THE GENUS DENDEOCTONUS. 



141 



Male type: Length, 6.5 mm. Agrees with female, except that the 

 elytral declivity is more shining and the interspaces are more dis- 

 tinctly punctured and less rugose. 



Type labeled " $ type," otherwise same as female. 



Variations. — The length varies from 5.4 to 6.5 mm., with the aver- 

 age about 6 mm.; the head, thorax, and ventral segments are dark 

 reddish brown to black, while the elytra are light to dark red. The 

 greatest variation noted in the few specimens under observation is in 

 the size, with less variation in sculpture and vestiture than in species 

 Nos. 14, 15, and 17. 



Distinctive cliaracters. — The characters which serve to distinguish 

 this species from D. rufijjennis, to which it is more closely allied, are 

 its slightly smaller size and more distinctly impressed el3^tral stri^ 



Fig. 86. — Dendroctonus murrayanx: Distribution map. (Original.) 



on the dorsal and lateral areas and the finely, densely punctured 

 interspaces of the declivity in the male. 



It appears that this species has not been referred to in literature. 



The pupa has not been observed. 



Larva (PI. VIII, fig. 19). — In addition to the generic, divisional, 

 and subdivisional characters, the front has an impression toward the 

 anterior angles and a faint transverse elevation in front of the middle. 

 The clypeus is longer than the labrum and marked with a median 

 groove, and with the apex broadly emarginate; labrum with apex 

 faintly emarginate, and the mandibles with distinct dorsal impres- 

 sion. Larval type labeled ''Hopk. U. S. No. 2690c." 



Galleries. — Only fragmentary specimens of the galleries have been 

 observed, but they appear to come between piceaperda and valens, 

 the larvae, for the most part, excavating a common chamber. 



