BANKS: \iw \i.i i;nl'i i.koid tNSECTS. 315 



K \ rHROPERLA, gen. nov. 



Tarsi with apical joint much longer than (Ik- other two segments together; 

 setae rather short. Palpi Bimilarto Ferla; eyes small; ocelli three; median 

 vein running parallel to radius a1 base, anal eel] with two separated branches, 

 qq cross-veins in apical part of wings except beyond end of the Bubcosta; in 

 hind wings but two median cross-veins far apart . I )iffers from Perla and ol her 

 Perlidae in the great Length of the head behind the eyes, being nearly as long 

 as the pronotum. 



Type, - K. perdita, sp. nov. 



Kathroperla PERDITA, sp. nov. 



TYPE.— M. C. Z. 10,819. British Columbia: Kaslo (Taylor). 



Brown; face in front of the anterior ocellus and laterally up to the posterior 

 ocelli yellowish; palpi and antennae brown; pronotum with median pale 

 stripe, and one each side near the lateral edge; meso- and metanotum with 

 basal median pale spot; abdomen dark brown. Wings but little infumate, 

 darker beyond the end of the subcosta; about eight costal cross-veins; three 

 or four beyond end of the subcosta; radial sector with one branch and that 

 nearer to the anastomosis than to tip, anastomosis disjointed; about eight 

 median and cubital cross-veins. Posterior ocelli as near to each other as to the 

 eves; ocellar triangle nearly equilateral; from each posterior ocellus a ridge 

 extends obliquely to the anterior edge of the eye. Pronotum about once and 

 two thirds as broad as long, sides and corners rounded. Ventral plate of 

 female large, emarginate at tip. 



Expanse 36 mm. 



ACRONEURIA MANCHURIANA, sp. nOV. 



Type.— U. S. N. M. Paratype.— M. C. Z. 10,833. Six speci- 

 mens. Manchuria and Korea: Yalu River, 150 to 200 miles from 

 mouth (A. DeC. Sowerby coll.). 



Dull brown. Head more or less dull yellowish, especially behind the ocelli, 

 ocelli more or less plainly connected by a black V-mark. Abdomen almost 

 black above, yellowish brown beneath; legs and cerci similar. Wings brown 

 infumate, rather paler in middle of cells so that some veins appear broadly 

 margined with dark; venation brownish, not pale on costal part. Ocelli in a 

 nearly equilateral triangle, hind ocelli larger than front one, hind ocelli about 

 as near eyes as to each other; lateral bosses curved, about as near ocelli as to 

 eyes, anterior bosses large, oblique, widely separated. Pronotum about one 



