BY THOMAS G. SLOANE. 363 



Genus Carenu m. 



Seven years ago I attempted to arrange the species of the 

 central genus Carenum into groups as an aid in the identification 

 of species, at the same time enumerating the species that I believed 

 to belong to each group.* Further knowledge shows me that 

 the system of groups then adopted was faulty, and that a number 

 of species were referred to groups which were not their natural 

 place. I now offer a new arrangement of the species into groups, 

 following the lines of my former classification, but presenting 

 alterations where such have been necessary to bring the tabu- 

 lation more into accord with what seems to me a natural system, 

 the chief alteration being the removal of the C. anthracinnm 

 group from Division " ii."' to Division " i." 



The plan of using the names of species for distinguishing groups 

 of species in large genera seems to me decidedly better than using 

 numbers. It allows for the interpolation of new groups in their 

 natural position, if requh'ed, without altering the designation of 

 every subsequent group, as would be necessary with a numeral 

 system; it also permits of a different arrangement of the groups 

 without causing any confusion if subsequent research shows that 

 the first oi'der adopted is not the most natural; in the case of 

 numbered groups a rearrangement may alter the number of several 

 of the groups, with the result that all subsequent references must 

 state which system of groups is meant. The species first described 

 should always be used as the name-species of a group. 



Table of Groups in the Genu* Carenum. 



I. Penultimate joint of labial palpi not swollen 

 towards apex (usually narrow and longer than 

 apical joint). Suborbital antennal scrobes 

 straight, single. Infiexed margin of elytra 

 wide behind first ventral segment. 



P.L.S.N.S.W. 1893, viii. (2), pp. 402-465. 



