262 



Prof. J. Wood-Mason on the jnesence 



the possibility of which anyone may easily convince him- 

 self who will glance at the antennae of 7. capensis, ^, first, 

 from above, shifting his gaze from side to side, so as to get 

 a sight of the outer edges of the teeth, when the organs will 

 appear to be bipectinated, but to have the two apparent 

 rows of pectinations subparallel with one another instead 

 of widely divergent at their free ends as in the truly 

 bipectinated group ; and then directly from the side, when 

 they will appear to have but one row of teeth. The teeth 

 are in fact alternately straight {a) and curved at the base {h), 

 the latter forming the apparent inner, and the former the 

 outer, row of teeth. 



The accompanying diagrams, drawn by the aid of the 

 camera lucida, exhibit the two different forms of male 

 antennae. 



Fig. la. 



Fig. 1. 



Fiff. 2. 



Fig. la. Five con- 

 secutive joints of left 

 antenna of /. capen- 

 sis, $ , viewed isome- 

 trically. 



Fig. 1. Two consecu- 

 tive joints of left an- 

 tenna of Idolomorpha 

 capensis, $ , seen from 

 the end. 



Fig. 2. A single joint 

 of right antenna of Gon- 

 gylus gongylodes, $, 

 seen from the end. 



