720 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



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

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

 suture not elevated iu 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 antennse pale dull yellow. (Fitch.) 



We have found this beetle iu the piue woods of Maiue ; it was kindly 

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

 Pinus strobus iu long nearly straight burrows ; the beetles may be found 

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



4G. Gnathotrichus asperulus LeC. 



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

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

 rubbed specimens of Pityophthorus mmutissimus, from which it differs 

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

 from Pinus inops near Washington in May. In this tree it will i^rob- 

 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. Fityophthorus sparsus LeConte. 



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

 ing this beetle: 



The species found by Blanchard (to me No. 36) under white pine bark is P. 82}arsus 

 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, aud on the outer limit of the 

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

 tenuis. 



48. Xylehorus spara^is LeConte. 



A number of beetles from the bark of a dead white pine [Pimts 

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

 ferred to this species by Dr. Horn. 



49. The spruce timber beetle. 



Xyloterus bivittatus Mannheim. 



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



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

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

 account the reader is referred to spruce insects. 



