124 



Host trees. Balsam Fir, Eastern Larch. 



Distribution. Eastern Canada and Eastern United States, probably 

 throughout the range of the eastern balsam. 



An important primary enemy of balsam fir. 



Pityokteines elegans Sw.; Can. Ent., 48: 182, 1916. 



Length, 2-5 mm. This species is known to us only from Hood river, 

 Oregon, and Hayfork, Cal., but possibly extends into British Columbia. 

 It probably breeds in one of the western balsams, with habits similar to 

 those of sparsus Lee., to which it is closely allied. 



Pityokteines minutus Sw.; Can. Ent., 44: 352, 1912 (Dryoccetes) . 



Length, 1 7 mm. to 2 3 mm. This species was described from the female ; 

 owing to the almost complete absence of even granules on the type it was 

 placed erroneously in the genus Dryocoetes. The type is from Colorado; 

 the host tree unknown. 



Pityokteines jasperi Sw.; Can. Ent., 48: 181, 1916. 



Length, 2-3 mm.; very slender; the female with the front plano-convex, 

 densely finely granulate and densely hairy as in minutus; the front of the 

 male plano-convex, densely, deeply granulate-punctate and sparsely hairy. 

 The elytra are slightly but constantly shorter than the type of minutus Sw. 

 Recent collections indicate that jasperi is only doubtfully distinct from 

 minutus. 



Host trees. Mountain Balsam (Alberta); Douglas Fir (Oregon). 



Distribution. Jasper Park, Alberta; probably extending southward in 

 the Canadian Rockies; Oregon. 



The Genus Anisandrus Ferrari. 

 Ferrari, Borkenkafer, 24, 1867. 



Key to the Canadian Species. 



A The body stout, cylindric, with the hind wings well developed. The 

 pronotum asperate in front, nearly smooth behind; the 2nd and 3rd 

 interspaces of the declivity without teeth. Females (PL 11, fig. 2). 

 B The elytra with the sides strongly angled behind as viewed frofh above, 



and the apex subacute (PL 18, fig. 16). 



C The declivital ridge of the 7th interspace with a few elongate teeth 



intermixed with granules; a much larger species, length, 3-3 mm. 



to 3-7 mm. (PL 18, fig. 16). obesus Lee. Page 125. 



CC The declivital ridge with granules only; the form more slender, a 



smaller species; length, 3 mm. to 3-2 mm. 



. populi Sw. Page 126. 



BB The elytra with the sides behind and the caudal margin evenly arcuate. 

 C A larger species; length, 3 mm. to 3-25 mm.; the pronotum as long 

 as wide; the strial punctures of the elytra closely placed, the 

 distance between the punctures equal to or less than their dia- 

 meter (PL 11, fig. 2). pyri Peck. Page 125. 



PLATE 29. 



Dendroctonus brevicomis Lee., The Western Pine Bark-beetle; pitch-tubes on the bark surface of 

 an infested western yellow pine; near Princeton, B.C. (Author's illustration). 



