1905.] 



NATURAL SCIENCES OF PHILADELPHIA. 



415 



Bhionoderma hutaile n. sp. 



Type; 9 ; Tarbaca, Costa Rica. December, 1902. (C. F. Under- 

 wood.) [A. N. S. Phila.] 



Fig. 1.5. — Rhicnoderma humile n. sp. Lateral view of type. 



Allied to R. olivaceum from Chiriqui, but differing in the very low and 

 weak median carina of the pronotum, the partially sulcate frontal 

 costa and some color details. 



Form subcylindrical, flattened ventrad ; surface of the head, thoracic 

 and basal abdominal segments regularly rugulose, smoother on the 

 abdomen and ventral surface; limbs and ventral surface supplied with 

 rather long, soft hairs, which are most numerous on the caudal tibiae. 

 Head flattened transversely, but little deeper than broad; occiput 

 and vertex gently rounded; fastigium depressed, declivent, longitudi- 

 nally excavated mesad, separated from the face by a low carina; inter- 

 ocular space considerably wider than the width of the eye; frontal 

 costa considerably excavated, intersected by a transverse carina be- 

 tween the bases of the antennae, about which is an 

 oblong enclosed space, below constricted from the 

 width of the dorsal section to half the same width, 

 ventrad failing to reach the clypeal suture; supple- 

 mentary facial carina? distinct ; clypeus considerably 

 inflated ; eyes elliptically ovate, distinctly longer than 

 the infra-ocular portion of the genae ; antennae about 

 equal to the head and pronotum in length, filiform. 

 Pronotum short ; cephalic margin slightly rounded 

 with a distinct median emargination, which forms 

 two blunt points on each side of the median line ; 

 caudal margin subtruncate; median carina very 

 slightly marked and more noticeable, by the 

 absence of rugosities than any distinct eleva- 



Fig. 16.— Rhic- 

 noderma humile n. 

 sp. Cephalic view 

 of head. 



