and Species of Fossil Cockroaches. 413 



but it evidently reached the border nearer the base than the 

 mediastinal vein, and the anal furrow is strongly curved. 

 The wing is broken at the base, but its probable length was 

 19 millim. and its breadth 7 millim. It is named after 

 Mr. Robert A. Meier, of Garo, Col., in whose shaft all these 

 specimens were obtained, and who afforded our party all 

 possible assistance in working them. 

 Triassic beds near Fairplay, Colorado. 



POROBLATTINA (7TO/90?, Blattina), nov. gen. 



Allied to Petrablattina, and especially the species of that 

 genus found in the same Triassic rocks, differing from them 

 principally in the insignificant part played by the mediastinal 

 area and the corresponding importance of the scapular area. 

 The mediastinal vein extends no further out than the anal, 

 terminating far before the middle of the wing, and has conse- 

 quently but a few offshoots ; while the mediastinal, sweeping- 

 downward away from the costal margin at the termination of 

 the mediastinal, occupies nearly half of the wing before 

 curving upward again to terminate above the apex. The 

 externo- median vein is arcuate and terminates on the lower 

 margin not far from the tip, and has only three or four 

 superior long'tudinal branches. The anal furrow is strongly 

 arcuate. The anal veins are nearly parallel to the inner 

 margin, but impinge upon it near the anal furrow. 



Povoblattina arcuata, nov. sp. 



The costal border is considerably convex. The scapular 

 vein is unusually arcuate, and has a large number of mostly 

 simple oblique branches. The externo-median and interno- 

 median veins, on the conlrary, have few and distant branches, 

 and the former is also strongly arcuate. The w T hole surface 

 of the wing is broken by closely crowded cross-veins, which 

 are more transverse to the whole wing than to the interspaces. 

 A single rather imperfect specimen is known, indicating a 

 species with a wing about 10 millim. long; the width is 

 4 millim., and apparently the wing was well rounded and 

 much shorter in proportion to its breadth than in the next 

 species. 



Triassic beds near Fairplay, Colorado. 



Poroblattina Lakesii, nov. sp. 



The costal border is nearly straight and the wing elon- 

 gate. The scapular vein is much less arcuate than in the 



