166 THE ORDER OF COLEOPTERA. 



is scarcely bilobed, and the claws are usually simple. In the latter, the 

 thorax is very convex, narrower than the abdomen, and with the mar- 

 gin indistinct or wanting; the antennte are slender, almost filiform, and 

 about half as long as the body ; anterior coxge globose; the third joint 

 of the tarsi is deeply bilobed, and the claws are bifid. 



The larvse live exposed on the leaves of herbaceous plants, upon which 

 they feed. We do not know of any larva in this sub-family which covers 

 itself with excrement, unless we admit into it the intermediate genus 

 BUplmrida^ which we have jDreferred to unite with the other saltatory 

 species. 



The following are the genera of Ghrysomelini : 



A. Tliird .joint of tarsi entire or slightly notclied at the end ; posterior episterna usually nan-owed 

 behind. 

 B. Form regularly oval and strongly convex; tarsi entire; color usually yellow, with darker stripes 



or spots ; length between a quarter and a half of an inch Chkysojiela. 



B B. Form oval or oblong oval, convex ; third joint of tarsi notched ; color metallic-green or blue ; 



length less than quarter of an inch Gastrophysa. 



B BB. Form short and round or sub-globuse; dark metallic without spots; length much less than 



quarter of an inch PHiEDON. 



B B B B. Form oblong, narrow, parallel, depressed ; antennse strongly clavate ; dark metallic, with 



a few yellow stripes ; length much less than quarter of an inch Pkasocuris. 



A A. Third joint of tarsi deeply bilobed ; posterior episterna parallel ; form oblong oval and depressed ; 

 colors various; size same as Chrysomela Plaoiodeba. 



The following are the genera of Eumolpini : 



A. Body smooth and shining. 

 B. Thorax lobed behind the eyes. 

 C. Elj'tra irregularly punctured ; claws with a tooth beneath. 

 D. Antennse robust, somewhat clavate ; color golden-green or blue ; length a third of an inch or 



more Chrysochus. 



D D. Antennse long and filiform ; color golden-green or bronze ; length a quarter of an inch or 



less TYi-oPHORLrs. 



C C. Elytra punctured in rows ; claws bifid ; size small ; color brown with black spots, rarely 



wholly black Paria. 



B B. Thorax not lobed behind the eyes. 



E. Second joint of the antennae shorter than the third ; elytra densely but irregularly punc- 

 tate COLASPIS. 



E E. Second and third joints of antenna? equal ; elytra punctured in rows Metachroma. 



A A. Body more or less clothed « ith hair or scales. 

 F. Thorax without a margin at the sides. 

 tr. Body shining, bronze, rarely green ; punctures indistinct; .sparsely haired.. Heteraspis. 

 U G. Body obscure, brown, coarsely punctured. 



H. Thorax longer than wide ; body densely haired ; size about medium Fidia. 



H H. Thorax wider than long ; body moderately haired ; size small Xaxthonia. 



The genus Chrysomela has been divided into a number of sub-genera 

 which can generally be distinguished by their style of coloration, as 

 follows : Labidomera, Chevr., dark-yellow, with a few large blue-black 

 spots ; Myocoryna, Stiil., usually with the elytra pale-yellow, with four 

 or five darker stripes on each ; Zygo(jmmma, Chevr., elytra with two or 

 three stripes more or less united ; CalUgrapha, Chevr., elytra with 

 numerous irregular lines and dots ; and Chrysomela^ Linn., blackish or 

 golden, without stripes; but there are some exceptions to these general 



