444 RaYNCHOPHORA. [Pittjogenes. 



Male with the apex of the elytra strongly inflexed and with the 

 internal margin of the excavation of the elytra bordered with slight 

 setigerous crenulations. 



Under bark of firs and pines, especially in dead fir branches ; local, but not uncom- 

 mon in many districts and widely distributed ; London district, not uncommon, 

 Esber, Horsell, Weybridge, Shirley ; Hastings district ; Holm Wood : Glanvilles 

 Wootton ; Chat Moss; Eobins Wood, Kepton; Lincoln; Northumberland and 

 Durham district ; Scotland, common in bark of fir logs, Solway, Tweed, Forth, Clyde, 

 Tay, Dee and Moray districts. 



P. quadridens, Hart. Very closely allied to the preceding, of 

 which it has by some authors been regarded as a variety ; it is, how- 

 ever, smaller on an average, and may be distinguished by having the 

 punctuation of the thorax finer and more scattered, and by the finer 

 pubescence of the elytra and the feebler rows of punctures on their 

 disc ; the body behind thorax is two and a half times as long as broad ; 

 the male has four distinct teeth at the apex of the elytra, two at the 

 summit of the apical declivity which are large and hooked and two 

 rather more than halfway down it, but not as far down as the apex ; 

 the border between these two teeth is not crenulate and is quite devoid 

 of setigerous tubercles, which are always present in P. bidentatus ; the 

 female has four small tubercles in the situation of the male teeth. 

 L. lf-2 mm. 



Under bark of pine ; rare 5 Scotland, Tay, Dee and Orkney districts ; Kannoch 

 (Turner); Orkney (Sy me). 



THYPODENDRON, Stephens (Xyloterut, Er.). 



This genus contains about a dozen species which are almost confined 

 to the Northern hemisphere and have chiefly been described from Europe 

 and North America ; one or two appear to be somewhat doubtful ; a 

 single species is recorded by Wollaston from the Canary Islands ; they 

 are small cylindrical insects, with the head and thorax more or less 

 dark, and the elytra testaceous, with or without longitudinal dark bands, 

 and almost glabrous except towards apex ; they may be known by 

 having the eyes entirely divided and the club of the antenna without 

 sutures; the funiculus is four-jointed; the scutellum is moderately 

 large, and the second abdominal segment is rather long ; the males have 

 the forehead excavate and the thorax transverse, whereas in the female 

 the forehead is convex and the thorax almost globose ; the perfect 

 insects bore circular galleries perpendicularly into the limbs of fallen 

 trees, appearing to prefer the hard and solid wood ; they are, in con- 

 sequence, somewhat difficult to obtain ; they may be seen sitting with 

 their heads just projecting from the galleries, but at the least alarm 

 they drop back into them. The three British species may be divided as 

 follows : 



