98 



IX.JURIOrS IXSECTS 



especially the Horse-nettle [S'jianum Carolinense), a very 

 common weed tlirougliout the Middle and Southern 

 States. Both the larva and mature insect of this Bogus 

 Potato-heetle resemble the genuine: but ujion a close 

 examination, a very marked difference may be discovered. 

 The most prominent distinctive characteristics observed 

 in the nearly mature larvae are as follovrs: In the true or 

 D. 1(}-Jineata the sides are ornamented with tvo rows of 

 black dots, and the head is black: while in j unci a there 

 is but one row of dots, and the head is of a pale color: 

 the first joint behind the head is reddish-brown and edged 

 with black. The matui'e insects dilier still more widely, 



Fig. 66.— BOGUS coLORAi>o BEETLE {Dorijphora junctd). 



a, a, Eggs ; &, &. Larvse ; c. Beetle, natural size ; d. Left Wing-coTer, enlarged. 



for while 104ineata, as the name indicates, has ten black 

 strij)es on its elytra, the third and fourth stripe counting 

 from the outside, are joined behind: in junda. the 

 second and third are joined, and in a large proportion 

 the two stripes are united the entire length, hy deep 

 brown, or black, thus forming one broad and conspicuous 

 stripe. There are also other distinctive characters, shown 

 in the accompanying figures, such as the arrangements 

 of the punctures bordering the stripes on the elytra, but 

 these are less conspicuous to the casual observer. 



A few years since I tried to rear a quantity of the 

 larva? sent me from the South on the leaves of the Potato, 

 but failed to cany a single specimen tliroughto maturity 



