk« black ; the large lamellae of the 

 hypopygiurn pointed at the end. Long. corp. 0.15. Long. al. 0.14 — 

 0.15. 



Syn. Dolichopus acuminatus Loew, Neue Beitr. VIII, 12, 4. 



Male. Dark green. Face narrow, white. Antennae black ; 

 their third joint short. Front metallic green. Lamella? of the 

 hypopygiurn white, large, spatule-shaped, pointed, so that the 

 upper and the lower margin strike together and there is no dis- 

 tinct apical margin ; the upper one has a narrow black border 

 and is ciliated with minute black hairs. The black femora with 

 a bluish-green reflection, and their extreme tip brownish-yellow ; 

 fore tibiae upon the greatest part of the upper side brownish-yel- 

 low, dark brown beneath ; fore tarsi brownish-black with yellow 

 base ; middle tibia? and middle tarsi brownish-black, still the' base 

 of the latter yellowish-brown ; hind tibiae and hind tarsi entirely 

 black, the latter sparsely bristly upon the first joint. Cilia of the 

 tegula? black. Wings hyaline ; the costa at the tip of the first 

 longitudinal vein not thickened ; the end of the fourth vein con- 

 verging towards the third; the hind transverse vein somewhat 

 less steep than in D. ovatus. 



Female. Very much like the male. The white face much 

 broader than in the male, still not so broad as in the female of 

 D. albiciliatus. The yellow coloring upon the upper side of the 

 fore tibia? is not only generally lighter than in the g , but also 

 often distinctly observable upon the first half of the upper side of 

 the middle tibia?. 



Hab. Washington. (Osten-Sacken.) Illinois. (Le Baron.) 



