136 ME LANDER AND BRUES. [VOL. I. 



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 Johnsoni Aldrich, but may be dis- 

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

 and violaceous front. 



Dolichopits paiuster, sp. nov. 



Bluish-green ; antennae totally black ; infraocular cilia 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. 

 10.13. . Abdomen green, distinctly bluish in many specimens, 



and very 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 yellow, tegular cilia black. 



