﻿New Species of Ipidac from Maine IID 



larvae. This small tree occurred in a very dense stand of spruce, 

 and it also had been so greatly weakened by overshading as to 

 make it a suitable breeding place for the beetles. 



During the summer of 1921 the writer also obtained a number 

 of specimens from red spruce at Cranberrj'- Lake, N. Y. The 

 dates of collection are June 24, July 17, Aug. 3 and Aug. 5, 1921. 

 All were obtained from small, shaded-out red spruce trees and the 

 beetles were present in only small numbers. 



The burrows consist of an entrance tunnel which leads directly 

 into a rather large irregular shaped nuptial chamber. In the 

 majority of cases but two egg-galleries lead off from the central 

 chamber and usually extend in a nearly transverse direction. In 

 several burrows, however, one or more additional galleries are to 

 be found. These are in all cases short, are nearly at right angles 

 to the first two and contain only a few egg-niches. The number 

 of egg-niches in an egg gallery varies from 8 to 29 in those counted 

 and the number of niches to the engraving varies from 21 to 51. 



As regards its economic importance the species seems not to be 

 at all common and all of the trees in which it was found were 

 such as had been either greatly weakened or actually killed by 

 suppression. In white pine it was associated with Ips pini Say, 

 I-'ityophthorus granulatns Sw. and P. nuchis Sw. While in white 

 spruce no other bark beetle occurred in the same region of the 

 tree, but P. opaculus Lee. and Cryphalus mainensis n. sp. were 

 breeding in the limbs and twigs. 



Pityophthorus balsameus n. sp. 



Description of adult female: Very dark reddish brown, 

 almost black; 1.88 mm. long, 2.87 times as long as wide. 



Front flattened, with a reniform, spongy area of a light reddish- 

 brown color; median carina indicated by a distinct tooth just 

 above the epistomal margin; marginal hairs abundant near the 

 broadly emarginate center, sparse laterally ; remainder of frons 

 rather coarsely and roughly punctured ; apparently glabrous ; eyes 

 emarginate; aniennal club nearly as broad as long, first and second 

 sutures similarly, third suture more strongly arcuate ; club at least 

 one-fourth longer than funicle. 



Pronotum 1.2 times as long as wide, jjosterior half with sides 

 subparallel, broadly rounded in front ; front margin distinctly 

 serrate ; anterior area moderately asperate ; summit prominent, 

 with well-marked, wide, transverse impression behind the summit, 

 divided by a shining, impunctate, slightly raised, median line ; 

 with a similar but less prominent longitudinal lateral elev.ition at 

 each side ; posterior half of disc with deep, moderate sized punc- 

 tures, sides rather more densely but less deeply punctured. 



Elytra wider than tjiorax, 1.78 times as long as Avide; sides very 

 faintly arcuate, very broadly rounded behind but slightly pro- 

 duced at the suture; striae not impressed except the first, strial 

 punctures rather coarse, in rows, somewhat irregular near suture; 



