58 Mr. S. H. Scudder on Mesozoic Cockroaches, 



Pterinohlattina gigas. 



Ricania gigas, Weyenb. Arch. Mus. Teyl. ii. pp. 270, 271, pi. xxxv. 

 fig. 23. 



Following Grermar, Wejenbergh placed this enormous 

 species in Ricania ; but it as evidently falls here and bears 

 a close general resemblance, excepting in size, to P. penna of 

 the Purbecks. Ricania fulg ens ^ Gieb. (Brodie, pi. iv. fig. 12), 

 from the Vale of Wardour, has nothing to do with Pterino- 

 hlattina. 



This gigantic form also comes from the Oolite of Solenhofen. 



II. T'^nassic Blattarioe from Colorado, 



In a recent paper I described some of the Triassic Palseo- 

 blattariee, which I mentioned as interesting on account of 

 their special relation to the Blattarise of the same formation. 

 Brief diagnoses of these latter forms will therefore have some 

 interest, and I mention them in the order of their relation to 

 the Palgeoblattariai. 



NeOETHEOBLATTINA [veos, opdpos) , gen. uov. 



In this genus the wings are about two and a half times 

 longer than broad, with fairly well-rounded apices, the medi- 

 astinal and scapular veins amalgamated into a single vein, 

 which extends nearly to the tip, and in the middle of the 

 wing occupies nearly one half its width. The internomedian 

 vein is of varying importance, and in the large anal area the 

 veinlets terminate on the margin ; the anal furrow is strongly 

 arcuate and deeply impressed. 



Neorthrohlattina albolineata, sp. nov. 



The single wing has lost the tip, but all the essential fea- 

 tures are preserved excepting the form of the tip. The wing- 

 is very dark-coloured, and the veins appear as very pale lines 

 upon it. The costal margin is gently and equably arched, 

 while the inner margin is perfectly straight. The externo- 

 median vein is little developed, first forking, and then not 

 widely, in the middle of the wing, its fuller development 

 being prevented by the ample and unrestricted development 

 of the internomedian vein, which runs in a full rounded course 

 nearly to the tip of the wing. The anal area is interesting 

 because the veins of the upper half run close to, but do not 

 impinge upon, the anal furrow, curving downward just before 

 reaching it, and either running into the next vein below and 

 terminating there, or continuing parallel to the furrow and 

 terminatins; on the inner border. LcD^'th of frao-ment 7 



