136 MELANDER AND BRUES. [Vol.1. 



latter spot reaches only to the second longitudinal in one specimen. Veins 

 black ; costa with an elongate swelling at the junction of the humeral vein ; 

 notch at tip of fifth vein distinct. Tegulae and halteres light yellow, the 

 former with long black cilia. 



Described from two male specimens collected in North Park, 

 Colorado. 



This species is related to JoJinsoiii Aldrich, but may be dis- 

 tinguished by its wide face, totally black coxae, spotted wings, 

 and violaceous front. 



DolicJiopiis pahisfer, sp. nov. 



Bluish-green ; antennae totally black ; infraocular ciha black ; tegular 

 cilia black ; legs including coxae black ; tarsi not ornamented ; hind femora 

 ciliated in male. 



Male. Length 5-5.5 mm. Wing 4.5-5 mm. Shining bluish-green. 



Proboscis and palpi piceous. Face moderately wide, between three and 



four times as long as the width at the middle, covered with brownish-yellow 



pollen, not at all silvery. Vertex dark blue-green. Postocular cilia all 



black. Antennae totally black ; first joint with but 



few bristles above, those about the apex of the second 



joint very long below. Third joint oval, obtuse at 



apex. Arista black, pubescent, about twice as long 



as the antenna. Dorsum of thorax dark green, tinged 



with blue. In some specimens there is a median 



stripe, more blue and shining. Scutellum of the same 



color as thorax, fringed with short light-brown hairs. 



Fig. n.—D.palusier: Abdomen green, distinctly bluish in many specimens, 



male lamella. to ' J j r 7 



and verj' shining, sharply compressed towards apex 

 and somewhat inflated near the base ; destitute of light dust. Hypopy- 

 gium black, shining, slightly ochreous-dusted near the base, and bearing a 

 bunch of black hairs basally. Lamellae oval, slightly angulated inwardly, 

 nearly white, with a sharply defined black border, fringed with black bris- 

 tles which are more delicate basally. Internal appendages dark ferrugi- 

 nous. Pleurae black, white dusted, those of the prothorax green like the 

 dorsum, Legs, including coxae, wholly black, fore coxae white dusted, and 

 with short black hairs. Anterior tarsi not ornamented, about one-fourth 

 longer than the tibiae ; middle tarsi but slightly longer than tibiae. Hind 

 femora ciliated on apical half with black hairs, the longest hairs not longer 

 than the width of the femur at the point of their insertion. Posterior tibiae 

 somewhat thickened. Wings grayish ; veins black ; costa but slightly 

 thickened at tip of first longitudinal ; fourth vein not sharply bent, approxi- 

 mated with the third vein at tip. Incision at tip of fifth vein slight. Teg- 

 ulae and halteres vellow. tegular cilia black. 



