410 Mr. S. H. Scudder on new Genera 



separate widely, and occupy on the margin of the wing only 

 the lower half of the broad apex ; the anal furrow is deeply 

 impressed, and strikes the middle of the inner margin. 



Paromylacris rotunda^ nov. sp. 



The single specimen shows the larger portion of the upper 

 surface, and all the more important parts, visible from above. 

 The whole body is strongly arched, and the central portion of 

 the pronotal shield, which is twice as broad as long, is 

 elevated about 4'5 millim. above the margins. The front 

 wings are obovate, scarcely narrower at tip than at base, 

 barely twice as long as broad ; the humeral angle very pro- 

 minent. The scapular vein has four or five straight superior 

 branches ; theexterno-median vein runs parallel to the scapular, 

 and has two dichotomizing branches. The length of the wing 

 is 2d'5 millim., and its width 15 millim. 



Carboniferous deposits of Mazon Creek, 111. (Mr. R. D. 

 Lacoe, No. 2026). 



Sjnloblattina ((nriXos, Blattina), nov. sp. 



This genus is allied to Etoblattina, but differs from it and 

 from all other genera of Blattinariaj in the divergence of the 

 scapular and externo-median veins beyond the middle of the 

 wing, and then their rapid convergence beyond a more or less 

 conspicuous elongated spot (whence the generic name) which 

 fills the space so produced ; a similar arrangement is seen 

 even more conspicuously between the externo-median and 

 interno-median veins, where the spot is much larger and round. 

 All the species are Triassic. 



Spiloblatthia Gardineri, nov. sp. 



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

 nearly perfect. The wing is long and slender, more than 

 three times as long as 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 proximal half, and terminates a little 

 before the tip of the wing ; it has many branches, usually 

 compound ; the externo-median vein begins to branch usually 

 in the middle of the wing, about opposite 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 externo-median vein is 

 graceful and very gradual. The anal terminates far before 



