36 PROCEEDINGS OF THE ACADEMY OF L1885- 



ular and externomedian veins be3 r ond the middle of the wing, 

 and then their rapid convergence beyond a more or less conspic- 

 uous elongated spot (whence the generic name) which fills the 

 space so produced ; a similar arrangement is seen even more 

 conspicuously between the the externomedian and internomedian 

 veins, where the spot is much larger and round. All the species 

 are Triassic. 

 Spiloblattina Gardineri, nov. pp. 



A number of specimens of this were found, some of them nearly 

 perfect. The wing is long and slender, more than three times 

 longer than broad, the tip roundly produced. The mediastinal 

 vein terminates some way beyond the middle, approaching the 

 margin very gradually; the scapular runs parallel to the costal 

 margin, slightly more removed from it in the apical than in the 

 distal half, and terminates a little before the tip of the wing ; it 

 has many branches, usually compound ; the externomedian vein 

 begins to branch usually in the middle of the wing, about oppo- 

 site the stigma in the interspace between it and the scapular vein, 

 and its branches fill the apex of the wing. To form the enlarged 

 cell for the median stigma, the curve of the main externomedian 

 vein is graceful and very gradual. The anal terminates far before 

 the middle of the wing. Length of wing about 17*5 mm., width 5*5 

 mm. Named after my son who obtained the first and best speci- 

 men seen in our exploration of the beds. 



Triassic beds near Fairplay, Colorado. 

 Spiloblattina triassica, nov. pp. 



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 externomedian and 

 scapular veins scarcely part from each other to give place to the 

 stigma, and the divergence of the former and the internomedian 

 veins is also less conspicuous. The wing was probably about 18 

 mm. long, and 5 mm. broad. 



Triassic beds near Fairplay, Colorado. 



Spiloblattina 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 



