120 



THE SCOLYTID BEETLES. 



well as deeply gtooved in the inner bark; larval mines and pupal 

 cells exposed in the inner bark. Eggs are placed in groups of three 

 to five or more, and the larval mines, which are short, are separated 

 from the start. The galleries differ from those of the next species 

 b}^ their smaller size, more elongate and winding form of the egg 

 galleries, and the much shorter larval galleries arranged in much 

 smaller groups. 



Distribution (fig. 74). — (Hopk. U. S.) Maine: Cupsuptic. Miclii- 

 gan: Grand Island, Munising, Mackinac Island, Seney. (Hopk. W. 

 Va.) West Virginia: Cranesville. Additional localities from other col- 

 lections: (U.S.N.M.) Ungava Bay, Canada; Agricultural College, 

 Mich. (H. & S.) Marquette, Grand Ledge, and Port Huron, Mich. 



Fig. 74. — Dendroctonus simplex: Distribution map. (Original.) 



(D. A.) West Stewartstown, N. H. One specimen in the Le Conte 

 collection under D.ohesus, labeled "Texas" (must be an erroneous 

 locality, resulting from some mistake) . 



Host tree. — Larix laricina. 



Identified specimens. — Le Conte, 10 specimens (2 under D. simplex, 

 3 under D. rufipennis, and 5 under D. similis); Horn, 3 specimens 

 (2 under simplex, 2 under similis); U.S.N.M., 6; H. & S., 10; D.A., 

 5 specimens; Hopk., W. Va., 157, and Hopk. U. S., over 150 

 specimens. 



Bibliography and Synonymy. 



Dendroctonus simplex. Le Conte, 1868, p. 173, original description, synopsis, 

 localities. Le Conte, 1876, p. 385, revision, synopsis, bibliography, localities. 

 Packard, 1887, p. 177 (Le Conte quoted). Schwarz, 1888, p. 175, synonymy, 

 habits in larch. Packard, 1887, p. 177, Le Conte quoted. Packard, 1890, p. 722 



