SUPPLEMENT. 331 



the under side with scattered yellowish hairs. Hind tibiae 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. Fort; 

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

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

 rather dark-gray tinge, and with black veins ; the cost a 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 antenna? are considerably shorter and their last joint is much 

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

 little admixture of yellowish. 



Hab. 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 block 

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

 females of which it could be confounded, have the antenna) not 

 entirely black. 



41. I>. qiiadriflamellatlis Loew. % and 9 .— Viridis, nitens, an- 

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

 oribus oculorum ciliis albidis, ciliis tegularuin nigris, coxis anticis 

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

 alarum vena longitudinal! quarta non fracta. 



% . Duobus ultimis tarsorurn anticorum articulis depressis, atris ; larnellis 

 hypopygii ochraceis, bilobis. 



9 . Tarsis anticis inde ab articuli primi apice nigris. 



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

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

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

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



% . The two last joints of the fore tarsi flattened, black ; lamella; of the 

 hypopygium ochre-yellow, bilobed. 



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



Long. corp. 0.27. Long. al. 0.20. 



Syn. Dolichopus quadrilamdlatus Lokw, Berl. Eut. Zeitschr. VIII, 92, 83. 



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

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



