THE GENUS DENDKOCTONUS. 



101 



Host trees. — According to evidence from correspondence with 

 Professor Herrera, it would appear that this species, like D. mexi- 

 canus, attacks Pinus teocotl (?), P. lejophilla, and P. ayacahuite, 

 although there is no definite statement to that effect. It is quite 

 evident, however, that this species is associated with D. mexicanus 

 in the same manner as D. approximatus in its association with D. 

 arizonicus and D. harheri. 



Identified specimens. — Ten specimens of adults and one specimen of 

 work identified for Prof. A. L. Herrera. 



Fig. 62. — Dendroctonus jtarallelocollis: Distribution map. (Original.) 



Bibliography. 



Dendroctoniis parallelocollis Chapuis, 1869, p. 36, original description. Chapuis, 

 1873, p. 244, reprint. Blandford, 1897, p. 147, synopsis, revision, distribution, 

 bibliography. Hopkins, 1906c, p. 81, systematic notes. 



8. Dendroctonus approximatus Dietz. 



(PI. IV, fig. 8.) 



Adult. — T/pical female: Length, 6.5 mm., reddish brown; elytral 

 declivity with long hairs; head with front convex, shining, and with 

 obscure frontal tubercles each side of short, median groove; elytral 

 striae not impressed or distinctly punctured; elytral rugosities rather 

 coarse, sparse; striae on lateral area rather distinct; pronotum with 

 long hairs on anterior two-thirds of lateral area, but not on posterior 

 section. Secondary sexual characters: Pronotum with transverse 

 ridge across the anterior area; elytral declivity subconvex, shining; 



