444 RUYNCHOPHORA, [ Pityogenes. 
Male with the apex of the elytra strongiy 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 ; Londoa district, not uncommon, 
Esher, Horsell, Weybridge, Shirley; Hastings district; Holm Wood: Glanvilles 
Wootton; Chat Moss; Robins Wood, Repton; 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 half way 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, 13-25 mm. 
Under bark of pine; rare; Scotland, Tay, Dee and Orkney districts ; Rannoch 
(Turner); Orkney (Syme). 
TRYPODENDRON, Stephens (Ayloterus, 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 antenne 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 :— 
