THE GENUS DENDROCTONUS. 



123 



represented in the LeConte collection by two specimens labeled "Or." 

 and three specimens labeled "Van." under D. similis, and one, speci- 

 men labeled "Garland Pass, Col.," under D. rufipennis. In 1900 

 it was represented in the Horn collection by one specimen labeled 

 "Col." and one specimen labeled "Cal.," and in the A. E. S. collec- 

 tion by three specimens from Oregon under D. similis and two speci- 

 mens labeled "Col." under D. rufipennis. Dietz's revision under 

 D. similis (1890, pp. 30-31) includes the characters of D. pseudo- 

 tsugse, as represented by the Oregon, Colorado, and California speci- 



FIG. 76Dendroctontu pseudotsugse: Egg gallery and larval mines, o, Egg gallery in bark and grooved 

 in surface of wood; 6, larval mines in bark; c, larval mines marked and slightly grooved on surface of 

 wood. (Original.) 



mens, while the specimens from Canada represented D. simplex, and 

 one from California referred to in the note is D. monticolse. 



Pupa. In addition to the generic, divisional, and subdivisional 

 characters, the apices of the front and middle femora are smooth; 

 abdominal tergite 1 is without a pleural spine, 2 with small, and 3 

 to 6 with rather stout ones; 1 and 2 are without dorsal and lateral 

 spines, while 3 to 6 have a pair of dorsal and a pair of lateral ones 

 each side; 7 and 8 are smooth, and 9 has the usual prominent pleural 

 spines. Pupal type labeled "Hopk. U. S. No. 2298." 



