131 



Dryocoetes americanus Hopk.; U.S. Dept. of Agric., Office of Secy., Kept. 

 No. 99, p. 51, 1915; previous literature under autographus Ratz. 



Length, 3 mm. to 4 mm. Doubtfully distinct from autographus Ratz. 

 of Europe. Several rather distinct variations could be described. The 

 so-called species of this section of the genus are little more than well marked 

 varieties. 



Host trees. White Spruce, Engelmann's Spruce, White Pine, Larch, 

 and probably all Spruces and Pines within its range. 



Distribution. Eastern North America, west into the Rocky Mountain 

 region. 



Dryocoetes septentrionis Mannh.; Bull. Mosc., 298, 1843 (Bostrichus) ; 

 semicastaneus Mannh., Bull. Mosc., 358, 1852 (Bostrichus). 



Length, 3-5 mm. to 4-7 mm., usually over 4 mm. Very closely allied 

 to americanus, with which it appears to intergrade, particularly in the 

 Rockies and Northern Alberta; usually distinguished by the smaller prono- 

 tum with the sides strongly arcuate, strongly narrowed in front and behind, 

 more strongly in front, and narrowly rounded on the front margin, and by 

 the wide elytral interspaces. The male has the front very wide; the declivity 

 often somewhat flattened and frequently obscurely granulate. 



Host trees. Sitka Spruce, Engelmann's Spruce, White Spruce. 



Distribution. Alaska and the northern coast of British Columbia, 

 eastwards throughout northern Alberta into the eastern spruce forests of 

 Northern Canada; less common in southern British Columbia. 



Dryocoetes betulaB Hopk.; U.S. Dept. of Agric., Office of Secy., Rept. 99, p. 50, 

 Redescribed, 1915; eichhoffi Hopk., Can. Ent. 26: 279, (name preoccupied). 



The female has the front plano-convex, densely granulate-punctate, 

 rather densely clothed with long, erect, yellow hairs, longer about the mar- 

 gin, with a rather distinct median smooth space; the male has the front 

 sparsely granulate-punctate and sparsely clothed with long, erect, yellow 

 hairs, the beak very wide and transversely impressed, with the median line 

 subcarinate. Length, 2-5 mm. to 4-5 mm. (PL 11, fig. 5). 



Host trees. Birches, probably all Canadian species. 



Distribution. Our largest collections are from Newfoundland, Quebec, 

 Ontario, and British Columbia. Hopkins and Felt record it from various 

 places in the Eastern States. Throughout Canada and probably throughout 

 the northern United States. 



Dryocoetes liquidambaris Hopk.; U.S. Dept. of Agric., Office of Secy., Rept. 

 99, 51, 1915. 



Closely allied to betulce; distinguished by Hopkins as follows: 



" Pronotal punctures limited to median dorsal area. Grant county, 

 West Virginia, in Betula sp. betula3 Hopk. 



" Pronotal punctures not limited to median dorsal area. Virginia 

 Beach, Va., in Liquidambar styraciftua." liquidambaris Hopk. 



Host tree. Liquidambar styraciflua. 



Distribution. Virginia Beach, Virginia, U.S.A. 



The species is unknown to us. The host plant is not indigenous to 

 Canada, but the beetle may possibly be found in Hamamelis. 



Dryocoetes confusus Sw.; Can. Ent., 146: 351, 1912; abietis Hopk, U.S. Dept. 

 Agric., Office of Sec., Rept. 99, p. 52, 1915. 



Length, 3-4 mm. to 4-2 mm., clothed with erect reddish hairs. The 

 female has the front entirely covered by a circular, very dense brush of 

 short, reddish-yellow hairs, longer about the margin; the declivity has the 

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