156 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO, 



a little before the middle ; veins brown ; poisers yellow, with 

 brown tips. Length of body 10 mm. ; of the wings 16 mm. 

 St. Martin's Falls, Albany River, Hudson's Bay. A male 

 specimen in the Loew collection at Cambridge, Mass., has the 

 apical half of the antennae nearly white, sharply contrasting with 

 the basal half. 



4. Diomonus suhcceruleus Coquillett. 



1901. suhcceruleus, Coquillett. Proc. U. S. Nat. Mus. 595. 



Male. Length 9 to 13 mm. Black, polished and strongly 

 tinged with blue, the mouth parts brownish yellow, antennae 

 dark brown, a yellow spot on each prothoracic spiracle; coxae, 

 femora, and tibiae, yellow, the tarsi brownish yellow, halteres 

 yellowish brown, the apices and peduncles yellow; hairs of 

 mesonotum short, depressed, yellow, those of the sides, head, 

 and abdomen rather long and black ; wings densely hairy, gray- 

 ish hyaline, a brownish spot at the R-M crossvein and a second 

 beneath apex of R^; cubitus forking before base of radial sec- 

 tor ; cell R^ about as broad as long ; front tibiae noticeably short- 

 er than the first joint of their tarsi; middle femora each bearing 

 a robust, outwardly directed spine on the under side a short 

 distance before the apex. Apical half of antenna of female light 

 yellow. N. H., Pa., Canada. 



5. Diomonus pulcher, Johannsen. 

 1903. pulcher, Johannsen, Ent. News. XIV. 14. (Sciophila). 



This fly differs from ,S. suhccerulea Coq. in the following par- 

 ticulars : The thorax has no bluish tinge, the mouth parts are 

 black and not yellow, and the antenna are gray. 



Male. Length 10 mm. Black, polished, with a brownish 

 tinge. Palpi black, basal joint yellowish; face, front and occi- 

 put shining black. Antennae fuscous, with whitish, very short 

 appressed pile. Dorsum of the thorax, scutellum, metanotum 

 and pleura polished black, sparsely covered with very short pale 

 hairs; the prothoracic spiracle, the dorso-pleural suture, and 

 behind the root of the wings slightly yellowish. Abdomen shin- 

 ing black with a brownish tinge, especially at the incisures and 

 the venter. The hairs covering the abdomen are short and 

 pale. Femora and coxae, and anterior and middle tibiae are a 

 deep yellow; hind tibiae are slightly infuscated, all tarsi are 

 brown, darker apically; tips of the posterior femora and of all 

 tibiae are brown. The middle femora have a short, stout, blunt 



