70G FIFTH REPORT OP THE ENTOMOLOGICAL COMMISSION. 
Length of the body, 96 to 30"" : in one :$0»"" in length the head is :i to -1""" Long 
and t; :i " broad : prothorai 8.S"" long and 6»" broad : breadth of eighth abdominal 
aegment, 5 mm . 
The cell in which the larva reata daring the winter, and in which the puna- and 
beetles reside, is irregularly oral, about is inches long and one-third as wide, 
.shallow, and partly Borronnded by ■ wide bordei i packed chips gnawed off 
from the wood, and partly by the excrement or reddish Bawdnst-like closely packed 
material, derived originally from the inner part of the bark. The entire cavity is 
thus aboot 4 inches long and -z wide, and very irregularly oval in outline, h 
probable that this larva does not make a regular wavy burrow, but remains in one 
spot, eating out in all directions from a comparatively fixed point : in this respect it 
differs from many other Cerambycid larva-. 
38. WoOD-ENGRAVaB B4RK-BEETLK. 
Xyhborus calatus Eichhoff. A'. xyhgraphus of Fitch.) 
Order COLBOPTBBA : family 8COLYTID 
(Plate xxiv ; figs. 2, 26, larva; 3, 3a. pupa. 
In the outer surface of the sap-wood and inner layers of the bark, mining a long 
slender thread-like track, usually straight, lengthwise, 4 to 8 inches long, from which 
numerous smaller short tracks branch off mostly at right angles, a small bark-beetle 
0.12 long, which comes abroad mostly in May, of a chestnut color, the declivity at 
the tip of its wing-covers having four or five minute projecting teeth upon each side. 
(Fitch.) 
This, like other bark beetles, bas a compact cylindrical body at least 
three times as long as broad, with the thorax forming almost half of 
the entire length, and having the head deeply sunk in its anterior end 
and almost hid. The antennie are quite small, and are composed of a 
long basal joint, which becomes thicker towards its tip, and is followed 
by five very small joints surmounted by a large, rouud, flattened club, 
which, is divided by sutures into three or four segments. 
This species is glossy and bearded with fine hairs. Its thorax is 
shagreened anteriorly with minute elevated points, which further back 
become less dense, and the basal half is covered with fine punctures, 
with a smooth line above along the middle from the center backwards. 
The wing-covers have rows of coarse punctures and minute ones on the 
interstices between these rows, and their tips are abruptly declined as 
though cut or gnawed off, the outer margin of this declivity having 
four or five small projecting teeth upon each side. It is usually chest- 
nut colored, with the antennae and legs paler, but individuals may be 
met with of the varieties mentioned below :* 
•Mr. Bchwarz remarks (Ent. Araer., ii, p. 41): A glance at Fitch's description plainly 
shows that he was mistaken in the identification of the species and that he had be- 
foie him what is now known as A. calatii* Eiehh. Moreover, X. xylograph** belongs 
io a group of species which do not live under the bark, but cuter the solid wood. A". 
saxeseni Bats, is said by Eichhorf (/. c, p. 280) to occur in North America, and this 
could ouly be identical with A. xylograph**. Say's name, however, would have 
priority. 
Variety a, nigricollis. Thorax black. 
b, niger. Thorax and wing-covers black. 
0, fulvus. Thorax and wing-covers pale yellowish. 
