64 



Dendroctonus terebrans Oliv.; Ent. 4: 78, p. 6, pi. 1, fig. 6, a-b, 1795, 

 Scolytus; Hopkins, The Genus Dendroctonus, 147, 1909. 



Distinguished from valens by the very coarse, very shallow and sparser 

 punctures of the pronotum; the colour is usually nearly black, and the 

 epistomal process has the oblique sides much shorter with the angles usually 

 more tuberculate. 



Host trees. — Pines and Spruces. 



Distribution. — It is apparently a southern form ranging north to New 

 Hampshire; we have no records from Canada. In habits it is allied to 

 valens Lee, from which it is barely distinct. 



Dendroctonus murrayanae Hopk.; U.S. Bur. Ent., The Genus Dendroc- 

 tonus, 140, 1909. 



Length, 5 mm. to 6-5 mm. It is very closely allied to rufipennis 

 Kirby, but appears to be distinct through the characters enumerated 

 under that species. The proepisternal area is .distinctly punctured, but 

 rather coarsely granulate and roughened; the basal crenulations of the 

 elytra are sparser than usual, distinctly separated and hardly overlapped. 



Host trees. — Lodgepole Pine. Recorded by Hopkins also from Engel- 

 mann's Spruce. 



Distribution. — It has been taken in Canada only in the Rockies of 

 southern British Columbia, but it may follow the distribution of its host. 

 Not uncommon in stumps at Banff, Alta. 



Economic importance. — It is not at present a very injurious species 

 in our forests. 



Dendroctonus rufipennis Kirby; Fauna Boreali Americana, p. 195, no. 261' 

 1837; Hopkins, The Genus Dendroctonus, 138, 1909. 



Length, 6 mm. ; black with the elytra dark red; the sides of the epistomal 

 process oblique; the pronotutn constricted in front, the punctures close, 

 rather coarse, distinctly irregular in size, small and more regular behind, 

 the caudal half of the proepisternal area distinctly punctured, with the 

 punctures coarse, not close, shallow, not strongly granulate, so that the 

 surface is not much roughened; the elytra slightly wider than the pronotum, 

 the basal crenulations individually distinct but overlapping, the striae 

 rather faintly impressed, the strial punctures rather coarse and distinct, 

 the discal interspaces narrow, with the coarse granules irregular, sparse, 

 and acute, except at the base; the declivital striae narrowly, decidedly 

 impressed, with very small punctures, the declivital interspaces uniseriately 

 finely granulate and very finely, sparsely, indistinctly punctured; the 

 vestiture sparse, the long hairs extending to the base of the elytra; the 

 male with the declivity more shining, the interspaces obsoletely granulate 

 and more distinctly punctured. This species differs from murrayanoe 

 Hopk., as here interpreted, in the smoother, less deeply and roughly punc- 



PLATE 14. 

 IPID BEETLES— All Greatly Enlarged. (Original.) A.E.K. 



Fig. 1, /ps pini Say, Declivity of the female. 



Fig. 2, Ips pini Say, Declivity of the male. 



Fig. 3, Ips grandicollis Eichh., Declivity of the male. 



Fig. 4, Trypodendron retusus Lee. 



Fig. 5, Ips perroti Sw., Declivity of the female. 



Fig. 6, Ips perroti Sw., Declivity of the male. 



Fig. 7, Ips concinnus Mannh., Declivity of the female. 



Fig. 8, Ips concinnus Mannh., Declivity of the male. 



