55 



Crypturgus borealis Sw.; Dom. Ent. Br., Dept. Agric., Bull. 14: 7, 1917. 



Length, 1-2 mm.; closely related to corrugatus from Pennsylvania, but 

 with the elytra less coarsely punctured, and slightly but usually distinctly 

 larger. The female front with the postepistomal region triangularly flat- 

 tened, coarsely reticulate and setose-punctate, the elytral tip subcircularly 

 spongy; the male with the postepistomal area more strongly flattened, 

 slightly plano-concave, the elytral tip normal, granulate and setose-punctate. 



Host trees. Tamarack (Manitoba), White Spruce (northern Alberta), 

 Sitka Spruce (British Columbia Coast region). 



Distribution. Manitoba, northern Alberta, Colorado. A common 

 species in Sitka spruce of the British Columbia Coast region presents minor 

 differences, but is probably not distinct. 



The Genus Dolurgus Eichhoff. 

 Berl. Ent. Zeitschr., 147, 1868. 



Dolurgus pumilus Mannh.; Bull. Mosc., 297, 1843. 



Length, 1 6 to 2 mm. Its tunnels usually originate from those of Ips 

 concinnus. 



Host trees. Sitka Spruce. 



Distribution. Alaska through the British Columbia Coast region and 

 south to Oregon. 



The Genus Polygraphus Erichson. 

 Wieg. Archiv., 1:57, 1836. 



In 1911 Seitner separated the genus Pseudopolygraphus from Polygraphus on 

 the basis of the 6-segmented funicle, with grandiclava Thorns, as type. In 1915 

 Hopkins employed Lepisoma Kirby for the American species, rufipennis Ky., 

 | and the European species grandiclava, as distinct from Polygraphus Er. on 

 ! account of the same character, the 6-segmented funicle. Lepisoma Kirby 

 would of course have preference over Pseudopolygraphus Seit. 



The number of segments in the funicle is usually a very important character 

 in this family; but within the limits of the old genus Polygraphus Er. the variation 

 in the number of funicular segments within the certain limits of individual 

 [species is so great that it would appear to be of doubtful value as a generic 

 character. It has been pointed out by Rohrl that less than fifty per cent of 

 grandiclava specimens examined had the funicle regularly 6-segmented. Our 

 species, rufipennis Ky., appears to be more regular in this regard, having usually 

 a 6-segmented funicle, but about one out of six in our material studied, have 

 the funicle either 5-segmented or 5-segmented with the second segment partly 

 divided (PL 10, figs. 27a, 27b). The other character given for Pseudopolygraphus 

 by European writers, the lack of hairs on the second and third segments of the 

 funicle, seems hardly of generic importance. 



In view of the very close similarity in characters between the species 

 concerned, and the intergrading variations in the generic characters proposed 

 for Lepisoma, it seems desirable to include all the species under Polygraphus Er. 



We have apparently but one species in our territory, P. rufipennis Ky. 



Polygraphus rufipennis Ky., Faun. Bor. Am., 4: 193, Apate (Lepisoma) 1837; 



Bethune, Can. Ent., 4:152, 1872: nigriceps Ky.,; 1. c. 4: 194, 1837: 

 saginatus Mannh., Bull Mosc., 237, 1853. 



Length, 2-3 mm.; a stout species, black with the elytra piceous. The 

 divided eyes and unsegmented antennal club are quite distinctive. The 

 female has the front flat, shining, finely and closely punctured, and rather 

 densely clothed with short yellow hairs; the male has the front convex 

 above, with one, or more commonly two, small approximate tubercles 



