30 NEUROPTERA OF NORTH AMERICA. 



Alar expanse 27 millim. 



Hob. Great Bear Lake (Richardson). Unknown to me. 



36. P. decisa. 



Perla decisa Walker, Catal. 170, 99. 



Ferrugineous, shining ; head broader than the prothorax, testa- 

 ceous, antennas fuscous ; prothorax square, rugulose, angles sub- 

 acute ; wings gray, veins black. 



Alar expanse 25 niillim. 



Hob. St. Martin's Falls, Albany River, Hudson's Bay (Barn- 

 ston). 



37. P. bilineata! 



Sialis bilineata Say, Godman's Western Quarterly Reporter, II, 165, 4. 

 Chloroperla transmarina Newm.! Mag. Nat. Hist. ser. 2, III, 87, 3. 

 Newm.l Ent. Mag. V, 499. Walk. Catal. 161, 89. Pictet. Perl. 

 283, 2. Perla picta Walk. Catal. 161, 169. 



Pale fuscous, varied with yellow ; head broader than the pro- 

 thorax, with three ocelli ; surface yellow, two, anteriorly conjoined, 

 semicircular, fuscous lines upon the disk, two straight fuscous lines 

 before the discal ones; antennas yellowish, apex fuscous, basal 

 articulation dusky ; prothorax quadrangular, yellow, rugulose, each 

 side with a broad fuscous stripe, sides straight, posteriorly hardly 

 narrower, angles acute ; the feet luteous, knees, and exteriorly 

 obscurer ; the abdomen and setae luteous, 9 antepenultimate ven- 

 tral segment rounded at apex ; wings grayish-hyaline, exteriorly 

 tinged with yellow, veins testaceous. (Female.) 



Length to tip of wings 12 millim. Alar expanse 21 millim. 



Hob. Canada ; Trenton Falls, JS"ew York ; Ohio (Schaum) ; 

 " Cincinnati, 15th May : not rare" (Say). 



38. P. severa ! 



Perla severa Hag.! 



Pale yellow ; head hardly broader than the prothorax, pale yel- 

 low, three black ocelli ; antennae pale yellow, apex obscurer ; pro- 

 thorax quadrangular, rugulose, pale yellow, a narrow brown stripe 

 upon the middle, sides straight, angles obtuse, rounded ; feet yel- 

 lowish, exteriorly obscured, tarsi blackish fuscous ; abdomen ; 



wings hyaline, veins fuscous, base and disk partly pallid. 



Length to tip of wings 13 millim. Alar expanse 23 millim. 



Hob. Island of Unga, Russian America. 



