4<, 4 FAMILY SCOLYTIDAE 



thorax, not quite twice as long as latter, conjointly emarginate at base, basal borders crenate, 

 basal angles strongly rounded and sides rounded from base to apex. Almost black, with a dull 

 reddish tinge on them ; striate, the striae deep and prominent, but not reaching to base of 

 elytra, shining, flat with scattered punctures, the interstices slightly elevate and convex, coarsely 

 rugose-punctate. U nder-surface black, with a scattered yellow pubescence; abdominal segments 

 i and 5 large and equal to one another, 2, 3, and 4 much narrower, punctate with sparse yellow 

 hairs on them. Length, 3 mm. (Figs. 2, 2a, pi. xlv, show a dorsal and side view of this beetle.) 



Larva. Small, white, oval. Very convex above, and much corrugated and channelled. 



Length. 4 mm. (fig. i). 



Very little is known upon the subject of the life history of this bark- 

 borer. I took nearly full-grown larvae in their galleries 

 Life History. j n the tree towards the end of May 1908, these being 

 the larvae of the first generation of the year. The 



beetles mature about the first or second week in June. The number of genera- 

 tions of the insect in the year has yet to be ascertained. It is possible 

 that it has at least three life-cycles in a season. It is important that this 

 fact should be definitely and accurately determined. Fig. 3 in pi. xlv shows 

 ' a diagrammatic view of the egg and larval tunnels made in the sapwood 

 and bast by this insect. The damage it is capable of doing to the tree 

 and the methods of combating its attacks are similar to those detailed 

 for the Dryocoetes bark-borer (p. 548) of this oak. 



Sphaerotrypes macmahoni, Stebbing. 



REFERENCE Stebbing, Ind. For. Mem. Zool. Ser. vol. i, pt. ii, 16 (1909). 



Habitat. Suliman Mountains, Baluchistan, and Dehra Ismail Khan. 

 Tree Attacked. Olive (Olea cuspidata) . Sangar Scallon, Suliman 

 Mountains (Elev. approx. 7,000 ft.). 



Beetle. Elongate, globular, very convex above. Dull black or brownish black. Easily 

 distinguished by the presence of what appears to the naked eye as an X-shaped marking of 



whitish-grey pubescence, the upper arms (which coincide with basal 

 Description. margin of elytra) and lower arms (which are situated a little below 



middle of elytra) of the X being short, and the vertical portion of 



the letter elongate. The flat front of the head, the under-side of the thorax, and the abdominal 

 segments densely clothed with a short dense grey pubescence. Prothorax punctate, the longitu- 

 dinal median line fairly prominent and ending in a raised elevation behind. Rather densely 

 covered with longish grey hairs, shorter and less dense on disk ; the posterior margin thickly 

 set with a short very dense greyish pubescence which forms the upper arms of the letter X- 

 Elytra slightly wider than thorax, not twice as long. Easily distinguishable from the 

 other four Indian species 1 have described by the finer striae, the interstrial spaces much more 

 finely rugose and covered with a fine short stiff grey-brown or black pubescence. The basal 

 third of the suture is set with a very dense short grey pubescence which curves outwards and 

 downwards from a point about a third up the suture from the base, forming a grey band which 

 reaches the outer margins two-thirds up from the base (forming the vertical portion and the 

 lower arms of the X)- The outer shoulders as also the apical portion of the elytra are also set 

 with this grey pubescence. Under-surface covered with a dense yellow-grey pubescence. 

 Antennae and legs reddish brown, moderately clothed with a greyish pubescence. Length, 

 2.75 mm. to 3.20 mm. 



[Elongate, convex, and corrugated above, oval, flat beneath, but slightly curved 

 and yellowish pink in colour. 



