PINE BARK-BEETLES. 



723 



Pig. 252. — Hylurgops pinifex.— 

 Smith and Miss Sullivan del 



Fig. 253.-Mineofffj/- 

 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, measuring 0.2U ia 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, in- 

 stead of but four, small joints 

 in its anteunte, 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 deu- 

 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 Rylastes 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 glabratus Zetterstedt. 

 Also see p. 708. 



Fig. 254 represents a freshly- 

 hatched Hylurgops, which is 

 1.5™"" in length. The head is very large, while the spiracles are distinct, 

 and the stomach {st), intestines (i), and rectum (r) are distinctly visible. 



Fig. 254 — Hylurgops pinifex, a, larva immediately 

 after hatching ; a', nat. size; b, side view; c, end 

 of bod J' ; i, intestine ; r, rectum : at, anal sucker ; 

 a", vent; «?', thoraric stigmata; a«<', first abdom- 

 inal; a««8, eighth abdominal stigmata.— Gissler d(?J. 



