Cockerell — Descriptions of Fossil Insects. 



81 



of second spot distinctly emarginate ; third spot reniform, its middle 

 about 10 mm. from middle of second. 



Carboniferous (Pennsylvanian), in a nodule at Mazon Creek, Illinois; 

 discovered by Mr. J. C. Carr, after whom the genus is named, and sub- 

 mitted for examination through the kindness of Mr. L. E. Daniels. This 

 genus seems to be closely allied to Pachytylopsis DeBorre, from the West- 

 phalian of Belgium ; so much so that it might be possible to interpret the 

 genus in a broad sense to include Palaeocarria. The structure of the 

 thorax in Pachytylopsis is unknown ; and there are differences in the 

 venation which, taken with the difference in locality, indicate that the 

 Belgian and American insects can hardly be congeneric. The beautiful 

 photographic figure of Pachytylopsis published by Handlirsch in 1904 sug- 

 gests that the wing was banded, though this appearance may possibly be 

 due to inequalities in the rock. Palorthopteron melas Handlirsch, also 

 from the Westphalian of Belgium, closely resembles the hind wing of 

 Palaeocarria and Spaniodera. May it not be the hind wing of Pachyty- 

 lopsis persenairei DeBorre? 



Qenentomum carri, new species. 



Wings about 48 mm. long and 12 broad ; differing from G. validum 



Scudder as follows : Anterior wing. Radius with a single branch from 



upper side, this very long, taking its origin about 5 mm. before end of 



subcosta, and running 



nearly parallel with 



radius ; combined radial 



sector and media with 



four oblique branches 



from lower side, the first 



(as in G. validum) very 



near the junction of the 



two veins ; last oblique 



branch of media before 

 Fig. 4. Qenentomum carri. the j unction more than 



twice as far from penultimate branch as from junction. 



Hind wing. Radial sector with a simple branch, beyond the last 

 forked one. 



In a nodule from the Carboniferous (Pennsylvanian) of Mazon Creek, 

 111. (J. C. Carr). Transmitted by Mr. L. E. Daniels. This very fine 

 specimen shows only the wings, but they are very characteristic of the 

 genus. The CEdischiida?, to which Genentomum belongs, are only known 

 in America from Mazon Creek ; in Europe several genera have been found 

 in the upper Carboniferous of France and Germany. 



