FAMILY CERAMBYCIDjE. 121 



The larvae of the Sapcrda calcarata infest lombardy poplars. Ihey are yellowish white, 

 and, when lull grown or mature, are nearly two inches long : the body is thick, dilated 

 before, and consists of twelve segments separated from each other by deep transverse 

 furrows. In August and September, the beetle may be found on the different species of 

 poplar : it flies by night. It is harmless in comparison to the appletree saperda ; but one 

 of our finest shade trees is the aspen, which is often destroyed by this borer. Their pre- 

 sence may be known by their castings, which lodge on some part of the tree. 



The Sapcrda (Obcrea) tripunctata seems to be equally destructive with the two former 

 to forest and shade trees. It is about the size of the Candida, but quite different in its 

 markings, as will be seen by a reference to the description. It attacks the linden, and, by 

 burrowing beneath the bark, destroys the vitality of the tree, large flakes of which fall oft" 

 gradually and drop to the ground as their attachments are broken. 



Saperda vestita. ( Plate xxvi, fig- 4.) 



Color olive or light drab, nearly uniform : surface beneath the close-pressed nap, black. 



Head and thorax immaculate. Elytra dotted, each dot giving origin to a small pencil 



of black hairs : dot-punctures in lines at the base and along the sides, and marked 



with four black dots a little above the middle of the elytra ; and sometimes there are 



other dots, owing to the denuded nap upon little elevated points of the elytra. Length 



seven-tenths of an inch. 



This species attacks the linden : the larva, by their burrows beneath the bark and 



within the wood, effectually destroy the tree in a few years. 



Saperda Candida (Fab.). S. bivittafa (Say). ( Plate xvi, fig. 3.) 



Color light brown, marked upon the upper side with two white stripes extending the whole 

 length of the insect : face, antennae, underside of the body and legs white. The white 

 is due to the clothing, which consists of a white close-pressed short nap : where rub- 

 bed off, the surface is black. The white stripes decussate from the forehead, leaving 

 the grey-brown stripe on the top of the thorax passing down the sutural line. Length 

 six- to seven-tenths of an inch. 



Saperda (Anjerea) calcarata. (Plate xvi, fig. 1.) 



Color gray or ashen, and covered with a short dense close nap : surface covered with 

 raised points or dots : thorax marked with three pale ochreous stripes, which de- 

 cussate from the forehead. The elytra are also marked by partial stripes and bands of 

 the same color : apex terminating in a straight short spine ; beneath pale gray ochre- 

 ous. Beneath the nap, the surface is black. Length nine-tenths of an inch. 

 [Agricultural Report — Vol. v.] 16 



