DESCRIPTION OF THE SPECIES. 39 



Upper side of the thorax somewhat pruinose, with a coppery 

 middle stripe and with a somewhat coppery-colored mark on each 

 side before the transverse suture, sometimes coppery on a larger 

 extent. Basal portion of the fore coxae blackish beyond the mid- 

 dle ; on the middle and hind ones this coloring extends almost as 

 far as the extreme tip. Feet yellow ; fore tarsi black at the tip 

 only, middle ones from the tip of the first joint ; hind tarsi entirely 

 black ; the hind femora before the tip with a bristle. Tegulse with 

 yellowish cilia. Wings rather large, hyaline ; the fourth longi- 

 tudinal vein not broken. 



Male. The lamellae of the hypopygium whitish, on the upper 

 margin with a narrow, on the apical one with a broader black 

 border, ovate ; their apical margin is fringed with black bristles 

 and jagged on its lower part. Fore tarsi slender and nearly twice 

 as long as the tibiae ; the four first joints yellow ; first joint as long 

 as four-fifths of the tibias ; second joint half as long as the first ; 

 the third one but little shorter than the second ; the fourth only 

 about half as long as the third ; the fifth joint but little longer 

 than the fourth, black, flattened, beset upon the upper margin 

 with appressed black hairs. Hind femora upon the second half 

 of the under side closely ciliated with yellow hairs. Hind tibiae 

 somewhat stout, without being actually thickened ; they are 

 glabrous upon the anterior half of their hind side. Costa near 

 the tip of the first longitudinal vein with an elongated swelling. 



Hab. English river. (Kennicott.) West Point, N. Y. (Os- 

 ten-Sacken.) 



12. D. Ibrevinaanus LOEW. . Aeneo-viridis, facie alba, antenna- 

 rum nigrarum articulo primo subtus rufo, ciliis oculorum inferioribus 

 albis, tegularum ciliis pallide flavicantibus, pedibus flavis, coxis anticis 

 concoloribus, tarsis anticis ex flavo pallide ferrugineis, intermediis inde 

 ab articuli primi apice posticisque totis cum tibiarum aplce nigris. 



Metallic-green ; face white ; the first joint of the black antennse upon the 

 under side red ; cilia of the inferior orbit white, on the tegulae yellowish ; 

 the fore coxse and feet yellow ; the fore tarsi pale rusty-brownish ; mid- 

 dle ones from the tip of the first joint and the whole hind ones, including 

 the tip of the tibiae, black. Long. corp. 0.17. Long. al. 0.17. 



SYN. Dolichopus brevimanus LOEW, Neue Beitr. VIII, 14, 8. 



Metallic-green, bright. Face white. Antennae black; the 

 whole lower margin of the first joint red ; third joint ovate, not 



