686 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



furrow withsruootli sides, somewhat iaternipted in the middle ; elytra densely punct- 

 ured, with alternate oblong, raised, shining interstitial spaces, prolonged entire to 

 the apex ; length, .57 to .75 inch. Male with the pectus broadly sulcate, villose ; 

 the intei mediate tibiae armed with an internal acute tooth ; the last ventral segment 

 truiicate-emarginate. Female with the pectus smoother, less sulcate ; the last ven- 

 tral segment tridentate ; the intermediate tooth obtuse, defined by minute incisions. 



Abundant at Lake Superior ; according to Kirby found in latitude 

 65° and in the Rocky Mountains. In addition to the characters given 

 above, Le Conte adds : 



The under surface is copper-colored, coarsely and densely punctured on the sides, 

 abdomen and prosternum, less densely on the metasternum and middle of the first 

 segment of the abdomen ; the divided portions of the mesosternum are coarsely and 

 tolerably densely punctured. The outer costse of the thorax are interrupted so as to 

 form on each side an apical and basal callosity. A female from Newfoundland 

 differs by the epipleune being green, the under surface of the prolonged extremity 

 of the elytra blue, and by the incisures between the anal teeth being more widely 

 separated. 



Mr. George Hunt has found this beetle under the bark of the white 

 pine in the Adirondack Mountains, New York, in October. 



20. The common longicorn pine-borer. 



Monohammua confusor Kirby. 

 Order Coleoptera ; family Cerambycid^. 



Boring a hole, in outline round and regular, deep in the wood of sound, though 

 usually in decaying trees, and doing much injury to pine timber; a large, soft, white, 

 fleshy, nearly cylindrical grub, the segment next the head larger than the others, 

 flattened, horny, and inclined obliquely downward and forward, the succeeding rings 

 very short, with a transverse oval rough space on the middle above and below ; pupat- 

 ing inside in the wood, the beetle emerging from a round hole half an inch in diameter ; 

 the beetle one of our largest longicorns, with very long antennae : the body brownish- 

 gray, the wing-covers spotted with black and white ; length, 1.20 inch. 



Nothing was known of the habits of this borer by Harris, in the third 

 edition of whose treatise the beetle is well figured. In 1860 Dr. Fitch 

 gave an excellent account of the habits, and a brief description of the 

 larva and pupa and adult, in his Fourth Report on the Noxious Insects 

 of New York. The following description of the larva and pupa is based 

 on specimens obtained at Brunswick, Me., and compared with some 

 received from Mr. F. C. Bowditch, who published in the American Nat- 

 uralist, August, 1873 (p. 498), an account of the habits and transforma- 

 tions. He sent me a block of pine wood split off, containing the ter- 

 minal portion of the cell, stuffed with large chips arranged quite regu- 

 larly. In the museum of the Peabody Academy of Science, at Salem, 

 is a piece of planed plank, which had been sawed so as to uncover part 

 of the hole, with the beetle within, as seen in Fig. 227. Fitch states that 

 this and Monohammus scutellatus and marmoratus are the most common 

 and pernicious borers which occur in the pine timber of New York. 

 On a still summer's night as well as in the day-time the peculiar grating 

 or crunching noise which the larvse make in gnawing the wood may be 



