266 CHARLES A. BLAKE. 



above dusky; thorax rather closely punctured ; the suture between the pro- and 

 mesothorax deeply impressed ; scutellum subdepressed, rugose, with a transverse 

 excavation at base ; metathorax rounded, coarsely reticulated, with a double 

 shining space at base enclosed by well defined carinse ; tegulse luteous : wings 

 ample, obscure hyaline; nervures testaceous, stigma fuscous; marginal cell elon- 

 gate, regular, pointed at tip ; two submarginal cells, shaped as in P. clara ; third 

 submarginal cell obliterated ; legs luteous, with long, whitish pubescence ; the 

 four posterior femora and tibise, except extreme base and apex, more or less 

 blackish ; abdomen elongate, petiolated, oblong ovate, smooth and shining, 

 clothed with a long, thin, whitish pubescence, very sparse on the disk of the 

 large basal segment, but rather dense on the apical margins of all the segments 

 above and beneath ; the first or petiole segment elongate, rather slender at base 

 and swollen beyond the middle, with a small prominence on each side about the 

 middle. Length 9-11 mm. ; expanse of wings 17-18 mm. (Cresson.) 



Hab. — Colorado. 



Allied to P. clara, but easily distinguished by the hyaline wings. 



Photopsis nubecula Cresson. 



Male. — Uniform dull honey yellow, shining, thinly clothed with a rather long 

 whitish pubescence ; eyes large, round, entire and very prominent, as well as the 

 ocelli ; tips of mandibles black ; antenna? longer than the head and thorax, lute- 

 ous yellow ; thorax above shining, with scattered punctures, those on the pleura 

 very dense ; metathorax rugose ; tegulse honey yellow ; wings hyaline, faintly 

 iridescent, with a rather large fuscous cloud just beyond the marginal cell; ner- 

 vures yellowish, stigma rather large and blackish : marginal cell short, not longer 

 than the stigma, broadly rounded at tip ; three distinct submarginal cells, the 

 second small, subtriangular and receiving the two recurrent nervures, the third 

 still smaller and quadrate, the apical nervure about on a line with the tip of the 

 stigma; legs entirely luteous yellow, with thin, pale pubescence ; abdomen oblong 

 ovate, pointed at tip, petiolated, rather closely punctured, shining and with a 

 scattered, long, pale pubescence ; the first, or petiole segment, half the length of 

 the whole abdomen, very slender at base, with the posterior half greatly swollen 

 and ovate ; the extreme apex of the abdomen with a short, acute, recurved spine, 

 and the fourth and fifth ventral segments have at the extreme apical middle of 

 each two tufts of erect setse. Length 7-8.5 mm. 



Hab. — Colorado. Two specimens. 



Easily recognized by the fuscous cloud beyond the stigma on the 

 anterior wings ; the small specimen has the neuration of the anterior 

 wings remarkably variable ; on the left wing the third submarginal 

 cell is very narrow and transverse, while on the right wing it is ob- 

 literated and thrown into the second submarginal, making that cell 

 nearly as large as the first ; the marginal cell in both wings is nar- 

 rower than in the large specimen, and merely margins the stigma. 



Photopsis ampla Blake. 



Male.— Head transverse, small, black, polished ; eyes and ocelli large, promi- 

 nent ; mandibles honey yellow before the tips ; antennae fulvous ; thorax elon- 

 gate ovate, narrowed to apex, dark honey yellow, shining ; metathorax tapering 



