PINE BORERS. 70& 



long and narrowish, its head aud thorax much narrower than the wing-covers, 

 cylindric, clothed with soft gray hairs upon a black ground) 

 the thorax with a black stripe above and one on each 

 side, where is also a stout spine ; the antennae only reach- 

 ing the base of the win.<T-covers, which are dull yellowish 

 gray variegated with black, each with three elevated lines, 

 the outer two uniting at their tips. (Harris' Treatise, 

 p. 102.) 



We have found the beetles and pupse of this 

 beetle under the bark of a white pine log at Salem, 

 Mass., in abundance in October, and have also 

 detected it frequently in Maine in the same situa- 

 tions in the spring, April 24, both in the larval 



' °' ' Fig. 2i1.—Ifhagm7}i linca- 



and adult state. <Mw.-Marx da. 



This larva is very common under the bark of 

 pines which have been cut down for a year or more, so that the larva 

 evidently gets its growth in a year. It may be easily recognized by 

 its large size, the broad, flattened head and body, the latter not nar- 

 rowing behind ; the prothorax is small in proportion to the head, while 

 the antennae are minute, two-jointed. The form of the body, and espe- 

 cially of the hard, corneous head admirably adapts it for its work of 

 loosening the bark, and thus forwarding the decay of stumps and fallen 

 trees. 



Larva. — Body long and narrow, head remarkably large, as wide and as large as 

 the prothoracic segment. 



Head behind with a triangular incision ; the apex of the incision is met by a 

 curved line passing back from the outside of the antennae, dividing the epicranium 

 into two areas. Clypeus more solid than usual. Labrum about twice as wide as 

 long, and moderately rounded in front. Antennae minute, very short, two-jointed, 

 the joints much shorter than broad (when retracted), and the second joint blunt at 

 tip. Mandibles large, with three teeth on the cutting edge. Maxillae composed of 

 two broad segments and a third narrower one bearing the maxillary lobe and palpus ; 

 the lobe long and narrow, curved inward, reaching to the middle of the third palpal 

 joiu^ palpus three-jointed, the basal joint somewhat swollen at the end ; second as 

 long as the first, tapering toward the distal end ; third small, conical, as long as the 

 second is thick. Mentum wider than long, square; ligula square, but slightly con- 

 vex on front edge ; labial palpi three-jointed, second joint a little glenderer than 

 first, but of the same length ; third joint slender and as long as the second is thick. 



Prothoracic segment not so much wider than the rest of the body as in the Longi- 

 coru larvae in general ; sides straight, retreating posteriorly ; surface flat and chiti- 

 nous ; meso and metathoracic segments as wide as the prothoracic, but a little more 

 than one-half as long as the first abdominal segment. Thoracic feet long and slender, 

 four-jointed, the fourth joint minute, corneous, second and third joints of the same 

 length, the third two-thirds as thick as the second. 



Abdominal segments increasing very slightly in length to the eighth, which is 

 slightly longer than the preceding ones, but a little narrower than the seventh ; the 

 ninth shorter and nearly one-quarter narrower than the eighth ; the tenth scarcely 

 visible from above, one-quarter to one-fifth as wide as the ninth, and deeply cleft 

 posteriorly. Callosities very large, soft, not well defined, being elongate, trans- 

 versely-oval areas, bounded laterally bj- curvilinear impressed lines. Beneath, the 

 callosities are a little more distinctly marked, with a transverse deeply impressed 

 straight median line, into which short curved lines pass, the whole area being oval- 

 cylindrical, compressed in the middle. The hairs on the body rather long. 

 5 ENT 45 



