NATHAN BANKS. 335 



Descriptions of New Species of North American 

 Neiiropteroid Insects. 



BY NATHAN BANKS. 



In the following pages besides the descriptions of various 

 new species of our Neuropteroid insects are synoptic tables 

 of several genera, particularly of Raphidia and Rhyacophila. 

 That of Raphidia is preliminary to a revision of our species 

 of the family which is so abundantly represented in the west- 

 ern parts of our country. Of the two new genera of caddice 

 flies, Phanopsyche is very peculiar on account of the venation 

 of the hind wing, in which two veins are united for a con- 

 siderable distance. 



PERLID^. 

 Perla slossoiue n. sp. 



Head yellow with a large, median, dull black spot over ocelli and 

 scars, and down to the clypeus ; ocelli small, posterior ones wide 

 apart, fully as near to eyes as to each other, the basal two joints of 

 the antennae black, then yellow, beyond dusky ; pronotum very short 

 and broad, anterior and posterior margins convex, dull black, a broad 

 median pale stripe, thorax and abdomen black, somewhat shining, 

 dull, and finely haired below; setae nearly as long as abdomen, dull 

 black, knees pale. Wings rather short, faintly dusky, venation black, 

 except basal part of hind wings, radial sector usually with two branches 

 beyond the anastomosis. In male the dark head-mark includes a pale 

 spot between the posterior ocelli, and a transverse pale mark in front 

 of the anterior ocellus. In the male the penultimate ventral segment 

 of abdomen is slightly produced in a yellow median lobe ; the ventral 

 plate of female is very broad and evenly convex on top. 



Expanse 26 mm. 



From Franconia, N. H. (Mrs. Slosson). 



Isoperla bellona n. sp. 



Pale dirty yellow, brownish or black in the ocellar region, sometimes 

 not plainly marked ; antennae except basal fourth dark, pronotum 

 marked with black on the rugae each side, and on front and hind mar- 

 gin, rest of thorax pale, with a dark spot each side on front of meso- 

 notum ; abdomen yellowish brown ; legs and setae pale, tarsi and tips 

 of setae dark; wings faintly brownish yellow, venation brown. Ante- 

 rior ocellus barely nearer to hind ocelli than those to each other, and 



TRANS. AM. ENT. SOC, XXXVII. 



