520 



FAMILY SCOLYTIDAE 



The Black Bug (Hemiptera). The last of the 

 predaceous insects taken is a small, elongate, 

 narrow, flat, shining, black bug, furnished with 

 a strong, four-jointed, elongate, black pro- 

 boscis, the last segment being pointed and 

 yellowish. This projects from the top of the 

 head, which is small. The wings are mem- 

 branous and palish yellow, the upper being folded 

 across the lower. The thighs of the legs are 

 thickened and black, the rest of the legs being 

 yellowish. Length, one-eighth inch, excluding the 

 beak (vide fig. 336). 



This little bug was very plentiful in the 

 trees, and is most probably, I think, predaceous 

 upon the Polygraphus grubs, pupae, and perhaps 

 beetles. 



X12. 



FIG. 336. 



Bug predaceous upon 

 P. trenchi. North Zhob. 



Polygraphus nigra, Stebbing. 

 (The Black Polygraphus.} 



REFERENCE. Stebbing, Depart. Notes (Hylesimts ? sp.) i, 258. 



Habitat. North-West Himalaya. 



Tree Attacked. Blue Pine (Pin us c.\celsa). Jaunsar. 



Polygraphus nigra, 

 Steb. a, beetle ; l>, egg- 

 galleries in blue-pine 

 bark. North-West 

 Himalaya. 



Beetle. Cylindrical, black, mode- 

 rately shining, head and thorax punctate, 

 elytra striate and pitted. Head short, 

 vertical ; finely rugose behind, with a 

 few punctures anteriorly, pubescence 



yellow, stiff; 



Description. antennae brown. 



Prothorax slight- 

 ly convex, half as wide again at base 

 as anteriorly; punctate, the punctures 

 large, deep, numerous ; a median longi- 

 tudinal smooth line not reaching to .in- 

 terior margin. Elytra rounded at their 

 posterior declivity ; nearly twice as 

 long as prothorax, longer than wide, 

 slightly dilated at apex, moderately dull, 

 with close scales ; striae faint ; pubes- 

 cence short, whitish yellow. Legs fairly 

 stout, with largish tibiae ; dark ferru- 

 ginous. Tarsus yellowish brown. Length, 

 3.2 mm. Fig. 337, a, shows a dorsal and a 

 side view of this insect. 



Larva. Pinkish yellow in colour, 

 broadest anteriorly, corrugated and curved. 

 When first hatched, yellow. 



