FAMIILT CE«AM«V(nD.t:. 121 



The larvie of the Saperda calcarata infest lombjudy poplai-s. They are yfllowi>>h while, 

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

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

 furrows. In August and Septemlxr, the beetle may i)e found on the different species of 

 poplar : it Hies by night. It is harmless in coni]>aris<'n to the aj'i>]otree saperda ; but one 

 of our finest shade trees is tlie 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 Saperda [Oberca) tripunctata seems to be equally destructive with the two former 

 to forest and shade trees. It is alx>ut 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 off 

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



S.^PERDA vEsTiTA. ( Plate XX vi, fig- 4.) 



Cjlor olive or light drab, nearly unifurni : surface beneath the dose-pressed nap, black. 



Head and thorax immaculate. Klytra 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 elj^ra ; 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 larvrp, by their burrows beneath the bark and 



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



S.\pERDA CANDIDA (Fab.). S. bivittata [Saj). ( Plate xvi, fig. 3.) 



Color light brown, marked UYxm 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 oft", the surface is black. The white stripes decussate from tlie fiirehead, leaving 

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

 six- to seven-tenths of an inch. 



S.^pEKDA (An.t:kea) calcarat.^. ( 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 ]iale o<hreous stripes, which de- 

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

 the same color : apex terminating in a straight short spine; L>eneath pale grayochre- 

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



[ ACRICCLTURIL RsfOET VoL. V.] 10 



