7 

 division, crediting Lacordaire as the first describer of 



the genus, and designated Erotylus quadripunctatus Olivier 



as the type species. This was accepted and used by all 



subsequent workers until Alvarenga (1965) found some errors 



in the type designations and credits for these genera. 



According to the current International Code of 



Zoological Nomenclature (1985) the first valid use of a 



name is to be followed—the Law of Priority. Before 1931, 



the first use of a generic name is valid if it is followed 



by a description or has a valid species name listed under 



it, an indication. Also, in designating a type species for 



a genus subsequent to its first use, the reviser 



designating the type must choose a species from those 



originally included within the genus (as indicated by 



Barber & Bidwell 1940) . This makes the Dejean catalogs 



(1836, 1837) the first valid uses of the generic name 

 Ischyrus, and the type species should have been chosen from 

 the species listed within it. 



According to these rules, Crotch (1873b) had 

 incorrectly chosen the type species of Ischyrus, because 

 Erotylus quadripunctatus was not listed in Dejean (1836) as 

 Ischyrus . Erotylus undatus Olivier was listed under the 

 name Ischyrus Chevrolat in Dejean (1836) . Crotch chose 

 Erotylus undatus as the type species of his genus 

 Megischyrus . This makes Megischyrus Crotch an objective 

 synonym of Ischyrus Chevrolat, leaving Ischyrus Lacordaire 



(sensu Crotch) without a valid name. 



