Mt. S. H. Scudder oa Mesosoic Cockroaches, 55 



PtEEINOELATTINA {TTTepivoi) 



is proposed. The wings were very broad, expanding con- 

 siderably beyond the base, broadest beyond the middle, and 

 filled with an abundance of branching veins. The mediastinal, 

 scapular, and externomedian veins ran close together, side by 

 side, in a perfectly straight course (the shaft of the feather) , 

 from near the middle of the base of the wing toward and nearly 

 to a point on the costal margin a little within the apex of the 

 wing, and the superior mediastinal and inferior externomedian 

 branches, crowded closely together, parted from this appa- 

 rently common stem at nearly similar angles on either side of 

 it. The complete independence of the mediastinal, scapular, 

 and externomedian veins shows that the genus falls in the 

 Palteoblattarige, The species are all small- 



Pterinohlattina pluma. 



Blatta pluma, Gieb. Ijis. der Vorw. p. 322. Figured by Westw. Quart, 

 Journ. Geol. Soc. Lond. x. pi. xv. fig-. 14t. 



The specimen, the original of which I have had the privi- 

 lege of studying, by the favour of ray kind friend, the Rev, 

 P. B. Brodie, is rather imperfect, and a little deceptive from 

 the fact that just that portion of the tip is missing which con- 

 tains the scapular branches ; it is probable, however, from the 

 longitudinal character of the apical externomedian offshoots, 

 that the species more closely resembles P, chrysea than F, 

 intermixta. All the mediastinal branches are simple, parallel, 

 equidistant, almost straight, closely crowded, and part from 

 the main stem at an angle of about 45°, The externomedian 

 branches, the only others preserved, part at a less angle, gradu- 

 ally become quite horizontal apically, are nearly as close at 

 base as the scapular branches, and as most of them fork and 

 even refork, though with entire ii-regularity, become exces- 

 sively crowded towards the margin. The length of the frag- 

 ment is 9 millim., its breadth 5 millim. Probably the wing 

 was 12 millim, long, and 5*5 millim. broad. 



It was found in the Corbula or Pecten beds of the Dorset 

 Purbecks of England. 



Pterinohlattina pennu^ sp. nov. 



The single specimen of this species at hand is preserved in 

 much the same manner as the last, but shows a fragment of 

 the internomedian region. The three principal veins approach 

 each other very gradually, so as to give them the appearance 

 of a tapering rod. The mediastinal branches part from the 

 stem at nearly a right angle near the base of the wing, gradu- 



