114 



Ips longidens Sw.; Can. Ent., 45: 214, 1911. 



Very closely allied to latidens Lee. but distinguished by the secondary 

 sexual characters, the coarser interstrial punctures, and usually by the more 

 slender pronotum. 



Host tree. Eastern Hemlock. 



Distribution. New York State, Nova Scotia. 



Ips latidens Lee.; Am. Ent. Soc. Trans., 5: 72 (Tomicus), 1874; spinifer Eichh., 

 Rat. Tomic., 53, 499, 1878 (Tomicus). 



A small slender species of the Western coast; length, 2-7 mm. to 3-5 

 mm. This species forms with longidens an isolated group, separated by 

 the nearly straight sutures of the antennal club, the deeply, closely punctate- 

 striate elytra, the arrangement of the declivital armature, the secondary 

 sexual characters, and the short though acute apical projection of the 

 declivity. 



Host tree. Western White Pine. 



Distribution. The coast region of British Columbia, extending into the 

 United States. 



Ips integer Eichh.; Berl. Ent. Zeit., 273, 1869 (Tomicus); Rat. Tomic., 226, 1878. 



A large, stout species, from 4 5 mm. to 6 mm. in length; with almost the 

 entire front coarsely, closely granulate-punctate and hairy, a shining median 

 space with a longitudinal pair of small epistomal tubercles, the sutures of 

 the antennal club all very strongly angulated; the pronotum distinctly 

 longer than wide, finely closely asperate in front, rather coarsely punctured 

 behind; the elytral strise usually strongly impressed, with coarse, deep, 

 quadrate punctures, the discal interspaces convex, the first granulate- 

 punctate to the base, the second with an oblique row of granules on the 

 caudal half and an internal row of punctures of the same length, the 

 remaining discal interspaces impunctate on the basal two-thirds; the 

 declivity coarsely punctured; the 2nd and 3rd teeth in the female conical 

 acute, from a common thickened base and connected by a lateral crescentic 

 ridge, the male with the 3rd tooth longer, subcapitate and somewhat 

 curved; the pubescence of the dorsal surface abundant, long, stiff and red- 

 dish. A very abundant species in yellow pine of southern British Columbia. 

 Readily distinguished by its large size and the characters given in the key. 



Host tree. Western Yellow Pine, and recorded from Western White 

 Pine in United States. 



Distribution. Throughout the range of yellow pine in the interior of 

 British Columbia, extending south through western United States into 

 Mexico. A secondary enemy, very abundant in slash and dying trees; 

 apparently also a primary enemy under favourable conditions. 



Ips plastographus Lee.; Am. Ent. Soc. Trans., 2: 163, 1868 (Tomicus}; Am. 

 Phil. Soc. Proc., 15: 362, 364, 1876; Hopkins, Proc. Ent. Soc. Wash., VII, 

 75-76, 1905. 



A series in our collection from California agrees with Leconte's type of 

 plastographus in the Agassiz Museum. It is doubtfully distinct from 

 integer. The length, 4-5 mm.; black, with the elytra dark red, usually 

 smaller and distinctly more slender than integer; clothed with rather short, 

 fine, gray pubescence; the pronotum coarsely, sparsely asperate in front, 

 finely, closely punctured behind; the elytral strise slightly impressed, the 

 strial punctures small and close; the interspaces nearly flat, the 1st granulate 

 and very narrow, the 2nd with a longitudinal row of granules on the 

 caudal half supported by an internal row of punctures extending to the 

 base of the elytra, the remaining discal striae impunctate on the basal two- 

 thirds, the declivital armature similar to integer, but less strongly developed. 



