472 COLEOPTEUA. 



bicaudatus Say (Fig. 442) in the valley of the Mississippi, is 

 very injurious to apple trees, boring under the bark of small 

 twigs "just above one of the buds, and on cutting into them 

 it will be noticed that a cylindrical hole, about the size of a 

 common knitting needle, extends downwards from the perfora- 

 tion above the bud, through the very heart of the twig, for the 

 length of an inch and a half." (Walsh.) The larva which I 

 have received from Dr. Shimer, has much the same form as 

 that of Lyctus, but the head is more prominent and also the 

 sides of the body. The anterior half of the body is consider- 

 ably thicker than behind and the legs are provided with long 

 hairs ; the end of the body is smooth and much rounded. It 

 is .30 of an inch, long. 



Specimens of Rhizopertlia pusilla have been introduced, Le- 

 conte states, into wheat distributed from the Patent Office. 

 In this last genus tlie eighth and ninth joints of the antennae 

 are triangular. 



In the genus Lyctus the head is prominent, the body long 

 and narrow, and the club of the antenna is two-jointed, while 

 the outer apical angle of the anterior 

 tibiae is prolonged. We have received 

 from Dr. H. Shimer, L. opaculus Lee., 

 in all its stages (Fig. 443 ; a, larva ; 

 &, pupa). The beetle is chestnut 

 brown, with short yellowish hairs and 

 puncto-striate elytra ; it is .20 of an 

 inch in length. The larva is white, its body is cylindrical, 

 thick and fleshy, with a small head and strong black mandibles ; 

 the thoracic rings are thickest. It is .17 of inch long. Ac- 

 cording to Dr. Shimer it eats the wood of dead grape vines. 



CIOIDJE Leach. This small group is known by the maxillae 

 being exposed at the base, the two ciliate lobes of which are 

 flattened, and the eight to ten-jointed clavate antennae are in- 

 serted at the anterior margin of the eyes ; the head is protected 

 by the prothorax, which is cylindrical, rounded in front, with 

 the lateral margin distinct. The species of the genus Cis, 

 which have ten-jointed antennae, are very small, cylindrical, 

 dark colored, gregarious beetles, which live under the bark of 



