100 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



PROTORTHOPTERA. 



DANIELSIELLA, new genus. 



Body essentially as in Spaniodera, the mesothorax large, with a 

 considerable portion anterior to insertion of wings; prothorax 

 elongated, though not excessively so; abdomen long; hind legs not 

 fitted for jumping, the femur and tibia like those of Ischnoneura. 

 Wings shaped as in Spaniodera; subcosta not obscured ; radius simple, 

 its apical part hardly separated from costal margin; radial sector 

 very stout, arising far toward base of wing, having two oblique 

 branches above near end, and four branches below, the fourth curved ; 

 media with three verj^ oblique branches below ; cubitus and anals not 

 observed. The above refers to the anterior wing; the radial sector 

 of posterior wing has three branches below, but the last is nearly in a 

 line with the stem, so that the continuation of the latter rather 

 resembles an upper branch. 



DANIELSIELLA PRISCULA, new species. 



Anterior wing about 24 mm. long, of which 20 mm. is preserved ; 

 diameter of mesothorax slightly over 4 mm. ; diameter of prothorax 



near middle about 

 2,25 mm. Body and 

 legs are preserved in- 

 tense black, the mid- 

 dle of the thorax ap- 

 parently paler, with 

 a black band across 

 mesothorax ; wings 

 diskj^, the' radial sec- 

 tor blackened and conspicuous on both wings, the other veins pallid. 

 Mazon Creek, Illinois, in a nodule of Carboniferous (Pennsylvania) 

 age. (L. E. Daniels.) 



H olotype.— Cixt. No. 62000, U.S.N.M. 



The interpretation of the venation has been difficult, and may 

 possibly be erroneous. The media is almost exactly like the cubitus 

 of Dieconeura Tnazona^ as figured by Handlirsch. Below the stem of 

 the radial sector it is possible to detect a very faint line, shown in 

 the figure, which could conceivably represent a more or less rudi- 

 mentary media, essentially as in Gyrophlehla longi-collis Handlirsch. 

 The character of the radial sector, with two very distinct branches 

 above, appears to exclude the insect from Dieconeura and Gyro- 

 phlehla. On the other hand, both radial sector and media present a 

 good deal of resemblance to those of Ischnoneura oustaletl Brong- 

 niart, from the Carboniferous of Commentry ; and a mere simplifica- 

 tion of this type gives us the Permian Liomopterum and Lepium of 



7. — Danielsiell.v triscula. 

 Hind wing. R, Radius. 



