596 



NEURQPTERA. 



In CloS there are but two caudal setae, and though there are 

 usually four wings, yet the hinder pair are sometimes wanting, 

 and there are few transverse veins. The eyes in the males 

 are double, large and approximate. Cloe pygmcea Hagen is 



brownish gray, with the feet and 

 setse white, and the wings hya- 

 line. It is a Canadian species. 

 Ccenis differs in having three 

 caudal setse, with no hind wings 

 developed, and few cross-veins, 

 and the eyes in the males are 

 very simple and remote. Ccenis 

 hilaris Say is small and whitish, 

 with black eyes, and the thorax is 

 pale fulvous, with short obscure 

 Fig. 578. lines beneath and on the sides. 

 Hagen states that the most abnormal Ephemerid is Oligoneu- 

 n'a, distinguished by the abortive condition of the legs, the 

 large size of the longitudinal veins of the wings, the rarity of 

 the transverse veinlets, and by a long bristle-like appendage 

 at the base of the fore wing. A closely allied genus has been 

 described by Dr. Hagen under the name Laclilania. It has 

 two caudal filaments, where Oligoneuria has three, and there 

 are three strong transverse veins in the fore wings. L. abnor- 

 mis Hagen (Fig. 578, enlarged) is a Cuban species. 



Mr. Scudder regards as the type of a distinct family, which 

 he calls the Hemeristina, a single form, the Hemeristia 

 occidentalis of Dana, which occurred with Miamia Bronsoni in 

 the Lower Carboniferous rocks of Illinois. Mr. Scudder de- 

 fines this family as consisting of " Neuroptera of large size. 

 The prothorax is quadrangular, narrower than the meso- and 

 metathorax, though not proportionally so much so as in the 

 Palceopterina; the femora (probably the front pair) are as 

 in the Palceopterina, but proportionally broader. Wings 

 large, long, about twice as broad be} r ond the middle as near 

 the base, the costal border convex in its outer half, with nu- 

 merous and prominent cross-veins but no reticulations ; when 

 at rest, overlapping quite completely, even close to the base, 



