720 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



rows; the upper part of the apical declivity moderately depressed in the middle, 

 producing a slight concavity in its outline when viewed from above anteriorly, the 

 suture not elevated in this depression, but showing a slightly impressed line along 

 each side ; the hind end bearded with hairs similar to those upon the front. Under 

 side black, the legs and antenna pale dull yellow. (Fitch.) 



We have found this beetle in the pine woods of Maine ; it was kindly 

 identified for us by Dr. Le Conte. It bores deep into the sap-wood of 

 Pinus strohns in long nearly straight burrows ; the beetles may be found 

 in them in March, their heads pointing towards the center of the tree. 



46. Gnathotrichus asperulus LeC. 



Mr. Schwarz remarks that this beetle is perhaps not rare, but uot 

 easily recognized. "It bears a close resemblance to the smaller and 

 rubbed specimens of Pityophthorus mimitissimus, from which it difiers 

 mainly by the vestiture of the antenual stub. I beat two specimens 

 from Pinus inops near Washington in May. In this tree it will prob- 

 ably be found boring in the same manner as G. materarius. Le Conte 

 gives its length as 1.5'"'" (.06 inch.) " 



Mr. W. H. Harrington states that about the middle of May pine sap- 

 lings may often be seen with drops of balsam oozing out of the bark and 

 standing like beads of amber all over the trunk and limbs. Each of these 

 drops show where one of these minute beetles has perforated the bark. 

 On examination, many will be found still in their tiny burrows beneath 

 the bark, usually in groups of three or four, and others will be found 

 boring their way through the bark to deposit eggs. 



47. Pityophthorus sparsits LeConte. 



The late Dr. Le Conte wrote on October 13, 1881, as follows regard- 

 ing this beetle: 



The species found bj Blanchard (to me No. 36) under white pine bark is P. sparsits 

 and is easily known by the prothorax having a smooth spot each side behind the 

 middle, and by the very shining luster. The elytra are feebly and sparsely punct- 

 ured, the declivity is deeply sulcate near the suture, and on the outer limit of the 

 groove are two or three acute cusps. This species is depredated on by HypopMoeas 

 tenuis. 



48. Xyleborus sparsus LeConte. 



A number of beetles from the bark of a dead white pine {Pinus 

 strobus) received from the Peabody Academy, Salem, Mass., were re- 

 ferred to this species by Dr. Horn. 



49. The spruce timber beetle. 



Xylolerus bivittatus Mannheim. 



(Larva and pupa, Plate xxiv, tigs. 1, 1".) 



This insect, though common under the bark of the white pine in 

 Maine, is especially destructive to the spruce and fir, and for a further 

 account the reader is referred to spruce insects. 



