SUPPLEMENT. 331 



the under side with scattered yellowish hairs. Hind tilme at the 

 tip, to a considerable extent, black; on the hind side with a gla- 

 brous streak, which reaches from the basis up to the tip. Fore 

 and middle tarsi blackened from the tip of the first joint ; hind 

 tarsi altogether black. Cilia of the tegulee black. Wings with a 

 rather dark-gray tinge, and with black veins ; the costa has, at the 

 tip of the first longitudinal vein, a very short knot-like swelling ; 

 the fourth longitudinal vein is not broken. 



Female. The plastic characters, which .distinguish the male 

 are wanting here, otherwise it resembles the male very much. 

 The antennas are considerably shorter and their last joint is much 

 smaller. The face is very much broader, grayish-white, with but 

 little admixture of yellowish. 



Hob. Canada. (Couper.) 



Observation. The male cannot be mistaken for any other 

 species. The female differs from that of D. comatus by its more 

 considerable size, darker wings, and the absence of a dark tip on 

 the hind femora. It cannot be mistaken for the as yet unknown 

 female of D. chrysostomus, on account of the extended black 

 color of the tip of its hind tibiaa. All the other species, with the 

 females of which it could be confounded, have the antennas not 

 entirely black. 



. D. qiiadrilamellatlis LOEW. $ and 9 . Viridis, nitens, an- 

 tennis nigris, margine infero articuli primi rufescente, facie alba, inferi- 

 oribus oculorum ciliis albidis, ciliis tegularum nigris, coxis anticis 

 pedibusque flavis, tarsis posterioribus inde ab articuli primi apice nigris, 

 alarum vena longitudinal! quarta non fracta. 



. Duobus ultimis tarsorum anticorum articulis depressis, atris ; lamellis 

 hypopygii ochraceis, bilobis. 



9 . Tarsis anticis inde ab articuli primi apice nigris. 



Green, shining ; antennae black ; the inferior margin of the first joint red- 

 dish ; face white ; the cilia of the inferior orbit whitish ; cilia of the 

 tegulse black ; fore coxae and feet yellow, the four posterior tarsi from 

 the tip of the first joint black ; the fourth longitudinal vein not broken. 



$ . The two last joints of the fore tarsi flattened, black ; lamellae of the 

 hypopygium ochre-yellow, bilobed. 



9 . Fore tarsi from the tip of the first joint black. 



Long. corp. 0.27. Long. al. 0.2(i. 



SYN. Dolichopus quadrilai<iellatus LOEW, Berl. Ent. Zeitschr. VIII, 92, 83. 



Mnle. Metallic green, shining. Front shining green. An- 

 tennae only of middle size, black, the inferior edge of the first 



