CHRYSOMELID^. 503 



as long as thick, the body thickening posteriorly, and of a 

 dull ash gray or obscure olive, with a black head and legs. 



Leiffia trilineata Olivier (Fig. 494 ; a, larva ; b, terminal joints 

 of abdomen ; c, pupa ; d, eggs) occurs in great abundance 

 on the leaves of the potato. The dirty yellowish larvae are 

 found on it abundantly, and hide themselves by covering their 

 bodies with their own excrement. They mature in about two 

 weeks, transform in earthen cells cemented with a gummy 

 exudation discharged from the mouth, and in a fortnight, 

 being about the first of August, the beautiful yellow and black 

 striped beetle, with a reddish head and prothorax, appears. 



Hispa is also a miner in the larva state. Hispa (Uroplata). 

 7'osea Harris (Fig. 495) is supposed by Harris to mine the 

 leaves of the apple tree. Harris describes it as being "of a 

 deep or a tawny reddish yellow color above, 

 marked with little deep red lines and spots. 

 There are three smooth, longitudinal ribs on each 

 elytron, spotted with blood-red, and the space 

 between these lines are deeply punctured in 

 double rows ; the under side of the body is black, 

 and the legs are short and reddish. They meas- rig. 495. 

 m'e about one-fifth of an inch in length." "The larvae burrow 

 under the skin of the leaves of plants, and eat the pulpy 

 substance within, so that the skin over and under the place 

 of their operations, tiu'ns brown and dies, having somewhat 

 of a blistered appearance, and within these blistered spots 

 the larvse or grubs, the pupas or the beetles, may often be 

 found. The eggs of these insects are little rough, blackish 

 grains, and are glued to the surface of the leaves, sometimes 

 singly, and sometimes in clusters of four or five together. The 

 grubs of our common species are about one-fifth of an inch in 

 length, when fully grown. The body is oblong, flattened, rather 

 broader before than behind, soft, and of a whitish color, ex- 

 cept the head and the top of the first ring, which are brown, 

 or blackish, and of a horny consistence. It has a pair of legs 

 to each of the first three rings ; the other rings are provided 

 with small fieshy warts at the sides, and transverse rows of 

 little rasp-like points above and beneath. The pupa state lasts 

 only about one week, soon after which the beetles come out of 



