201 

 with elongate subhumeral spot, connected to base, not 



connected to scutellar spot; scutellar spot large, laterally 



concave, both scutellar spots combined to form an X-shaped 



mark; central band with smooth rounded edges, extending 



along suture to apical angle; apical spot reduced to narrow 



margin at apex. Legs entirely black. Antenna club broad, 



antennomere X often with width = 2 x length. Genitalia 



dissected: 6 males, 1 female. 



Variation . Ischyrus quadripunctatus chiasticus shows 

 some variation in the overall width of the markings, but not 

 enough to change the appearance of the color pattern. The 

 apical elytral spot can be a smooth black marking or a thin, 

 sharply angled spot. 



Type . The holotype (original designation) of Ischyrus 

 chiasticus Boyle label data: "/ Patagonia Ariz. 7-36, 

 E.S.Ross/ [red paper, black border] HOLOTYPE Ischyrus 

 chiasticus Boyle/" [CASC, type # 8370, studied] . Sex male. 



Specimens examined . The holotype and 372 specimens, 

 representing 186 collection records, were studied (see 

 Appendix C for specific data) . 



Distribution . This subspecies is found from the state 

 of Morelos, Mexico, north and west of the Sierra Madre 

 Occidental mountain range to southern Arizona (Fig. 113). 



Etymology . chiastos: Greek = cross-wise, X-shape; 

 referring to the X-shaped scutellar spot on the elytra. 



