492 SEVENTH REPORT OF THE FOREST, FISH AND GAME COMMISSION. 



Pityoplithorus Species. 



A small species belonging to this genus was met with by the writer September 

 8, 1900, at Karner, working under the bark of a dead hard pine limb. Recently 

 transformed adults and a few pup?e were observed in the galleries. The twig was 

 also bored by a Buprestid larva. The adult galleries of this insect are remarkable 

 for their delicac}'. They are represented much reduced in plate 10 figure 5. It will 

 be seen that the general design has been much marred by the work of the 

 Buprestid above mentioned, and the tortuous larval galleries may be seen branching 

 from the primary ones at irregular and somewhat considerable distances. The lar\'a, 

 as it attains maturity, appears to make a very irregular excavation, which some- 

 times doubles back upon itself or is simply a very broad excavation. 



Pityopht/ionis Species. 



Another insect belonging to this genus v.'as met by the writer August 22, 1900, 

 at Axton, where it was working in small numbers under the bark of a young dying 

 white pine. The central chamber of this species is somewhat circular and in the 

 specimen figured has four primary galleries with a short fifth. The primary or egg 

 galleries run longitudinally or obliquely to the wood fibers and cut into tlie wood 

 a considerable proportion of their depth. The larval galleries are somewhat 

 tortuous, expand very gradually, and cut the sap wood for about one-half their 

 depth, and toward the extremities a greater proportion lies in the wood (Figure 9). 



Borers of dead, frequently nearly rotten, bark. The forms noted above are 

 all bark borers and a student of their habits will observe that each species has char- 

 acteristic methods of work and is limited by certain conditions. The insects noticed 

 below appear to prefer diseased or dying tissues and thrive only to a limited e.xtent 

 in dead or decaying bark. 



RIBBED RHAGIUM. 



Rhagium Iincatuui Oliv. 



A white, broad-headed, flattened grub may frequently be found in considerable 

 numbers under the bark of dead white pine previously bored by various bark 

 beetles, such as those mentioned above. This species is exceedingly common and 

 has been met with by the writer in the vicinity of Albany in large numbers. This 

 beetle was so abundant in 1901 that about 50 adults and numerous pupje and 

 larvae were obtained in a few minutes from under the bark of one tree at 

 Lansingburgh. This species is never injurious to living trees, so far as our e.xperi- 



