1906. 



NATURAL SCIENCES OF PHILADELPHIA. 



37 



distinct with a broad sublunate intermarginal depression, no median 

 carina present, fastigium when viewed laterad moderately decUvent: 



-Isonyx paraguayensis n. gen. and sp. 

 female type. (X 3.) 



Lateral view of 



dorsal section of the face vertical, ventrad of the antennae consider- 

 ably (c?) or gently (9) retreating; lateral foveolse distinct, cephalic 

 well impressed and excavated, sublanceolate; frontal costa strongly 

 compressed dorsad, regularly expanding ventrad of the antennae to the 

 clypeus, with an additional rotundate expansion at the ocellus, sHghtly 

 sulcate ventrad of the ocellus; eyes subovate in the male, subovoid in 

 the female, flattened cephalad in the latter sex, moderately prominent 



Fig. 12. — Isonyx paraguayensis n. gen. 

 and sp. Dosal \'iew of head and 

 pronotum of female type. (X 3.) 



Fig. 13. — Isonyx paraguayensis'n. gen. 

 and sp. Lateral view of abdomen 

 of male type, (x 6.) 



in the male when viewed dorsad ; antennse subequal to the head and 

 pronotum in length in the male, slightly shorter in the female, Pro- 

 notum deplanate dorsad, the greatest caudal width contained about 

 once and a quarter in the length; cephalic margin subtruncate, caudal 



