242 AMERICAN NEUROPTERA 



•2. Veins of pterostigma forming an X- wings not involute Nemoiirn. 



Veins of pterostigma not forming an X, wings more or less involute; slender 

 species L.enctra. 



PTEROKARCELLA n. gen. 



Similar to Pteronarcys, but much smaller and with rather nar- 

 rower fore wings, which are furnished with fewer and more regular 

 cross-veins; the space between the basal part of the radial sector 

 and the median vein is free ; the radial sector but two forked (three 

 or more in Pteronarcys) ; and near the margin the space between 

 the median and cubitus shows normally but one row of cells (in 

 Pteronarcys there are two rows). 



Type, P. regularis Hagen. 



1*1 Itl I Mil \ n. gen 



Related to Perla. Two setae; anal space of hind wings present; 

 three ocelli ; anterior coxse well separated ; radial sector one to 

 three forked, the first beyond the anastomosis; beyond end of sub- 

 costa several cross veins, no cross-veins in subapical area ; not green- 

 ish species ; size rather small. 



Type, P. trivittata Banks. 



Acroneiiria pacifica n. sp. 



Head yellowish, with a blackish spot between the ocelli and each side extend- 

 ing obliquely forward toward the bases of antennae., clypeus black, thorax dark 

 brown, abdomen brown, more yellowish beneath, setae testaceous, wings uni- 

 formly tinted with brown (darker than in A. abnormis), legs brown, yellowish at 

 the kness. The prothorax is plainly narrowed behind, rather suddenly from the 

 middle, rugose above, with a broad shallow furrow each side of the median suture 

 (these furrows are broader than in the other species known to me, abnormis. 

 arida and ruralis). The radial sector arises farther out thau in A. abnormis, and 

 is furcate somewhat beyond the anastomosis, there are no cross-veins in the pos- 

 terior apical part of the wings. The ventral plate of the female is rounded be- 

 hind, almost angular in the middle, on each side is a transverse impression, and 

 on the basal half is a median longitudinal ridge, on the apex is an almost square 

 shining space, transversely striate. 



Length with wings 41 mm. 



Olympia, Washington [Trevor KincaidJ. 



Perla sabulosa n. sp. 



Head pale yellowish, a dark spot upon ocelli, antennae rather pale brown, pro- 

 thorax dull yellowish, abdomen pale brownish, yellowish beneath, dark on the tip 

 setae light brown, wings hyaline, scarcely smoky, legs pale testaceous, bases of tin- 

 tibiae darker as also the tarsi. Prothorax hardly as broad as usual, slightly nar- 

 rower behind, hind angles rounded, above rugose; wings reach beyond the setae. 



