61 

 Sexual dimorphism often present. Males of some species 



have the prosternum laterally expanded onto the pronotal 



epipleuron; not expanded in females (Figs. 13-14). Males of 



many species have fewer, or less distinct, punctures on the 



prosternum in front of the procoxae (Figs. 12-14) . 



Distribution . This genus is restricted to the New 

 World, where it is widespread, occurring from southeastern 

 Canada near the St . Lawrence Seaway and southeastern North 

 Dakota through the eastern U.S. and southern Arizona, 

 Mexico, Central America, the West Indies, into South America 

 to northern Argentina. 



Biology . The life history of this genus is basically 

 unknown. Only one species has its larva described; the type 

 species I. q. quadripunctatus (Olivier) (see Weiss 1920, 

 Skelley 1988b, Chapuis & Candeze 1855, Chapuis 1876) . The 

 following is based on published accounts of this species, a 

 few bits of information taken from label data, and personal 

 communications and observations. 



The larva of I. q. quadripunctatus has well developed 

 dorsal sclerotization with short spines. It is unusual in 

 that the pronotal sclerotized area is broken into parts 

 appearing like false eyes (Fig. 23) . Members of a related 

 genus, Oocyanus Hope, have a similar set of "eye-spots". 

 This peculiarity could be of adaptive significance in 

 warding off predators. Both of these larvae have been found 

 feeding exposed on prostrate white fungus growing on dead 

 wood (personal observations) . Other larvae of the 



