THE (iKNTS DENDBOCTONUS. 



129 



bark, the larval mines exposed and the pupal cells partially to entirely 

 exposed. The eggs are closely placed in large groups, and the larval 

 mines are at first contiguous or nearly so, near the egg gallery, but 

 soon become separated and when completed are often as long as the 

 egg gallery or longer. The egg galleries differ from those of all of the 

 species of subdivisions A and B in being very much broader than the 

 ilia meter of the beetle's body. This broad groove is packed with 

 borings, through which a central gallery is excavated by the parent 

 beetle after the eggs have been deposited. 



Distribution (fig. 80). (Hopk. U. S.) Maine: Beaver Pond, Camp 

 Caribou, Cupsuptic, Meadows. Michigan: Grand Island, Munising. 

 X< ir Hampshire: Waterville. Additional localities from, specimens 



FIG. 80.Dendroctonus piceaperda: Distribution map. (Original.) 



identified in other collections: (Le Conte) Anticosti, Canada. (Horn) 

 Canada. (U.S.N.M., H. & S.) Isle Koyale, Mich. (D. A.) Colebrook 

 and West Stewartstown, N. H. (Wenzel) Ricketts, Pa. 



It is evident that this species follows the distribution of the spruce 

 from the higher mountains of central Pennsylvania northward and 

 eastward into New York, New Hampshire, Maine, New Brunswick, 

 and Canada, and westward to the Lake Superior region. 



Host trees. Picea nibens, P. canadensis, and P. mariana. 



Identified specimens. Le Conte, 3 specimens from Anticosti, 2 with- 

 out label, under D. rufipennis, 1 labeled "X. Y." under D. punctatus 

 (Mar. 11, '07), 2 specimens without locality labels doubtfully referred 

 to this species; Horn, 2 specimens labeled "Can.," under D. rufipen- 

 nis; U.S.X.M., H. & S., 1 specimen labeled "Isle Koyale;" Weed and 

 7998009 10 



