DESCRIPTION OP THE SPECIES. 69 



third longitudinal vein is somewhat directed backwards towards 

 its end, so that its tip is nearer to the tip of the fourth vein than 

 is usual in other species ; the last portion of the fourth longitudi- 

 nal vein is almost straight ; on the spot where its usual flexure is 

 situated, the surface of the wing is distinctly convex ; costa but 

 indistinctly thickened at the tip of the first longitudinal vein. 



Hob. Illinois ; (Le Baron. ) 



Observation. It is to be presumed, judging from the analogy 

 of similar European species, that the 9 of D. praeustus has no 

 black spot at the tip of the wing. 



3 1 ?. D. comatus LOEW. and 9 Viridis, facie Candida, antennis 

 nigris, ciliis oculorum inferioribus albis, tegularum ciliis nigris, pedibus 

 flavis, feinoruni posticorum apice superne nigro, alarum vena longitu- 

 dinal! quart, non facta. 



Green, face snow-white, antennae black ; cilia of the inferior orbit white ; 

 cilia of the tegulse black ; feet yellow, the tip of the hind femora black 

 above ; the fourth longitudinal vein of the wings not broken. Long, 

 corp. 0.17. Long. al. 0.16. 



SYN. Dolichopus comatus LOEW, Neue Beitr. VIII, 23, 25. 



Green or bronze-green, shining. Face snow-white, that of the 

 9 rather broad. Antennae altogether black, the third joint short- 

 ovate ; arista with an almost imperceptible pubescence ; cilia of 

 the inferior orbit white. Front shining green. Abdomen with 

 distinct dark incisures. Fore coxae yellow, blackened only at their 

 very base ; in the % their inner side and their tip only, in the 9 

 almost the whole anterior side is beset with small blackish hairs. 

 Middle and hind coxae blackish, their very tip only yellow. Feet 

 yellow ; the hind coxae with a bristle before the tip and tinged 

 with brownish-black on the upper side of their tip. Hind tibiae 

 slender, their tip black. Fore and middle tarsi black from the tip 

 of the first joint ; hind tarsi altogether black. Cilia of the tegulae 

 bback. "Wings tinged with gray; fourth longitudinal vein not 

 broken. 



Male. Lamellae of the hypopygiurn hardly medium-sized, ovate, 

 whitish, on their apical edge with a vestige only of a narrow black 

 border and very little- jagged, ciliated with hairs, most of which are 

 pale. Hind tibiae on their hind side without any bare stripe. 

 First joint of the fore tarsi a little longer than the four following 

 ones taken together ; the latter are deep black and somewhat flat- 



