CHRYSOMELIDiE. 



505 



live on the upper surface of the leaves and devour the cuticle 

 and parenchyma above, leaving the lower cuticle untouched. 

 It is of a dirty yellowish white color, with black tubercles 

 bearing white bristles. Length one-fourth of an inch." (Har- 

 ris Correspondence, p. 267.) 



We have found Galeruca marginella Kirby (Fig. 498 ; a, 

 larva ; &, pupa) in all its stages of growth on Myrica gale, 

 during the middle of August, 

 in Northern JNIaine. Tlie 

 larva is shining black, coria- 

 ceous above, and the body 

 is elongated, flattened, with 

 a small orbicular black head. 

 The upper side of the body 

 is hard, from the close prox- 

 imity of the black flattened 

 tubercles. Beneath, whitish ; on the side is a row of small 

 black brown tubercles, and along the middle of the body is a 

 row of transversely linear brown tu- 

 bercles, on each side of which is a 

 minute dot-like tubercle. It is not 

 hairy, and measures .25 of an inch in 

 length. When about to transform it 

 fastens itself by its tail to the surface 

 of a leaf. The pupa is brown-black. 

 The beetle is umber brown, testaceous 

 on the edges of the elytra, the legs being also testaceous, 

 while the prothorax is pale, with three dark broAvn spots, 

 of which the central one is T-shaped. 



The Striped Squash beetle, Didbrotica 

 vittata Fabr. (Fig. 499, a, larva ; &, pupa 

 seen from underneath; Fig. 500, adult) ap- 

 pears on squash vines as soon as they are Fig. 50i. 

 up, and at once devours them unless their attacks are pre- 

 vented. Covering the vines with cotton or a box covered with 

 muslin or millinet is the only sure remedy, while on a large 

 scale powdered charcoal, or lime is used, to be sprinkled on the 

 leaves. Mr. Gregory, says the "American Agriculturist," re- 

 lies upon plaster, or oyster-shell lime, which may be shaken 



Fig. 499. 



