268 CHARLES A. BLAKE. 



Pliotopsis atrata Blake. 



Mate. — Uniform black, shining, thinly clothed with a few scattered, erect hairs ; 

 head transverse, as wide as thorax ; antennpe fuscous, mandibles dark ferruginous ; 

 eyes large, round, prominent; thorax robust, ovate, narrowed posteriorly, flanks 

 beneath the wings much swollen ; wings hyaline, iridescent ; marginal cell very 

 short, arcuate, rounded at apex, first submarginal large, second triangular, re- 

 ceiving the first recurrent near the base, third quadrate, receiving the second 

 recurrent before the middle ; stigma large, black ; tegula honey yellow ; femora 

 black, tibiae and tarsi fuscous, chrthed with pale pubescence; abdomen elongate 

 ovate, petiolate; petiole pyriform, with a longitudinal dorsal impression, not 

 extending to apical margin, which is constricted, and on ventral surface a longi- 

 tudinal sulcus, widening to apex ; apical margins of segments narrowly fusco- 

 ferruginous. Length 7-9 mm. 



Hab. — Nevada. Seven specimens. 



Easily distinguished by the uniform black color and extreme 

 shortness of the marginal cell. 



Photopsis albipes Cresson. 



Male. — Uniform dark honey yellow, clothed with long, thin, pale pubescence, 

 more dense on abdomen, spai-sely punctux-ed, metathorax closely and rather 

 coarsely reticulated ; mandibles pale, with black tips and long hairs ; palpi pale ; 

 antennte yellowish white, scape with long haii-s ; wings pale yellowish hyaline ; 

 marginal cell with a fuscous cloud, rather narrow, about equal in length with 

 the stigma, truncate at tip ; second submarginal cell subtriangular, the third sub- 

 quadrate, slightly narrowed beneath ; legs entirely yellowish white, clothed with 

 long whitish pubescence ; abdomen more or less tinged with fuscous, ovate, petio- 

 late, the petiole long, much swollen beyond the middle, strongly and rather 

 closely punctured, the apex strongly constricted. Length 11-12 mm. (Cresson.) 



Hab. — Nevada. 



Pliotopsijsi sobrinus u. sp. 



31ule. — L^niformly dark honey yellow, transversely rounded, as wide as the 

 thorax, shining and minutely punctured ; eyes and ocelli large and prominent, 

 mandibles bidentate at tips; antennae long, fulvo-testaceous ; thorax elongate 

 ovate, narrowed posteriorly, mesothorax convex, shining, very minutely and dis- 

 tantly punctured and having on the disc two deeply impressed, longitudinal lines 

 extending to the scutellum, which is convex and polished ; metathorax roundly 

 truncate, the dorsal groove reaching to the apex ; wings faintly yellowish hyaline, 

 marginal cell short, ovate and abruptly truncate at tip, three submarginal cells, 

 the first elongate subquadi-ate, as large as the second and third combined, the 

 second forming a small right angle triangle and receiving the first recurrent 

 nervure close to the base, the third quadrate, receiving the second recurrent 

 nervure at middle; stigma large, ovate, dark honey yellow; tegulje moderately 

 large, pale honey yellow, polished ; legs concolorous with the body, very sparsely 

 clothed with yellowish hairs; abdomen elongate ovate, petiolate narrowed to 

 apex, polished ; petiole subpyriform, having a slight longitudinal depression on 

 the disc, extreme apex fuscous, ventral surface, second and remaining .segments 

 more or le.ss stained with testaceous. Length 12 mm. ; expanse of wings 22 mm. 



Hab. — Colorado. 



