2 MEMOIRS ON THE COLEOPTERA 



the Geniatids. The tribes, so far as they concern the North 

 American fauna, are arranged by Lacordaire as follows: 



Labrum oblique, thin, not prolonged but generally sinuate medially. .2 

 Labrum large, vertical, more or less prolonged medially, generally 



abutting against the ligula 3 



2 Elytra with a membranous border; antennae always 9-jointed. 



ANOMALINI 

 Elytra without a membranous border; anterior coxae transverse and 



deep-set RUTELINI 



3 Tarsi simple *ANOPLOGNATHINI 



Tarsi dilated at least in the males *GENIATINI 



Only the first two of these tribes occur north of the Mexican 

 boundary. The Geniatini are almost confined to South America, 

 though a few occur in Central America; the body is more elongate 

 and with much greater cephalic development than in the Anomalini 

 and the larger claw of all three pairs of tarsi is cleft in a very large 

 proportion of the species. 



Tribe ANOMALINI. 



This important section of the Rutelinae is composed of very 

 numerous species, assignable to many genera and widely distributed 

 over the greater part of the earth in both high and low latitudes. 

 The genus Anomala, as enlarged by Burmeister and Lacordaire, 

 contains many discordant elements and has more the nature of a 

 supergenus or subtribe than a true genus, the latter being properly 

 a group of species rigidly limited by special and restricted structural 

 characters, assuming, at any rate, the absence of real intergrades, 

 which seems to be the condition characterizing most of the subordi- 

 nated groups. Habitus is an important character in estimating 

 the limits of such groups of species. Furthermore in the present 

 case it is necessary either to recognize a number of distinct genera, 

 of which Euchlora is one of the more conspicuous, or to give the 

 latter name to the entire group, for it antedates Anomala in point 

 of time and therefore, in justice, ought not to have been made to 

 give way to the latter. I much prefer the former course. 



The greater part of the Anomalini are small or moderate non- 

 metallic forms, with rather thin integuments, but there are some large 

 and densely chitinized species of brilliant coloration, such as the 

 Chinese Euchlora viridis Fabr., which rival the conspicuous typical 



