52 



numbered, because of problems with nomeclatural priority, 



and names will be proposed when published. 



The lack of series in many species indicates that 

 there is much to be discovered in this genus. Several of 

 the species discussed here may actually represent 

 complexes. Because of inadequate material these problem 

 taxa are left unresolved and are discussed under the 

 appropriate species account. 

 Results 



The genus Ischyrus is composed of 42 North and Central 

 American species, including 16 previously undescribed; 

 leaving 30 additional described species in South America. 

 A total of 3741 North and Central American specimens was 

 studied (2890 I. quadripunctatus) and 363 were dissected. 

 The 148 figures, key, appendices, and descriptions are 

 provided to complete this revision. 



