234 



AN ECONOMIC ENTOMOLOGY. 



This is one of those cases where persistent and universal practice 

 is desirable to obtain the best results. 



An allied but larger species of the same genus without the 

 elevations on the wing-covers is C. crataegi, which attacks the 

 quince and sometimes does considerable injury, much as the C. 

 iiemiphar does on the fruits above enumerated. The same 

 measures are indicated here also. 



The potato-stalk borer, Trichobaris j-notata, is a small ash- 

 gray weevil about one-sixth of an inch in length, with a black 



Fig. 241. 



Potato-stalk borer, T^-ichobaris trinotata. — Larva, pupa, and adult. 



snout and three small black spots at the base of the wing-covers. 

 It lays its eggs into the stems and larger branches of the potato, 

 horse-nettle, Jimpson-v/eed (^Datura stramonhmi) , and, perhaps, 

 other Solanaceae, and the white larvae feed there until after mid- 

 summer, changing to pupae at about the time when the potato- 

 vines mature, and to adult beetles a short time thereafter. The 

 beetles remain in their larval burrows during the winter, and may 

 be easily destroyed by burning the vines immediately after the 

 potatoes are harvested. 



The species of Balmiinus are known as nut-weevils, are of 

 quite large size, clay-yellow in color, and with an exceedingly 

 long and slender, black beak or snout. By means of this they 

 puncture the burrs of young chestnuts, the husks of hickory and 

 walnuts, and the green coverings of young acorns, reaching near 

 the centre of the nut itself, and placing an egg in the hole so 



