107 



roughly punctured behind on the disc, the median Hne carinate, the smooth 

 area on the side distinct; the elytra only very feebly striate, punctures in 

 rows, those of the interspaces nearly as numerous and large as those of the 

 striae; the female dechvity feebly convex, deeply sulcate along the suture, 

 ' with two acute teeth on each side and a minute granule at the summit. 

 The male has the front flattened, densely granulate-punctate and hairy, 

 with a small, median, epistomal carina. 



Type. — A female; Beau Vert Lake, Jasper Park, Alberta; 30-VIII-15; 

 Lodgepole pine; 2220, J.M.S. Type No. 109. 



Host tree. — Lodgepole Pine. 



Distribution. — Jasper Park, Alberta, probably of wider distribution in 

 the Rocky Mountains and Selkirks; Nechako valley, British Columbia; 

 Atlin, B.C. 



Pityogenes plagiatus Lee; Am. Ent. Soc. Trans., 2: 161, 1868 (Xylehorus). 



Length, 2 mm. 



Host trees. — "Scrub Pine" and Southern Yellow Pine (Hopkins); 

 Red Pine and Jack Pine (Quebec province). 



Distribution. — Maryland, New York, Washington, D.C., West Virginia. 

 Abundant in West Virginia (Hopkins) ; apparently less common in the nor- 

 thern States and Canada. A species from northern Quebec in red pine 

 and jack pine agrees with the Leconte types except that the female has 

 the frontal triangular area concave and pubescent. It is not separated in 

 this memoir. 



The Genus Ips Degeer. 



DeGeer, Mem. Ins., 5: 190, 1775. 



T amicus Lat. 



Latreille, Gen. Crust. Ins., 2: 276, 1807. 



Key to the Species. 



A The sutures of the antennal club very strongly arcuate, not angulate at 

 the middle nor bisinuate; the punctures of the elytral striae and inter- 

 striae very closely uniseriate. (Pis. 10, fig. 35). 

 B The caudal half of the disc of the pronotum finely, densely, granulate- 

 punctate; the elytra rather finely punctured (PI. 14, figs. 7, 8). 



concinnus Mannh. Page 111. 



BB The caudal half of the disc of the pronotum rather coarsely, less closely 



punctured, not granulate, the surface between the punctures smooth 



and shining; the elytra rather coarsely punctured, the interstrial 



punctures as large as those of the striae, radiatae Hopk. Page 112. 



AA The sutures of the antennal club nearly straight, bisinuate, or strongly 

 angulate at the middle. 

 B The declivital margin with five or six teeth on each side; the produced 

 apical margin forming much less than one-third of the circumference. 



C The declivital margin with six teeth (PL 17, figs. 9, 11). 



calligraphus Germ. Page 112. 



CC The declivital margin with five teeth (PI. 17, fig. 2). 



D The punctures of the discal interspaces of the elytra very sparse 

 or absent on the basal half and not very densely confused 

 behind. Eastern species. 



