498 FAMILY SCOLYTIDAE 



fore, it inav be said that this insect, whilst preferring the bast layer in a drier 

 but still living condition, will when pressed bore into and lay in green 

 healthy trees. In the latter case it is evidently more easily killed by the 

 resinous exudation than is the Polygraphus. 



The damage done to the trees and the methods of preventing it, as 

 also predaceous foes, are similar to those described under Polygraphus trenchi 

 on p. 517. 



Chramesus. 



Chramesus globulus, Stebbing. 



Referexce. — Chramesus? sp. Stebbing, Depart. Notes, i, 409 (1906J ; id. Ins. Pests Himn.!. Oaks, Ind. 



For. Rec. ii, pt. 21 (igog). 



Habitat. — Jaunsar, North-West Himalaya (5,000 to 5,500 ft.) 

 Tree Attacked. — Ban Oak {Qiiercus incana). Jaunsar. 

 Beetle. — Small, globular, very convex above, flat beneath, widest across middle. Head 

 small, black, \\ith a yellowish brush of hair on forehead. Prothorax black, pentangular in 

 shape, anterior margin straight, slightly ridged with a transverse 

 Description. depression behind the ridge, posterior margin produced baci< into a 



median point. Elytra very convex, purplish or black in colour, 

 striate, base rugose, the interstrial spaces with series of fine raised points ; the striae curve 

 i awards towards apex; surface set with a short yellowish pubescence. Under-surface flat, 

 black ; abdominal segments clothed with a short spiny yellow pubescence, denser laterally. 

 Length, 3 mm. iPl. xlv, tigs. 4, 4«, shows a dorsal and side view of this beetle.) 



The beetle first appears on the wing in the spring about the first week 



in May at elevations of 5,000 to 5,500 ft. 



Life History. It tunnels into the wood of newly dead or dying 



ban oaks for egg-laying purposes. The insect bores 



straight through the bark and into the sapwood, and then turns to one side 



or the other and carries its gallery right down into the heart-wood at an 



angle. These beetles lay the eggs of the first generation of the year. 



This is all that is at present known on the life history of this beetle. 

 It will not attack dry wood. The holes drilled in the wood are circular 

 in section. 



Tribe CRYPTURGINAE. 



Tibiae never prolonged into a hook or process at outer angle. Head 

 provided with a rostrum. Third tarsal joint simple, round. Pronotum 

 uniformly sculptured. 



The tribe includes the genus Crypturgus and the far more important 

 Polygraphus, both containing forest species in the Himalayan region. 



Crypturgus. 



Colonel F. Winn Sampson considers the following two scolytids to be 

 species of this genus, the first being C. pusillus of Europe, Japan, and North 

 America. Dr. Hagedorn, to whom the insects were submitted, expressed the 

 opinion that they represent a new genus close to Crypturgus. I have con- 

 sidered it sufficient for the purpose of this work to follow Colonel Sampson. 



