PSYCHE 



VOL. XXVI AUGUST. 1919 No. 4 



NOTES ON FOREST INSECTS. 



I. ON TWO BARK-BEETLES ATTACKING THE TRUNKS 

 OF ^MIITE PINE TREES. 



By M. W. Blackman, Ph.D., 



Professor of Forest Entomology, New York State College of 



Forestry, Syracuse, N. Y. 



So little is kno^\Ti of the life history and habits of some of our 

 common forest insects that even more or less casual or fragmentary 

 observations are often of value and should be recorded in order to 

 make them available for other workers. During the past few 

 years the writer has accumulated a considerable amount of such 

 data either in the way of more or less disconnected field observa- 

 tions, or in the course of work upon larger problems undertaken 

 either individually or as joint problems with advanced student 

 working in the laboratory. In the present paper are presented 

 data upon several insects affecting the white pine, Pinus strobus. 

 Part of the observations, especially the experimental data on 

 Hylurgops pinifex Fitch and some of the field observations on Ips 

 longidens Sw., were made by a former graduate student, Capt. 

 A. J. MacNab, to whom we wish to make due acknowledgments. 



Ips longidens Swaine. 



Ips longidens was described by Swaine in 1911^ (p. 214), but no 

 later mention of it has been found in the literature except that by 

 the same author (1918, p. 114) .^ The only host tree recorded is 

 "Eastern Hemlock" and the distribution is given as New York 

 State and Nova Scotia. Although not included by Blatchley and 

 Leng (1916) among the Scolytidse of northeastern North America, 

 there can be no doubt as to the validity of the species. Indeed, 



» Canadian Ent., Vol. XLIII, pp. 213-223. 



' Dominion Canada, Dept. Agri., Ent. Br., Bull. 14, p. 114. 



