12:5 



only tends to free them from dust, but also assists in driving away the 

 injurious insects. If they have obtained a lodgement, they must be 

 hunted out and killed, or the books must be spread and placed in a 

 vessel where they can be fumugated with something that will destroy 

 the larvae. 



Spec, char Imago.— Antennae simple, filiform, having the three ter- 

 minal joints elongate. Ovate, ferruginous; slightly pubescent; eye- 

 black. * Thorax convex, width behind about equal to the elytra, nar- 

 rowed in front ; equally and finely punctured, a median line usually 

 distinct, and a narrow fovea or impressed line each side near the hind 

 margin. filvtra convex, outer margins parallel over half their 

 length, then regularly rounded to the apex; clothed with an evident 

 pubescence, delicately striated, the striae composed of minute punc- 

 tures, the interstices flat and finely rugulose. Antennae and legs- 

 rusty-red. 



Length from one-tenth to one-eighth of an inch. 



Bostrichus (Amphicerus) bicaudatus.— Say. 



The group to which this belongs is distinguished by the oblong: 

 cylindrical body, the thorax being about as broad as the elytra ; both 

 extremities blunt, the head being hid beneath the blunt rounded 

 thorax which extends forward so as to cover the former. Ihe anten- 

 nae are rather short and terminated by three enlarged joints. 1 he 

 grubs are white, fleshy, furnished with six feet, wrinkled on the back 

 and similar to the preceding. They are generally a little the largest 

 in front, tapering slightly and gradually posteriorly, and coiled in a 

 semi-circular form. 



This-species is of a reddish-brown color, the thorax being quite 

 dark— almost black in some specimens. The head is small, net ex- 

 tending in front of the hood-like thorax. The thorax has the ante- 

 rior half, especially the front slope, covered with spine like points. 

 The elytra are slightly granulated, paler than the thorax ; the tips 

 suddenly bent down, from each of which (in the males) extends back- 

 ward a sharp spine ; in the female, instead of the spine, is a smooth 

 prominence. The underside a very dark-brown. Length nearly three- 

 eighths of an inch, width about one-third the length. 



These insects in the perfect state gnaw into the twigs, always se- 

 lecting the axil of a bud or little branch as the point of operation 

 Although their attacks, in this stage, appear to be directed against 

 apple trees, and especially the young trees, yet they are by no means 

 confined to these but are' found depredating upon other trees as the- 

 peach and hickory, and even upon grape-vines. Professor Riley thinks- 

 the Benoni and red June apple trees are more subject to their attacks 

 than other varieties. The transformations of this species do not ap- 

 pear to have been carefully studied. lam inclined to think the- 

 larva works in the hickory— that it is a borer cannot be doubted and 

 I have found a larva working in the hickory which most certainly be- 

 longs to this genus and does not correspond in its operations to the- 

 following which bores in the hickory. 



Spec. char. Imago.— Antennae rather short and slender terminating in 

 three enlarged serrate joints. Dark, reddish-brown, almost black on 



