94 INJURIOUS INSECTS 



towards the latter end of June, and the second in August. 

 The first brood stays underground about a fortnight 

 before it emerges in the perfect beetle state; and the 

 second brood stays there all winter, and only emerges at 

 the beginning of the following June. The perfect Beetle 

 (fig. 64,) is of a pale yellow color, with three black 

 stripes on its back, and bears a general resemblance to 

 the common Cucumber-bug (Dictbrotica vittata, Fabr., 

 see fig. 27, p. 42). From this last species, however, it 

 may be readily distinguished by the remarkable pinching 

 in of the sides of its thorax, so as to make 

 quite a lady-like waist there, or what nat- 

 uralists call a " constriction." It is also 

 on the average a somewhat larger insect, 

 and differs in other less obvious respects. 

 As in the case of the Colorado Potato-bug, 

 the female, after coupling in the usual man- 

 ner, lays her yellow eggs (fig. 63, d,) on 

 the under surface of the leaves of the 

 potato plant. The larvae hatching from these require 

 about the same time to develop, and when full grown, 

 descend in the same manner into the ground, where they 

 transform to pupae (fig. 63, c,) within a small oval 

 chamber, from which in time the perfect beetle comes 

 forth. The remedies for the Colorado Beetle should be 

 used for this. 



THE COLORADO POTATO-BEETLE. 



(Doryphora 10-lineata, Say.) 



RETROSPECTIVE. 



In 1819 the United States Government fitted out an 

 exploring expedition to the Northwest Territories under 

 the command of Major Stephen H. Long. The zoologist 

 of this expedition was Mr. Thomas Say, of Philadelphia, 



