113 

 flagellum straight, sclerite at base elongate, claw-shaped, 



almost ring-like (Fig. 88b-d) (3 dissected). 



Female genitalia with spermathecal head elongate 

 kidney-shaped; tail narrow, looped or coiled on itself (Fig. 

 88e) (4 dissected) . 



Presence of stridulatory files on occipital region of 

 head unknown (heads retracted) . Females with foveate 

 punctures on prosternum in front of procoxae; males lacking 

 these punctures, or at most, with a few punctures near 

 procoxae . 



Variation . Ischyrus chacojae color pattern is 

 variable, and the specimens studied may encompass several 

 taxa. No differences, outside of color pattern, were found 

 that would support their separation. More specimens are 

 needed to make any confident conclusion, especially with the 

 South American varieties where only female specimens were 

 studied. 



Mexican specimens and the Guatemalan holotype (Fig. 68) 

 have black heads, often with an orange spot on frons; base 

 of pronotum lacking black spots; subhumeral and scutellar 

 spots broadly connected, not reaching lateral margin; 

 central elytral spot free; suture finely margined black. 



Panamanian specimens have black head with orange 

 epistome; base of pronotum without spots; subhumeral and 

 scutellar spots narrowly connected at base, nearly free from 

 each other, not reaching lateral margin; central elytral 

 spot free; suture finely margined with black. 



