46 DIPTERA OP NORTH AMERICA. [PART II. 



the tegulfe yellowish. Wings grayish-hyaline ; the .fourth longi> 

 tudinal vein not broken. 



Hale. Lamellae of the hypopygium whitish, of moderate size and 

 of a rather oval shape ; on the upper and apical margin they are 

 narrowly bordered with black ; on the latter very much jagged 

 and fringed with black bristles. Hind femora very closely ciliated 

 with yellow hairs on the middle of the under side. Fore tarsi 

 about l times the length of the tibiae ; their three first joints slender 

 and stalk-like, the first as long as the second and third taken 

 together ; the second about 1|- times the length of the third ; the 

 fourth joint somewhat more than half as long as the third and 

 somewhat broader ; upon the whole under side and upon the upper 

 side, excepting the tip, whitish ; the fifth joint somewhat longer 

 than the third and fourth taken together, flattened, extremely 

 broad, black with a silk-like reflection ; upon its outside this reflec- 

 tion takes a handsome silvery hue when viewed in a very ob- 

 lique direction. Hind tibia? considerably thickened, the greatest 

 thickness somewhat before the middle ; the anterior half of their 

 hind side without pubescence. The costa near the tip of the first 

 longitudinal vein with a rather elongated swelling. 



Hob. West Point, N". Y. ; Illinois. (Osten-Sacken.) Con- 

 necticut. (Norton.) 



IS. U. eildactylus LOEW. and 9 Aeneo-viridis, pedibus flavis, 

 coxis anticis tibiisque posticis totis concoloribus, antennis tarsisque 

 posticis nigris, horum basi flava, ciliis oculorum inferioribus tegula- 

 ruinque ciliis flavicantibus, maris duobus ultimis tarsoruni auticorum 

 articulis dilatatis et femoribus posticis ciliatis. 



Metallic-green ; fore coxae and feet yellow ; hind tibise not darker at the 

 tip ; the black hind tarsi with yellow root ; cilia of the inferior orbit 

 and of the tegulse yellowish ; the two last joints of the fore tarsi of the 

 % enlarged and the hind femora ciliated. Long. corp. 0.26. Long. 

 al. 0.25. 



SYN. Dolichopus eudactylus LOEW, Neue Beitr. VIII, 16, 11. 



Metallic-green, bright. Face of the g narrow, ochre-yellow- 

 ish ; the face of the 9 broader and yellowish-white. Antenna 

 entirely black, the lower corner of the first joint hardly somewhat 

 lighter ; third joint short. Front green, or bluish-green, bright. 

 Cilia of the inferior orbit yellowish. The more bronze-colored 

 middle line of t^e thorax usually but little distinct ; on each side 



