and Species of Fossil Cockroaches. 411 



the middle of the wing. Length of wing about 17*5 millim., 

 width 5'5 millim. Named after my son, who obtained the 

 first and best specimen seen in our exploration of the beds. 

 Triassic beds near Fairplay, Colorado. 



Spiloblattina triassica, nov. sp. 



In this species the wing appears to be more slender than 

 in the others, although the exact proportions cannot be given 

 from the imperfection of the specimens ; all the branches have a 

 more longitudinal and less arcuate course, the externo-median 

 and scapular veins scarcely part from each other to give 

 place to the stigma, and the divergence of the former and the 

 interno-median veins is also less conspicuous. The wing was 

 probably about 18 millim. long and 5 millim. broad. 



Triassic beds near Fairplay, Colorado. 



S^riloblattina guttata, nov. sp. 



This species differs from the others in the stoutness of the 

 wing, which is proportionally much shorter than any of the 

 others ; in keeping with this peculiarity is the greater width 

 of both the mediastinal and scapular areas, and the more 

 rapid descent to the margin of the termination of at least the 

 former. In other respects the species completely resembles 

 8. Gardineri. Two fragments only were obtained, which 

 indicate a wing about 15 millim. long and 7 millim. broad. 



Triassic beds near Fairplay, Colorado. 



SpiloblaUina marginata } nov. sp. 



This species, of which only a single specimen was found, 

 is remarkable for the paucity of its neuration, and for the 

 fact that all the veins and branches are margined with a 

 slender dark edging. The scapular vein recedes more than 

 usually from the costal margin opposite the very slight 

 median stigma, and the externo-median vein is consequently 

 more than usually curved to make place for it. The pro- 

 bable length of the wing was 18 millim. The inner margin 

 being lost, the width can hardly be more than conjectured ; 

 but it was perhaps 7 millim. 



Triassic beds near Fairplay, Colorado. 



Oryctoblattina occidua, nov. sp. 



The veins appear to originate from the middle of the upper 

 half of the base of the wing, and have scarcely the least 

 basal arcuation. The mediastinal vein runs at but slight 



