AS COMPARED WITH THOSE OF LIVING TYPES. 189 



characters of the families, genera, and species of the fossil insects referred to in the pre- 

 vious remarks. 



Family Paueopterlna Scudder. 



Neuroptera of medium size. Body rather broad and flat ; the head horizontal. Head 

 oval, depressed ; eyes rather large, elongate ; thorax square and depressed ; the pro thorax 

 and head much narrower than the rest of the body ; legs compressed, not long ; abdomen 

 full, long, probably (like Corydalis) not corneous ; the terminal segment probably with a 

 pair of very short anal appendages. 



Wings large and regularly rounded, very broad near the base, the two pairs nearly 

 equal, extending beyond the abdomen, and when at rest both pairs reaching about the 

 same point ; with only a very few and slight cross-veins, except in the area marginalis, 

 where they are numerous and irregular ; when at rest, folded as in the Sialina. 



The v. mediastina runs parallel to the v. marginalia, but not in close proximity to it. It 

 terminates at about two thirds the distance to the apex by impinging on the v. scapularis, 

 which runs parallel and quite near to the v. mediastina, reaching the margin just before the 

 very extremity of the wing. The v. scapularis forks at about one fourth its distance from 

 the base, the upper fork taking the direction mentioned and remaining simple, the lower 

 diverging but little though with constant increment, forking at about three fourths the 

 distance from the base, the forks reforking one or more times. The upper branch is 

 connected by a few oblique cross-veins with the lower, which run outwards and down- 

 wards. The v. externo-media forks quite near the base, its branches but slightly divergent, 

 sometimes forking again. The v. inferno-media covers with its branches a wider space. It 

 is at first about as divergent from the last as that is from the lower branch of the v. 

 scapularis. It soon forks, the upper branch again forking twice, the forks remaining par- 

 allel but separated from one another at the start as widely as those of the previous vein at 

 their termination. There are one or two cross-veins uniting these forks, and one or two 

 uniting the upper branch to the lower branch of the previous vein, where it comes in close 

 contiguity. Of the v. anaKs little can be said, except that it terminates in a large number 

 of closely contiguous, parallel nervures, which arise from forks near the base, which seldom 

 refork, the branches running parallel to the innermost branch of the v. interno-media. The 

 area margimlis has a large number of irregular cross-veins curving outwards from they. 

 mediastina as in many Termitina. The wings are quite alike and weak. In the specimen 

 they are in their natural attitude of repose, overlapping one another in a loose way upon 

 the back, probably with no side support. 



Genus Miamia Dana. 



Head ovate ; eyes oblong-ovate, situated on the sides in the middle, slightly approximate 

 anteriorly, prominent above and below but not protruding laterally beyond the general 

 contour of the head ; prothorax as wide as the head, quadrangular, broadest anteriorly, the 

 anterior border very much produced forwards into a median projection, both anterior and 

 posterior angles prominent but rounded, the posterior border square ; meso- and meta-tho- 

 rax much broader than prothorax, with large, slightly elevated tubercles just within the 

 base of the wings, as in Corydalis ; middle and hind femora and tibiae broad and not long, 

 femora and tibia? of equal length ; abdomen large and plump, as in Corydalis, the basal 

 joints not quite so large as the central, tapering regularly, though but little, from the 



