13G . PROCEEDINGS OF TUB AMERICAN ACADEMY 



mediastinal veins both present, the latter distinct and reaching nearly to 

 the middle (sometimes only to the end of the basal thiid) of the costal 

 border; scapular vein running parallel to tiie costal margin to the tip 

 of the wing and emitting from five to seven very oblique gently curv- 

 ing superior branches at partly regular intervals, the second arising 

 before the middle of the vein ; it also emits a couple of inferior 

 branches from opposite the base of two of the later branches which 

 strike the apex of the wing, diverging from the main vein no more 

 than the superior branches. Externomedian vein also running par- 

 allel to the costal margin throughout the greater part of the wing, 

 and not so far removed from the scapular as the latter is from the 

 costal margin ; it has four or five simple or forked branches, mostly 

 arising in the basal third of the wing, and with these branches takes 

 a remarkably longitudinal course obliquely toward the hind margin 

 and parallel to the inferior apical branches of the scapular vein ; it 

 therefore occupies the greater part of the wing. The internomedian 

 vein is reduced to a very contracted area, consisting apparently of 

 only a single forked vein or tw^o in the narrowing basal part of the 

 wincr. The feeble character of the externomedian and internomedian 

 veins, as well as of the inferior branches of the scapular vein, prevents 

 their preservation on most of the fossils, and it is only in a few speci- 

 mens that the whole or nearly the whole can be made out. There 

 is apparently no network or reticulation anywhere on the membrane 

 of the wing. The abdomen is large and ovate, generally broader than 

 the rest of the body. 



This srenus, which is most nearly allied to Termopsis and Calo- 

 termes, differs from each of them in points wherein they differ from 

 each other, and has some peculiarities of its own. It differs from 

 Calotermes in its shorter wings (relative to the length of the body), 

 which lack any fine reticulation, and in its want of ocelli. From 

 Termopsis it differs in its slenderer but yet shorter wings, without 

 reticulation, its uniform scapular vein, running paiallel to the costa 

 throughout and provided with fewer and straight branches. From 

 both it differs in the presence of distinct inferior branches to the 

 scapular vein, but especially in the slight development of the interno- 

 median vein, the excessive area of the externomedian vein, and the 

 course of the latter, which is approximated much more closely than 

 usual to the scapular vein and emits branches having an unusually 

 lonfritndinal course. These last peculiarities also separate this 

 genus still more widely from Ilodofcrmes, witli which it agrees 

 pretty closely in many points, and in which Ilagcn places most of the 



