Ayleborus. } RHYNCHOPHORA, 449 
%. dryographus, Ratz. Oblong, narrow, subcylindrieal, shining, 
clothed with rather long pale pilose pubescence, pitchy-brown, reddish- 
brown or reddish-testaceous, with the antenney and legs testaceous ; 
thorax a little longer than broad, scabrous in front, distinctly and rather 
strongly punctured behind; elytra reflexed but not excavate at apex, 
with fine punctured striz, interstices very finely and scarcely visibly 
punctured. L. 2-3 mm. 
Male shorter, with the thorax broadly concave in front and termin- 
ated on its anterior margin by a corneous projection ; apical declivity of 
elytra without, or almost without, tubercles. 
Female with the thorax simple in front; apical declivity of elytra 
without, or almost without, tubercles, as in male. 
In decaying oak and beech ; occasionally captured on the wing ; rare, or rather 
very local; Caterham, Surrey (Champion) ; Riddlesdown, near Croydon; Abbey 
Wood, Kent ; New Forest ; Monmouthshire, extremely local (Chapman) ; the male 
is very much rarer than the female ; the proportion of the sexes is given by Eichhoff 
as one to fourteen, but the males in this country appear to be scarcer than this would 
seem to imply, 
x. Saxeseni, Ratz. ($ decolor, Boield., 3 subdepressus, Rey.). 
Extremely closely allied to the preceding with which it may very easily 
be confounded, but distinguished by having the hinder part of the thorax 
almost smooth and scarcely visibly punctured, and, in the female, rather 
dull, and the apical declivity of the elytra in the latter sex furnished 
with distinct rows of tubercles arranged in longitudinal rows; in the 
male, moreover, the anterior portion of the thorax is not excavate and 
has no corneous projection in front ; the colour varies from pitchy-brown 
to testaceous. L. 2-3 mm. 
In decaying oak, beech, apple, hornbeam, and according to Bedel in Rosacex and 
Coniferz ; very local; London district, not uncommon ; Wimbledon, Esher, Putney, 
Peckham, Chatham, Loughton ; Upton Bishop, New Forest. 
Tn accordance with their affinities the genera Trypodendron and Xyle- 
borus are here placed in close connexion with one another ; they belong to 
the section Xylophagi in which the maxille are set internally with hairs 
instead of with a row of spines ; the species, moreover, are wood-boring 
and not bark-feeding, and have the terminal joint of the palpi obseurely 
striated longitudinally and the elytra without an impressed sutural 
stria; the other British genera of Dryocetina belong to the section 
Phlceophagi, which may be distinguished as follows :—maxillary lobe 
(lacinia) set with a radiating series of rigid sete or compressed spines ; 
terminal joint of palpi simple ; elytea with the sutural stria generally 
deeply impressed ; species bark-feeding and never boring into the solid 
wood, 
PLATYPODINEA. 
This sub-family contains the single genus Platypus, which is separ- 
ated from the Scolytinz: by the much longer metatarsus, the emarginate 
VOL. V. Gg 
