Vicinity of Mazon Creek, Illinois. 



317 



directed toward the costa. Sector rising at about a quarter 

 of the length, widely diverging and giving off about 9 very 

 regular branches, the first of which is forked. Media cleft 

 into 2 main branches, the anterior of which closely approaches 

 the sector. Each of these main branches splits into 3 twigs. 

 Cubitus cleft immediately after the origin, its long anterior 

 branch touching for a moment the media and then splitting 



Fig. 22. 



' *, 



Fig. 22. Gerarulus radialis. x 2 - 2. 



into 2 twigs, the posterior branch forming a long fork. First 

 anal vein sinuated, with 2 twigs directed backward. In addi- 

 tion, there are ? 3 short and simple anal veins to be seen. 



In the posterior wing the radius is ramified in a similar man- 

 ner to that in the front wing. The sector i-ises very near the 

 base, does not diverge so far and gives off its branches much 

 nearer the base. Media cleft very near the base into 2 rami- 

 fied branches. Cubitus with a simple anterior branch approach- 

 ing the media and with a waved posterior branch splitting into 

 a few twigs. Anal veins simple and straight. 



Holotype in Peabody Museum, Yale University, Cat. No. 37. 



Anepitedius, new genus. 



The following species, which I consider the type of this new 

 genus, is likewise very closely related to Gerarus and shows a 

 slender peai'-shaped prothorax, forming a long neck. The 

 long wings, with a strongly shortened subcosta, meeting with 

 the costa. The radius in its apical portion sends forth some 

 ramified S-shaped branches, directed forward. The sector 

 rises near the base and apparently gives off but a few branches. 



