THE CANADIAN ENTOMOLOGIST. 1 37 



cilia of tegulse black ; wings unspotted, fourth longitudinal not broken ; 

 hind tibiae tipped with brown ; antenna? black, red below on first joint ; 

 fore coxae reddish in front ; fore legs plain ; vertex violet-bronzed. 



Male. — Length 5 mm., length of wing 4.5 mm. Face and palpi 

 yellowish white. Antennas lengthened, the joints subequal in length, 

 black ; first joint reddish below, third with the arista preapical, a little 

 longer than antenncE. Vertex violaceous with a cupreous tinge. Infra- 

 ocular cilia pale yellow. Dorsum of thorax and scutellum bronzed-green, 

 shining, not dusted. Abdomen strongly compressed, bronzed-green, 

 shining, slightly dusted, incisures not well marked. Hypopygium not 

 large, lamellae rounded apically, yellowish-tinged, narrowly black- 

 bordered, and fringed. Pleura dark green, dusted, yet shining in places ; 

 the place of the usual velvety-black antealar spot is taken by a Y-shaped 

 cupreous groove. Bases of middle and hind coxae and posterior face of 

 front coxae piceous, glaucous ; the anterior face of the front coxfe is dark 

 yellow, sharply limited, without the usual coating of black hairs, but with 

 three of the strong apical ones and a few pale hairs. Femora yellow, the 

 hind ones not ciliated and with a single aiiteapical bristle ; tibife yellow, 

 except the hind ones at tip on inner side, an elongate apical "dimple" 

 and a narrow glabrous streak on the posterior face of hind tibiae, the 

 dimple nearer the outside ; tarsi plain, blackened from tip of first joint 

 (hind ones missing in male) ; pulvilli whitish. Wings grayish-hyaline ; 

 veins not black • fourth vein obtusely, but sharply, bent; posterior cross- 

 vein distant less than twice its length from tip of fifth ; costa with a 

 small, lengthened, node-like swelling beyond junction with first vein. 

 Tegulaj and halteres light yellow, the former with very long black cilia. 



The female differs from the male by the broader, grayer face; greener 

 front ; shorter tegular cilia ; no costal node nor impression in hind tibia ; 

 front face of fore cox^e with black hairs. Hind metatarsus with basal 

 two-thirds yellowish. 



One male and one female from x^atrona Co., August 31, 1895, and 

 one female from Little Wind River, September 2, 1895, Wyoming \ col- 

 lected by Dr. Wm. M. Wheeler. 



From the only species with which this could be confounded in any 

 way (setosus, p/atyprosopus, prceustjis, fulvipes and Coqiiilletti) this 

 species may be readily distinguished by the first short diagnosis. 

 3. Gymnoptenius niirificus, n. sp. (Fig. 13.) 



Very similar to G. phyllophorus, Loew, from which it differs by the 



