140 PROCEEDINGS OF THE AMERICAN ACADEMY 



mens before me. The submarglnal vein of the front wing terminates 

 at about the middle of the basal half of the wing, and about opposite 

 the origin of the first superior scapular branch. The mediastinal vein 

 extends about to the middle of the wing, both in the front and hind 

 wings. The scapular vein is related to the margin exactly as in 

 P. insignis, and has five or six superior branches on the hind wing, 

 six or seven on the front wing ; on the front wing they originate at 

 subequal distances apart, commencing usually at about the middle of 

 the basal half of the wing, but when there are but six branches (which 

 appears to be less commonly the case) the first originates at a greater 

 distance from the base ; on the hind wing there is greater irregularity; 

 in one specimen there are five branches on the left hind wing, the first 

 originating beyond the middle of the wing, while on the right wing 

 there is an additional vein, originating far before the second, at the 

 middle of the basal half of the wing; in another specimen (No. 8250) 

 with only five veins, the basal branch originates somewhat beyond 

 the middle of the basal half of the wing, and the others follow at 

 subequal intervals ; besides these superior, there are two inferior 

 nervulcs arising, the first at the end of the middle third of the wing, 

 opposite a superior branch, and the second opposite the succeeding 

 branch ; sometimes a third vein appears beyond these ; alter parting 

 from the scapular vein these take a longitudinal course and terminate 

 at the tip of the wing. The externomedian vein runs subparallel to 

 the scapular, diverging slightly from it and being as far from it as it 

 is from the costal margin ; it emits two or three inferior branches, 

 the last scarcely beyond the middle of the wing, the basal ones of 

 which appear to be forked, but all having an unusually longitudinal 

 course, being only slightly deflected toward the lower margin. Nothing 

 can be said of the iuternomedian vein. 



This species differs from P. insignis by its more laterally disposed 

 eyes, rounder head, differently shaped wings, more longitudinally dis- 

 posed branches of the externomedian vein, and longer and narrower 

 abdomen. 



Length of body, 10.5-12, av. 11 mm. ; breadth of thorax, 2.1 mm. ; 

 of abdomen, 2.6 mm. ; length of antenna?, 4 mm. ; of front wing, 

 13.5-15.5, av. 11 mm. ; breadth of same, 3.35 mm. ; length of middle 

 tibia, 1.65 mm. ; of abdominal appendages, 0.6^ mm. 



Florissant. 7 specimens. Nos. 4629, 4652, 5224, 6030, 8250, 861 6, 

 14167. 



