40 DIPTERA OF NORTH AMERICA. [PART II. 



rounded at the tip. Front bright bluish-green. Cilia of the in- 

 ferior orbit white. Lamellae of the hypopygium white, of medium 

 size and of ovate form, upon the upper and apical margin with a 

 narrow black border, and fringed with black bristles ; on the 

 apical margin somewhat jagged. Fore coxae yellowish-white, with- 

 out minute black hairs upon the anterior side ; middle and hind 

 coxae blackish with whitish-yellow tip. Feet light yellow ; hind 

 femora beset with somewhat longer minute black hairs, without 

 being actually ciliated. Hind tibiae plain, upon the hind side 

 without glabrous stripe, at the tip blackish. Fore tarsi only 

 as long as the tibiae and but little darker than those, yellow- 

 brownish ; middle tarsi black from the tip of the first joint ; hind 

 tarsi entirely black. Tegulae with pale yellowish cilia. Wings 

 hyaline, towards the fore margin with a faint brownish-gray 

 tinge ; costa near the tip of the first longitudinal vein although 

 somewhat stouter, not actually thickened; the fourth longitu- 

 dinal vein not broken. 



Hab. Washington. (Osten-Sacken.) 



13. I>. SOCillS Loew. % . — Aeneo-viridis, facie alba, antennarum ni- 

 grarum articulo primo subtus rufo, ciliis oculorum inferioribus albis, 

 tegularum ciliis dilute fiavicantibus, pedibus flavis, coxis anticis con- 

 coloribus, tarsis anterioribus hide ab articuli prinii apice, apice tibiarum 

 posticarum tarsisque posticis totis nigris. 



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

 under side red ; cilia of the inferior orbit white ; cilia of the tegulae pale 

 yellowish ; fore coxae and feet yellow, the four anterior tarsi from the 

 tip of the first joint, the tip of the hind tibiae and the whole hind tarsi 

 black. Long. corp. 0.17. Long. al. 0.17. 



Syn. Dolichopus socius Loew, Berl. Entorn. Zeitschr. VI, 211, 60. 



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

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

 rounded at the tip. Front bright, bluish-green. Cilia of the in- 

 ferior orbit white. Lamellae of the hypopygium white, of medium 

 size, ovate, on the upper and apical margin with a narrow black 

 border and fringed with black bristles, on the apical margin 

 somewhat jagged. Fore coxae yellowish-white,_ without minute 

 black hairs upon the front side; middle and hind coxae blackish, 

 with yellowish tip. Feet pale yellow ; hind femora upon the un- 

 der side with but extremely short hardly visible hairs ; hind tibiae 



