Vicinity of Mason CreeJc, Illinois. 315 



Fig. 20. 



Pu 



jM a* 



Fig. 20. Gerarus reductus (negative of right fore wing), x 2 - 2. 



united to the media by an S-shaped twig. The cross veins are 

 straight between snbcosta, radius and sector, waved and some- 

 times ramified in the medial and cubital region. 



Holotype in Peabody Museum, Yale University, Cat. No. 35. 



Gerarus longicollis, new species. Fig. 21. 



Prothorax 14 mm in length, provided in the basal part with 

 2 lateral tubercles and with another situated in the middle 

 of the hind margin ; the neck -like slender anterior portion 

 of the prothorax conspicuously thin and long. Head evidently 

 broader than the neck. Anterior wing 36 mm long. Costal 

 area broad, subcosta extending about two-thirds of the wing. 

 Radius conspicuously far removed from the costa in the apical 

 third. Sector rising at a quarter of the length, first diverg- 

 ing from and then converging with the radius ; of its 4 

 branches the first is forked. Media cleft somewhat below 

 the origin of the sector, its posterior main branch simple, 

 the anterior forked into 2 twigs, the anterior of these uniting 

 for a short distance with the radial sector. Cubitus free, 

 giving rise to probably but 2 branches directed backward. 



The posterior wing being very fragmentary, it is difficult to 

 distinguish media and cubitus, but it is possible to see by the 

 different arrangement of these veins that there was present a 

 large anal lobe. 



Holotype in Peabody Museum, Yale University, Cat. JSTo. 36. 



Geraruxus, new genus. 



Evidently related to Gerarus but distinguished by the 

 strongly expanded apical half of the anterior wing and by the 

 radius being branched before the end. Costa marginal ; sub- 

 costa shortened, united with the costa. The space between the 

 sector and the radius conspicuously enlarged, sector with 



