THE GENUS PISSODES. 57 



Distribution. — Section aS, coast of western Washington to Sitka; 

 section a4, Canadian zone, eastern United States from mountains of 

 North CaroUna to Canada, and northern Rocky Mountains and 

 Pacific Coast region northward into Alaska. 



SECTION a3. 

 (Species No. 17.) 



Adults. — Basal angles of pronotum siibrectangular and beak rather 

 stout and moderately long; apical margin of the seventh abdominal 

 sternite of male without apical process, but faintl};^ sinuate. 



Pupx. — Small spines alternating with the longer ones on abdominal 

 tergites and ninth epipleurites with a few bristles. 



Larvse. — x\bdominal spiracles obscure; apical tooth of the mandi- 

 bles acute, the median emarginate, and the eye spots distinct. The 

 host is Picea sitchensis from the coast of western Washington to vSitka. 



17. Pissodes costatus Mannerheim. 



This species is represented in the collection by a typical specimen 

 labeled with the name: ''Picea; Hoquiam, Wash. ; A. D. Hopkins, col- 

 lector; 9 2 ; Hopk. U. S. 2361g." The specimen was reared from among 

 larvge and pupse found May 26, 1903, under thick bark in chip cocoons 

 in outer wood of stump of a tree of Picea sitchensis felled in 1902. 

 This evidently comes nearer to Mannerheim's species than anything 

 yet recognized, and the fact that it is found in the Sitka spruce is 

 additional evidence. 



Distinctive characters. — This is the only representative of the first 

 section (aS) of subdivision B, and therefore is not closely allied to 

 any of the other species of the subdivision. It is distinguished by 

 the closely placed punctures of the pronotum, which become coarser 

 and more distinctly separated toward the posterior lateral section, 

 by the moderately rounded posterior angles of the pronotum, and 

 by the indistinct spots of reddish brown and white scales. 



Variations. — The three matured adults examined range in length 

 from 5.5 to 7.1 mm., and in color from dark bro^vn to black. The' 

 spots of scales vary in size, color, and density. Three adults and the 

 larva and pupa have been examined. 



Host tree. — Picea sitchensis, in thick bark on dying and felled trees 

 and stumps. 



Distribution (Plate XXI, fig. 17). — (Hopk. U. S.) Washington: 

 Hoquiam. Alaslca: Sitka (the type locality). 



Bibliography. 

 Pissodes costatus Mannerheim, 1852, p. 354 (reprint p. 71). 



