550 INSECTA. 



gicornes in the number and double insertion of the vessels 

 which compose it ; they amount to six, two of which, those 

 of the CassidjE excepted, are generally slenderer and shorter. 

 Each testis is formed by a single capsule. 



All the larvjB known to us are furnished with six feet, 

 have a soft, coloured body, and feed, as well as the perfect 

 Insect, on the leaves of vegetables to which they usually 

 attach themselves by means of a viscid or adhesive humour. 

 There also many of them become nymphs, at the posterior 

 extremity of which is found the last exuvitje of the larva folded 

 into a pellet. These chrysalides are frequently of various 

 colours. Some of the larvae penetrate into the earth. 



These Insects are generally small, and are frequently orna- 

 mented with brilliant and metallic colours ; their body is 

 smooth or destitute of hairs. They are mostly slow and timid, 

 letting themselves fall to the ground the moment we attempt 

 to seize them, or folding their antennai and feet close to their 

 body. Several species are good jumpers. The females are 

 extremely prolific. 



If we take into consideration the different habits of their 

 larvae, we will find that the Cyclica are divided into four 

 principal sections: 



1. Larvae covering their bodies with their excrement. 



2. Larvae inhabiting tubes which they drag about with 

 them. 



3. Naked larvae. 



4. Larvae concealed in the interior of leaves, and feeding 

 on their parenchyma : the Leaping Cyclica. 



Such are the principles on which we have proceeded in 

 the arrangement of this family. We divide it into three 

 tribes, according to the mode in which the antennae are in- 

 serted. 



In the first, or the Cassidari.^, the antennae are inserted 

 in the superior part of the head, and are approximated, 

 straight, short, filiform and almost cylindrical, or gradually 

 enlarged towards the extremity. The mouth, altogether un- 

 derneath, and with short and almost filiform palpi, is some- 



