COLEOPTERA. 77 



the lifth volume of the " New England Farmer." * The larvae 

 or grubs of these bark-beetles resemble those of the Hijlurg^s 

 terebrans or pine bark-beetle already described. Like the 

 grubs of the weevils, they are short and thick, and destitute 

 of legs. 



The red cedar is inhabited by a very small bark-beetle, named 

 by Mr. Say Hplu?-g-ns dentatus, the toothed Hylurgus. It is 

 nearly one tenth of an inch in length, and of a dark brown 

 color; the wing-cases are rough with little grains, which be- 

 come more elevated towards the hinder part, and are arranged 

 in longitudinal rows, with little furrows between them. The 

 tooth-like appearance of these little elevations suggested the 

 name given to this species. The female bores a cylindrical 

 passage beneath the bark of the cedar, dropping her eggs at 

 short intervals as she goes along, and dies at the end of her 

 burrow when her eggs are all laid. The grubs hatched from 

 these proceed in feeding nearly at right angles, forming on 

 each side numerous parallel furrows, smaller than the central 

 tube of the female. They complete their transformations in 

 October, and eat their way through the bark, which will then 

 be seen to be perforated with thousands of little round holes, 

 through which the beetles have escaped. 



Under the bark of the pitch-pine I have found, in company 

 with the pine bark-beetle, a more slender bark-beetle, of a dark 

 chestnut-brown color, clothed with a few short yellowish hairs, 

 with a long, almost egg-shaped thorax, which is very rough 

 before, and short wing-covers, deeply punctured in rows, hol- 

 lowed out at the tip like a gouge, and beset around the outer 

 edge of the hollow with six little teeth on each side. This 

 beetle measures one fifth of an inch, or rather more, in length. 

 It arrives at maturity in the autumn, but does not come out of 

 "^the bark till the following spring, at which time it lays its eggs. 

 It is the Tomicus exesus, or excavated Tomicus; the specific 

 name, signifying eaten out or excavated, was given to it by 

 Mr. Say on accovmt of the hollowed and bitten appearance of 

 the end of its wing-covers. Its grubs eat zigzag and wavy 



♦ Page 169. 



