pine, the cases are rather rare, its depredations being con- 

 fined almost entirely to Jeffrey pine. The adult is black 

 or nearly black when mature and slightly larger and nore ro- 

 bust than Dendroctonus monticolae. The egg or main galler- 

 ies which resemble those of the latter species are vertical, 

 the larval galleries radiating from the egg galleries and the 

 pupal chamber being located at the terminal of the gallery. 

 The whole design is slightly more regular and better defined 

 than that of D. monticolae. The eggs are laid in the sawdust 

 on the margins of the egg gallery and the exit holes are few 

 in number, many adults using the same exit hole. 



Peeling the bark will always expose the larvae, 

 pupal and adults as they are always found in the inner bark. 



This species may then be told by the host tree 

 vhich is almost always Jeffrey pine, by the vertical galler- 

 ies, the larval galleries in the cambium and the few exit 

 holes. It is also the only Dsndroctonus, except D. valens, 

 attacking the Jeffrey pine. 



DEMDROCTONUS VALENS. LEG. 

 (The Red Turpentine Beetle.) 

 Hosts - All pines . 



The attacks of this beetle are almost alv/ays at 

 the base of the tree. It has not been found above 20 feet 





-27- 



