207 

 Stridulatory files on occipital region of head present 



in male; weak or absent in female. No easily visible sexual 



dimorphism was found. 



Variation . A few specimens from northern South America 

 appear to have entirely black legs. These could be soiled. 



The majority of specimens studied have orange marks on 

 the head. The orange spots are variable in size and can be 

 absent, leaving the head entirely black. The size variation 

 does not correlate with any other observed character. Some 

 populations are variable, with both black and spotted heads. 



The elytral markings are variable in the degree of 

 jaggedness. Some specimens have the markings smoothly 

 rounded; some have the markings jaggedly cut, tooth-like; 

 and others have the markings narrowed to a zig-zag line. 

 This variability appears clinal, with the smoothly banded 

 populations in the northern part of the range and the 

 jaggedly edged populations in the southern parts of the 

 range. Populations in the southern part of the range also 

 have the basal elytral marking broken by a number of pale 

 spots . 



The size of the pronotal spots varied greatly through 

 the geographic range. On occasion, the anterior and basal 

 spots are broadly joined to the margins. Most specimens 

 have these spots constricted at the margin and, at most, 

 simply touch the margin. A few specimens have the spots 

 free . 



