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. 



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

 (Barnston), Is this Walker's species ? 



18. P. media. 



Perla media Walker Catal. 145, 13. 



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. 



Hah. 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. 



Hah. Mexico (Hartweg). Unknown to me. Is it not P. tristis ? 



2(X 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 ; antennas 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 setaa fuscous; the 

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

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

 veins orange-yellow. (From the figure and 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. 5 — 8. Walker, 

 Catal. 158, 56. 



