496 FAMILY SCOLYTIDAE 



but the insect had tunnelled into the thick bEirk of the base of the tree, which 

 was almost as hard as wood, the gallery being either in the sapwood 

 and bark or entirely in the bark. The difficulty experienced by the 

 beetle in making its egg-gallery may have been a reason for the few eggs 

 laid. I also found evidences of the work of this beetle in this tree at Wutgyi, 

 the matured beetles having already left a tree in which the Xylotrechus was 

 just maturing. 



I have no further notes on the life history of this insect. It is 

 interesting to tind that the genus extends into Burma. 



Phloeosinus. 

 Phloeosinus zhobi, Stabbing. 



References.— Stebbing, Imi. For. Mem. Zool. Ser. i, pt. ii, p. 6 ; id. Chilgoza Bark-Bor. Beet. Zhob, 



Ind. For. Bull. no. 3, p. 13 (1905)- 



Habitat.— Zhob, Dera Ismail Khan (SuHman Mountains). 

 Tree Attacked.— Chilgoza Pine {Pinus gerardiana). Shinghar, Zhob; 

 Takht-i-Suliman. 



Beetle— 2 Oblong, cylindrical, black, the thorax and elytra with at times a reddish tinge. 

 Head black tinely and closely pitted, sparsely covered with a few tine short white hairs. 

 Fives reniform, with the anterior margins straight. Antennae yellow, 

 Description. funiculus four-jointed and club with four articulations. Thorax con- 



stricted in front at upper third, finely and densely pitted, with a sparse 

 white pubescence over it. Elytra striate-punctate, with a row of deep punctures down the striae, 

 the intervals being convex with fine punctures ; in apical fourth the large punctures disappear 

 and the striae are very faint ; the apex is set with spiky protuberances or teeth which extend 

 laterally up the sides ; the elytra are covered with a scattered white pubescence denser at sides 

 and in apical portion. Under-surface black, with long stiff sparse hairs ; finely pitted. 

 Abdominal segments narrow. Legs reddish brown, covered with sparse yellow hairs ; tarsi 

 yellow ; tibae armed with four teeth on outer edge and terminating in a longer tooth on inner 

 upper edge. Length, 1.9 mm. $ smaller than J, elytra reddish, the white pubescence being 

 absent. Apex of elytra with fewer teeth. Length, 1.5 mm. PI. xlviii, figs, za and 2d, shows 

 dorsal and side views of the female and male beetles. 



Egg.— Blunt elliptical in shape, white and translucent (see fig. 2). 



This small beetle was found accompanying Polygyaphus trenchi (p. 510) 



in its attacks on chilgoza-trees in North Zhob in 1905. 



Life History. Although by itself perhaps not so serious a pest as the 



latter, it nevertheless occurs in considerable numbers in 



the trees. A noticeable fact about this insect, and one perhaps not without 



importance, is that it will attack and lay eggs in trees which have become too 



dry for the Polygraphus. I do not mean that the trees are dead ones. Neither 



beetle will touch a dead tree, but the Phloeosinus will lay eggs in trees in 



which a generation of the Polygraphus is just maturing and emerging, although 



none of these latter insects will oviposit in the tree, the bark having become 



too dry to yield the necessary food for their larvae. As an example of this, 



tree No. 3 (see p. 512) may be instanced. Here the Polygraphias was found in 



all stages of full-grown larvae, pupae, and immature and mature beetles ; 



