Packard.] THE POPULATION OF AN APPLE TPEE. 169 



tracks becoming broader as the worm has increased in size." 

 The beetle appears late in August in New York. It is a 

 brown beetle, its wing-covers prickly, whence the name Lep- 

 tostyhis acuh'fenis, and with a white, curA'ed or V-sliaped 

 band behind the middle of the wing-covers, and a black streak 

 on their hind edge. It is about a third of an inch long. 



The Apple LeiojJus (Fig. 134) is a new comer in our or- 

 chards, having lately been found in all its stages of growth 

 Fig. 134. Fig. 135. 



Apple Leiopus. Leiopus of Prickly Ash. 



in the rotten limbs. The grub is so closely allied to that 

 of another species, Leiopus xanthoxyli (Fig. 135, beetle ; 

 13G, a, larva ; h, head yiq. i30. 



seen from above ; and 

 c, seen from beneath), 

 that a wood-cut draw- 

 ing will answer for both. 

 It differs mainly in hav- 

 ing a smaller head and 

 a slenderer body. It 

 seems from what little 

 we know of the hal)its 

 of these insects that' 



there is probably but Larva of Leiopus xantl.oxyli. 



one brood of beetles a 3'car, and that they fly about and lay 

 their eggs on the bark of the tree late in June, and probably 



9 



