1919] Blackman — Notes on Species of Pifyopkthorus 137 



region of New York. On later examination these proved to be- 

 long to the closely allied species recently described by Swaine 

 (1917^). The adults were obtained from storm-broken small 

 branches of white pine and had but recently entered the bark at 

 the axils of smaller twigs, where they were constructing their brood 

 chambers. Usually one male and two or more females were ob- 

 tained from each nuptial chamber. In a few cases the females 

 had started egg-galleries and had deposited several eggs but most 

 of the burrows were not so far advanced. As these beetles were 

 believed to be P. cariniceps no observations on the latter stages of 

 the brood burrows were made, but so far as observed, the breeding 

 habits seem to agree very closely with the older species. 



Pityophthorus granulatus Swaine. 



The distribution of Pityophthorus granulatus Swaine is given by 

 Swaine^ as Manitoba, Quebec, and Nova Scotia, and the host 

 trees as Jack Pine, White Pine and Balsam Fir. Specimens of this 

 species in central New York breed very commonly in the thin 

 barked region of white pine. They are most frequently found in 

 the shaded-out limbs of larger pine trees and in the upper regions 

 of small trees killed or dying by suppression. Small suppressed 

 pines in the "red topped" condition are nearly sure to contain the 

 brood of these small beetles and while they are occasionally found 

 in broken limbs and in slash, they are much more characteristic of 

 slowly dying limbs and tops. They breed by preference in thin- 

 barked pine from 1 inch to 3 inches in diameter but are also found 

 rather frequently in smaller limbs and twigs down to j of an inch 

 thick, in which material they are likely to be accompanied by 

 P. nudus Sw. 



The brood burrows of P. granulatus (Plate VIII, fig. 2, 3) differ 

 considerably from those of P. cariniceps in several respects. They 

 are, of course, much finer as would be expected from the smaller, 

 more slender form of the beetles making them, but the most striking 

 differences have to do with the larger number of egg-galleries in 

 each engraving and the extraordinary length of these egg-galleries. 



The nuptial chamber is often very small — so small that in many 

 cases it seems to be merely the meeting point of a number of egg- 



i Dom. Can., Ent. Br., Dept. Agr., Bull. 14, p. 24, 25. 

 » Dom. Can., Ent. Br., Dept. Agri., Bull. 14, p. 106. 



