276 TERTIAKY INSECTS OF NORTH AMERICA. 



1. NECROPSYLLA gen. nov. (vexpt?, Psylla). 



This name is proposed for a species belonging to the subfamily Apha- 

 larinae, which shows a close resemblance to Psyllopsis. As there, the wing 

 is membranous. The petiolus cubiti is of the same length as the discoidal 

 part of the subcosta, and the general relation of the principal nervures is 

 the same ; it is only in minor details that it differs here, such as the excep- 

 tional length of the upper branch of the subcosta and the transverse course 

 of the lowest branch of the cubital. But the most striking difference is in 

 the form of the wing, which in Psyllopsis is pretty regularly obovate, the 

 widest part of the wing in the middle, the apex well rounded. In Necro- 

 psy lla, on the other hand, it is subtriangular, the broadest part just before 

 the apex, which is very broadly rounded ; both upper and lower margins 

 are nearly straight. Little is preserved besides the wings. 



When first noticed it was thought to belong to the Psocidre, near Pso- 

 quilla and Sphgeropsocus, and was accordingly figured among the Neurop- 

 tera. 



A single species is known. 



NECROPSYLLA RIGIDA. 

 PI. 12, Figs. 11, 21. 



Head broad, fully twice as broad as long, rounded, the nasus strongly 

 pronounced, orbicular, very large. Whole body stout, the prothorax appar- 

 ently at least three times as broad as long, the abdomen tapering a little 

 only, and furnished at the tip with a short, slender, conical, bluntly tipped 

 style. Wings two and a half times longer than broad, wedge-shaped, being 

 largest near the tip and narrowing pretty regularly toward the base, though 

 more rapidly on the basal third than beyond, the costal margin arched, the 

 tip very fully rounded, the inner margin perfectly straight. A principal 

 vein runs through the middle of the wing ; at the end of the first third it 

 divides into two forked stems, the cubital and subcostal, each of them 

 forked for the first time opposite each other at about the middle of the 

 wing; the subcostal forks only this time, its upper offshoot curving at once 

 up toward and then following close to the costal margin, where it descends 

 into the apical margin ; the cubital runs in a straight course midway 

 IK -t\veen the former and the veins below. The lower branch, on dividing, 



