HICKORY. TRUNK TIGER CERAMBYX. THE LARVA. 149 



Except in those cases where its burrow is taken possession of 

 by ants, the exterior opening which is made 

 by this beetle when it crawls out from the 

 tree, soon closes up, leaving a round, ragged 

 scar upon the smooth bark of the bitter wal- 

 nut and the limbs of the shag-bark walnut, 

 which is visible for many years afterwards. 

 Two of these scars are represented in the 

 annexed cut. By the occurrence of these 

 scars upon the bark we may be able to ascer- 

 tain what trees have been infested by these 



and other borers, and will consequently have the wood perforated 



with holes and unfit for any valuable use. 



Neither in Dr. Ratzeburg's celebrated work upon forest insects 

 nor any other author which I have at hand do I find any account 

 of the larvae of the important genus of wood-boring beetles to 

 which this species pertains. I therefore give a more full and 

 particular description of it. 



The Larva when full grown is somewhat over an inch in length and a quar- 

 ter of an inch in diameter across the second or broadest segment. It is a soft 

 smooth and slightly shining worm of a cream yellow color and a cylindrical 

 form, slightly bulged and broader at the thorax, and is divided into 

 thirteen segments by strongly impressed transverse lines, the sutures of 

 the abdominal segments being more wide than those of the thorax. The 

 jjM nine breathing pores upon each side form elliptical pale yellow spots 

 Qpf with a dark chesnut colored line in the centre of each; the first pore is 

 situated in the suture at the base of the second segment, the others are 

 near the middle of the fifth and each of the following segments. A faint 

 darker stripe extends along the middle of the back and is interrupted at 

 the sutures, and upon the top of each segment except the three first and two 

 last is a transverse oval space composed of somewhat irregular rows of small 

 elevated points, one row forming a ring upon the outer margin of the oval 

 space and one or two other rows running transversely across its disk. Beneath, 

 upon these same segments is a similar oval space, but the elevated points are 

 here rather more confused and indistinct. The second segment is longest and 

 the two next are shorter than any of the following ones. The second segment 

 upon its upper side is flat and inclines obliquely downwards and forwards; it 

 is clothed with fine brown hairs, and similar hairs are scattered alon" the sides 

 of the body ; across its middle is an impressed transverse line forming the arc of 

 a large circle, the ends of which line are turned backwards and are continued 

 to the basal margin by a small semicircular impressed line. The anterior part 

 of this segment is of a pale tawny color, with numerous minute punctures; its 

 basal part has coarser punctures and short impressed longitudinal lines which 



