110 PROCEEDINGS OF THE ACADEMY OF [1885. 



scapular, and anal areas, and also in the peculiarities of the 

 externomedian vein, excepting that the latter does not encroach 

 to so large a degree upon the internoraedian, the terminal offshoot 

 of which creeps along the border so as to limit the marginal 

 extent of the externomedian area almost as much below as above, 

 although the branching of the externomedian vein is scarcely 

 lessened. Length of wing, 8*5 mm.; breadth, 3*3 mm. 

 Triassic beds near Fairplay, Colorado. 



Neorthroblattina attenuata, sp. nov. 



This species departs from the t}'pical forms in its slenderness 

 and pointed apex, but it agrees so fairly in general structure that 

 it would best be placed here. The costal margin is not regularly 

 arched, being flattened mesially, while the whole wing tapers 

 beyond the basal third ; the inner margin is also arcuate, and the 

 tip bluntly pointed. The mediastino-scapular vein terminates 

 considerably befoi'e the apex, and the oppositely arcuate interno- 

 median reaches almost as far out, the branches of both nearly 

 always simple. The anal veins are only slightly irregular. 

 Length of wing, 15 mm.; .breadth, 4 mm. 



Triassic beds near Fairplay, Colorado. 



SCUTINOBLATTINA (mririvo;), gen. nov. 



In this genus, composed of small species, the front wings are 

 decidedly more coriaceous than the hind wings, so that the neura- 

 tion is often more or less obscured by it. The wing itself is 

 convex, as in the modern Phoraspis, and subtriangular in 

 form, its greatest width being near the base, while the tip is 

 bluntly pointed. The mediastinal and scapular veins are again 

 blended into one, which, instead of having a sinuous course, is 

 nearly or quite straight, and terminates below the apex of the 

 wing, while the externomedian vein follows closely parallel to it, 

 and the oblique veins of this and the internomedian veins follow 

 each other so as to make it difficult to tell where the line of 

 demarkation may lie. The anal veins sometimes fall on the 

 margin and sometimes on the anal furrow. 



Scutinoblattina Brongniarti, sp. nov. 



In this interesting species the wings are very strongly convex 

 at the base, and the whole surface is flecked with dark spots. 

 The branches part from the main veins at a similar angle on either 



