166 THE ORDER OF COLEOPTERA. 



is scarcely bilobed, and tlie claws are usually simi)le. In the latter, the 

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

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

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

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



The larvfe live exposed on the leaves of herbac;jous 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 

 Blepharida, which we have preferred to unite with the other saltatory 

 species. 



The following are the genera of Clirysomelini : 



A. Third joint of tarsi entire or slightly notched at the end ; posterior episterna usaally narrowed 

 behind. 

 B. Form regularly oval and strongly convex ; tarsi entire ; color usually yellow, with di^rker stripea 



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



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 GAfeTROPii ysa. 



BBB. Form short and round or subglobuse; dark metallic without spots; length much less than 



quarter of an inch Ph^DON. 



B B B B. Form oblong, narrow, parallel, depressed ; antennsB 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 ; 

 coiors various; size same as Chrysomela Plagiodeka. 



The following are the genera of Eumolpini : 



A. Body smooth and shining. 

 B. Thorax lobed behind the eyes. 

 C. Elytra irregularly punctured ; claws with a tooth beneath. 

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



more Chrysochus. 



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



less Tyi'OI'HOKUS. 



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 antennse shorter than the third ; elytra densely but irregularly piinc- 



tate CoLAsris. 



E E. Second and third joints of antenn.e equal ; elytra punctured in rows Metachroma. 



A A. Body more or less clothed with hair or scales. 

 F. Thorax without a margin at the sides. 

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

 G 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 Xanthonia. 



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

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

 follows : Labido7nera, Chevr., dark-yellow, with a few large blue-black 

 spots ; Mi/ocoryna, Stal., usually with the elytra pale-yellow, with four 

 or five darker stripes on each ; Zi/f/ofjramma, Chevr., elytra with two or 

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

 numerous irregular lines and dots; and (7/tr^.some/a, Linn., blackish or 

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



