FAMILY SCOLYTIUAE 



583 



Xyleborus perforans, Wollaston. 



References.— VVollaston, Cat. Col. Mader. 96, $ $ (1S57) ; Blandford, Bull. Roy. Bat. Gardens, 

 Keiii (Sept. i8go) ; Xyleborus sp., Stebbing, Depart. Notes, i, 406. 



Habitat.— Siwaliks, N. India; Goalpara, Assam; Tharrawaddy Forests, 

 Lower Burma ; Mysore. Also reported from Bombay, Calcutta, Rangoon. 



Tree and Wood Attacked. — Sal {Shorea robusta) : Siwaliks and Goalpara : 



Auogcissiis latifolia: Kadin Bilin, Tharrawaddy; Areca catechu: Mysore; 

 Beer-casks. 



Beetle.— Elongate, cylindrical. Red-brown. Head punctate, with a brush of hair over 

 mouth. Prothorax semi-cylindrical, longer than broad ; base truncate, the basal angles 

 rounded, apex strongly rounded ; anterior fourth with close trans- 

 Description, verse asperities, becoming less defined but continued to middle on 

 sides, rest smooth, punctate, more closely so on sides ; a sparse 

 covering of spiny hairs anteriorly. Scutelluni transverse. Elytra wider than prothorax 

 behind, about half as long again, humeral angles rounded, sides slightly widened from behind 



Fig. 366. 



Xvlebonis pt'rforatis, Well. 



in A/iOi^f/ssus latifolia. 



Tharrawaddv. 



Fig. 367. 



Xyleborus perforans, Woll. 



in Atiogeissits latifolia. 



Tharrawaddy. 



Fig. 368. 



Xyleborus perforans, Woll. 



in Areca catechu. 



Mvsore. 



humeral angles to anterior fourth, thence rounded to apex; punctate, the punctures rather large 

 and shallow ; apical portion strongly but obliquely declivous and flattened and set with small 

 pointed tubercles : the apical portion clothed with long sparse spiny yellow hairs. Legs red 

 with sparse spiny hairs. Length, 1.9 mm. to 2.4 mm. 



This little Xyleborus has a wide distribution in the country and appears 



to infest a number of timber species. 

 Life History. In North India the beetle appears on the wing to- 



wards the end of April, this being in all probability the 

 first generation of the year. The beetle tunnels down into the wood of the 

 sal-tree and lays its eggs there. It usually goes straight into the wood ; but 

 at times, after reaching a certain depth in the sapwood, the beetle turns 

 and carries the gallery at right angles to its former direction. If the 

 bark is still on the log, this gallery may go through the bark in this 

 manner instead of in the sapwood. It is carried for about a couple of 

 inches, and then the beetle again changes the direction and bores down 

 into the heart-wood. The insect does not appear to confine itself to fresh 

 bark or wood for its operations, but at the same time I have not found it 



