v PHYTOPHAGA CHRYSOMELIDAE . 279 



Prothorax much narrower at the base than the elytra, and usually with- 

 out side-margins (raised edges). Sub-fain. 1. EUPODA ; with three divisions, 

 Sagrides, Donaciides, Criocerides. 



The basal ventral plates of the abdominal segments are somewhat shorter 

 in tlie middle than at the sides, the fourth one being often invisible in the 

 middle, while the fifth is very large. Sub-fam. 2. CAMPTOSOJIES ; with six 

 divisions, Megascelides, Megalopides, Clythrides,.Cryptocephalides, Chlamydes, 

 Sphaerocarides. 



In the other two groups there is no great disparity between the fourth 

 and fifth ventral plates. 



Prothorax not greatly narrower at the base than the elytra, and usually 

 with distinct edges at the outsides. Sub-fam. 3. CYCLICA ; with four divi- 

 sions, Lainprosomides, Eumolpides, Chrysomelides, Galerucides. 



Front of the head bent downwards or inflexed, so that the mouth is on 

 the lower aspect. Antennae inserted close together on the most anterior 

 I'-ul of the head, so that they are more forward than the mouth. Sub-fam. 

 4. CRYPTOSTOMES ; with two divisions Hispides, Cassidides. 



In the other three divisions the mouth is placed as usual, but the insertion 

 <pf the antennae varies a good deal. 



The larvae of about 100 species of the family are known: 

 they are arranged in accordance with their habits, by Chapuis, 1 

 in six groups, viz. : 



1. Elongate larvae, living under water, and there undergoing their meta- 

 morphosis. (Donaciides.) 



2. Larvae mining in leaves, and undergoing their metamorphosis in the 

 leaf. (Hispides and some Halticide-. 



3. Short convex larvae, frequently with leathery and pigmented integuments, 



living exposed on plants. (Most of the Cyclica.) 



4. Larvae of short form ; covering the body with excrementitious matter. 



(Some Criocerides.) 

 o. Peculiar larvae of short form, spiny, and protecting their bodies by 



excrementitious matter attached by a special apparatus, the excrement 



itself being modified so as to be suitable for retention. (Cassidides.) 

 6. Elongate, pallid, -larvae with curved abdomen ; living in shell-like case.-, 



and undergoing metamorphosis therein. (Most of the Camptosomes, 



the habits of which are known.) 



Though our knowledge of these larvae extends to only about 

 100 out of 18,000 species, the above category by no means 

 includes all the kinds of larvae ; Captain Xambeu having 

 recently discovered that, the larva of Chrysochus pretiosus HVQS in 

 the earth feeding on roots after the manner of a Rhizotroyn* 

 larva, which it resembles. The larva uf Xnym splcndida lives 



Genera dcs CoUopteres (Suites 7>'////'n/(). x. Paris. 1874, p. 15. 



