64 

 function is not known, but they could be used for structural 



support, muscle attachment, areas for glandular secretion, 



or mycangia (Crowson 1981) . 



Etymology . Ischyros: Greek for strong, mighty, 

 excessive (Brown 1985) . Possibly named in reference to the 

 strongly clubbed antennae or pronounced color patterns. 

 Gemminger and Harold (1876) indicated that the name Ischyrus 

 means "validus". 



Remarks . Although Boyle (1956:110) stated that 

 Ischyrus lacks teeth on the lacinia; this is incorrect. The 

 tooth illustrated (Fig. 19) is located in a dense patch of 

 setae and is difficult to see. 



Ischyrus Lacordaire appears most closely related to 

 Megischyrus Crotch, Callischyrus Crotch, and Oocyanus Hope 

 in having a triangular mentum, loose antennal club, 

 strongly microreticulate body surface, and in basic color 

 patterns. 



Ischyrus differs from Oocyanus in having the femora 

 margined along the inner side where the tibiae meet the 

 femora (Fig. 21a); this margin is lacking in Oocyanus (Fig. 

 21b) . Callischyrus differs from Ischyrus in having the eyes 

 finely faceted and the ocular stria surpassing the antennal 

 base; in Ischyrus the eyes are coarsely faceted and the 

 ocular stria at most touch the antennal base. Megischyrus 

 differs from Ischyrus in having a larger body size (greater 

 than 11 mm) and in having antennomere IX triangular (Figs. 

 6n-o) ; in Ischyrus the body size is smaller (less than 10 



