Xyleborus.} BHYXCHOPHOBA. 449 



X. dryographus, Eatz. Oblong, narrow, subcylindrical, shining, 

 clothed with rather long pale pilose pubescence, pitchy-brown, reddish- 

 brown or reddish-testaceous, with the antennae 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 stride, 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. 



Iu decaying oak and beech ; occasionally captured ou the wing ; rare, or rather 

 very local; Caterham, Surrey (Champion); Kiddlesdown, near Croydou; 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 

 gcem to imply. 



X. Saxeseni, Katz. ( $ decolor, Boield., $ suMepressus, Rev.). 

 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 Rosacese and 

 Conifers; ; very local ; London district, not uncommon ; Wimbledon, Esher, Putney, 

 Peckham, Chatham, Loughton ; Upton Bishop, New Forest. 



In 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 maxillae 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 obscurely 

 -striated longitudinally and the elytra without an impressed sutural 

 stria ; the other British genera of Dryoca-tina belong to the section 

 Phloeophagi, which may be distinguished as follows : maxillary lobe 

 (lacinia) set with a radiating series of rigid setae or compressed spines ; 

 terminal joint of palpi simple ; elytra with the sutural stria generally 

 deeply impressed ; species bark-feeding and never boring into the solid 

 wood. 



PLATYPODIN.E. 



This sub-family contains the single genus Platypus, which is separ- 

 ated from the Scolytinae by the much longer metatarsus, the emarginate 



VOL. V. G g 



