72 DIPTERA OP NORTH AMERICA. [PART II. 



more slender than the previous one ; the first joint is equal to 

 three-fourths of the tibia, and is somewhat longer than the second 

 and third taken together; second till fourth joints but very little 

 decreasing in length ; fifth joint deep black, somewhat flattened, 

 so that it appears like a small ovate disk ; at its extreme basis it 

 is colored with yellowish- white. Wings towards the basis rather 

 narrow, though of the usual form. Costa near the tip of the first 

 longitudinal vein with an almost imperceptible swelling. 



Hab. English River ; Red River. (Kennicott.) Sitka. (Sahl- 

 berg.) White Mountains, TS T . H. (Osten-Sacken.) 



Observation. — A very chose examination renders it certain that 

 this species, as it appears widely spread in North America, is 

 identical with the European D. discifer. I had overlooked this 

 identity, while describing it from American specimens, as D. 

 tanypus. 



40. D. iofratlis Loew. % . — Viridis, facie dilute lutescente, antennis 

 nigris, inferioribus oculorum ciliis fiavicantibus, tegularum ciliis nigris, 

 pedibus flavis, femorurn posticoruin apice concolore, tarsis anticis imie 

 ab articuli primi apice nigricantibus, articulo ultimo nigro, in mare latis- 

 simo. 



Green; face pale luteous-yellow ; antennae black; cilia of the inferior 

 orbit yellowish, cilia of the tegulse black ; feet yellow, the tip of the 

 hind femora not darker ; fore tarsi from the tip of the first joint black- 

 ish ; the last joint black, very much enlarged in the % . Long. corp. 

 0.27. Long. al. 0.26. 



Syn. Dolichopiis lobatus Loew, Neue Beitr. VIII, 24, 27. 



Bright green. Face pale yellow, rather whitish below. An- 

 tennae black, first joint red with blackish upper edge ; third joint 

 short-ovate. Front shining, green. Cilia of the inferior orbit 

 yellowish. Lamellae of the hypopygium rather large, ovate, white, 

 on the second half of the upper margin and on the apical margin 

 with a rather broad black border, jagged on the latter and beset 

 with black bristles. Fore coxae yellow, upon the front side with 

 minute yellowish hairs, only on their inner side also with a few 

 minute black hairs. Middle and hind coxae blackish, at the tip 

 yellow. Feet yellow. Hind femora not ciliated ; before the tip 

 with a bristle. Hind tibiae somewhat thickened about the middle 

 and colored with darker yellow upon their second half; their hind 

 side without glabrous stripe. Fore tarsi hardly once and a half 



