1838. HOUSE— No. 72. 97 



second brood, which appears towards the end of sumnner, remain 

 without change, till the ensuing spring, and then become perfect in- 

 sects. Thus, in every year, there are two broods, the larvse from 

 which, when numerous, often do considerable injury to vegetation. 



Crioceris trilineata is found on the leaves of the potato-vine. 

 The parent insects, which have survived the winter in the pupa 

 state, make their appearance early in June. The eggs are oblong 

 oval, and of a yellow color, and are fixed on the leaves by a glutin- 

 ous substance, which cements them securely in packets of six or 

 eight in number. The larvaB soon appear, and begin their depreda- 

 tions. Their numbers are sometimes immense, and the leaves are 

 then covered and nearly consumed by these filthy grubs. After 

 they have passed through their metamorphoses, which are such as 

 were stated in the account of the genus, the perfect insects again ap- 

 pear. This occurs during the month of July, and the eggs for the 

 second brood are then deposited, from which a continuation of the 

 species in the following year, is secured, the larvae entering the earth 

 before antumn, and the pupa:; remaining quiescent till spring. 



The insects belonging to the family of Cassidadce have the feet 

 spongy beneath as in the three preceding families ; but the eyes are 

 oval ; the antennae are short, and situated near each other at a dis- 

 tance from the mouth, or between the eyes ; the nails are simple at 

 the points, and not much curved. 



In the genus Hispa, the antennae are very short, and are thickened 

 towards the ends ; the thorax is trapezoidal, its anterior edge being 

 the shortest ; and the body is rough or spinous. The habits of this 

 genus are very peculiar, and no account has as yet been given of them 

 by any European naturalist. The perfect insect is found in the spring 

 on the leaves of trees. It deposits from one to four or five eggs 

 on the upper surface of the leaf. The larva, when hatched, pene- 

 trates under the cuticle and devours the parenchyma or pulpy part 

 of the leaf, so that the cuticle over its retreat turns brown and dies. 

 The larvEe of those species which are known to me are about one- 

 fifth of an inch in length, when fully grown. The body is oblong, 

 flattened very much, rather broader before than behind, of a whitish 

 color, except the head and first segment, which are of a darker color 

 and horny consistence. It has three pairs of feet, and the segments 



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