PINE BARK-BEETLES. 
723 
Fig. 252. — Hylurgops pini/ex. — 
Smith and Miss Sullivan del. 
Fig. 253. -Mine of Hy- 
lurgops pini/ex, with 
eggs along the lower 
side. — Gissler del. 
doubtless very similar to those of the boring Hylurgus, but the beetle 
is always slightly smaller, measuriug 0.2U in length, and is darker col- 
ored, being deep chestnut red or sometimes black, tinged with chest- 
nut. It moreover is destitute of the hairiness of that species, having 
only a thin fine short beard on the hind part of its wing-covers. Its 
thorax and wing-covers have the same sculpture with that. Its head 
shows no line along the middle, except upon the upper lip, where is a 
slender short elevated one, which ends before it reaches a slight trans- 
verse depression which crosses 
the lower part of the face. Its 
body beneath is black, the legs 
dark chestnut, with the thighs 
commonly black. It moreover 
differs generically from the 
preceding in having seven, iu- 
stead of but four, small joints 
in its antennae, between the 
long club-shaped basal joint 
and the knob at the tip, which 
knob is shaped like an egg, 
and is divided by transverse 
lines into four short joints. Its 
shanks also have only fine den- 
ticulations along their outer 
edge near the tip, in place of the coarse saw-like teeth, which are seen 
in the foregoing insect. It thus pertains to the genus Hylastes of 
Erichson." (Fitch.) 
I have found several beetles of 
this species (identified by Dr. 
Horn) under the bark of a white 
pine stump, at Brunswick, Me., 
August 15 to 20, 1881. The tree 
was felled in November, 1880. 
The beetles had evidently re- 
cently transformed from the 
pupa state, as they were with 
one exception pale red, the color 
of the fully mature beetle being 
black-brown. According to Eich- 
hoff this beetle is the same as 
Hylastes glabratns Zetterstedt. 
Also see p. 708. 
Fig. 254 represents a" freshly- 
hatched Hylurgops, which is 
1.5 mm in length. The head is very large, while the spiracles are distinct, 
and the stomach (st), intestines (i), and rectum (r) are distinctly visible. 
Pig. 254— Hylurgops pini/ex, a, larva immediately 
after hatching ; a 1 , nat. size; b, side view; c. end 
of hod}" ; i, intestine ; r, rectum ; as, anal sucker i 
a", vent; st*, thoracic stigmata; ast\ first abdom- 
inal ; ast 8 , eighth ahdominal stigmata.— Gissler del. 
