301 

 Presence of stridulatory files on occipital region of 



head unknown (heads retracted) . Males with prosternum 



slightly expanded onto pronotal epipleuron, reaching 0.33 



distance from prosternal-pronotal epipleuron suture to 



lateral edge; females with suture in front of coxae obscured 



for half distance to anterior margin, not expanded. Females 



with a few foveate punctures on prosternum in front of 



procoxae, weakly impressed, obscure; males lack these 



punctures . 



Variation . The Brazilian specimen has the prosternum 

 swollen above the pinch, and a red epistome. All other 

 specimens studied have the prosternum weakly developed and 

 the head entirely black. Only the Venezuelan specimen has 

 the subhumeral spot large and touching the scutellar spot. 

 The subhumeral spot is free on the remaining specimens. 



Specimens examined . A total of 12 specimens, 

 representing 11 collection records, was studied (see 

 Appendix C for specific data) . 



Distribution . Southern Central America and northern 

 South America (Fig. 147) . 



Remarks . Ischyrus n. sp . 15 superficially resembles I. 

 tripunctatus . Ischyrus tripunctatus lacks pronotal basal 

 spots and has the central pronotal spot free; I. n. sp. 15 

 has pronotal basal spots and the central spot is narrowly 

 connected to the anterior margin. 



