24 NEUROPTERA OF NORTH AMERICA. 



pilose ; with last ventral segment luteous, larger, oval ; wings 

 small, shorter than the abdomen, subhyaline, veins fuscous. 



Length of body 9 millim. 



Hob. Arctic America. St. Martin's Falls, Albany River 

 (Barnston), Is this Walker's species ? 



18. P. media. 



Perla media Walker Catal. 145, 13. 



r 



Black ; head broader than the prothorax, black, the sides, poste- 

 rior margin and two spots yellowish-brown ; prothorax quadran- 

 gular, black, rugulose, with a middle sulcus; narrower posteriorly, 

 anterior angles acute, posterior ones rounded ; wings subcinereous, 

 veins black. 



Length to tip of wings? 20 millim. Alar expanse 36 millim. 



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

 ston). Unknown to me. Is it not P. immarginata ? 



19. P. aethiops. 



Perla sethiops Walk. Catal. 154, 45. 



Black ; head hardly broader than the prothorax, black ; pro- 

 thorax quadrangular, narrower behind, black, subrugulose, sub- 

 sulcated, sides convex, angles subacute ; wings blackish-fuscous, 

 veins black. (The diagnose is taken from that of Walker.) 



Length to tip of wings ? 24 millim. Alar expanse 40 millim. 



Hob. Mexico (Hartweg). Unknown to me. Is it not P. tristist 



20. P. cincta. 



Perla cincta Pict. Perl. 229 ; tab. xx, fig. 5. Walk. Catal. 156, 50. 



Black varied with yellow ; head broader than the prothorax, 

 black, in front yellow ; antenna black, the basal article fuscous ; 

 prothorax transverse, angles rounded, sides straight, surface sub- 

 rugose, black, margined with yellow, the anterior margin broader, 

 upon the middle a yellow stripe ; abdomen and seta3 fuscous; the 

 feet luteous, streak of the femora, and the knees black, tibia3 at 

 base and tarsi black ; wings tinged with yellowish, semihyaline, 

 veins orange-yellow. (From the figure ami description of Pictet.) 



Length to tip of wings 30 millim. Alar expanse 50 millim. 



Hob. Yera Cruz. Unknown to me. 



21. P. nigrocincta ! 



Perla nigrocincta Pict.! Perl. 236, 34; tab. xxii, fig. 58. Walker, 

 Catal. 158, 56. 



