232 Mr. J. Walton on the genus Trachyphloeus. 



Readily distinguished from every other species except T'r. Wal- 

 toni by having the anterior tibise in both sexes unarmed at their 

 apices externally and in front. 



I may refer to the cabinet of Mr. S. Stevens for a good series 

 of specimens of this insect with several interesting varieties. 



Rather rare, occasionally found on sandy banks on Windmill 

 Hill, Gravesend; also near Birch Wood, and Bishop's Wood, 

 Hampstead, in June. 



5. Trachyphloeus alternans, Schonh. Sjm. Ins. ii. p. 493. 



Ovate, black, densely clothed with recumbent cinereous-ochra- 

 ceous scales (generally incrusted with earth), and very sparingly 

 with short, suberect scales. Head short, broad, thickly and mi- 

 nutely rugose-punctate ; eyes small, semiglobose ; rostrum almost 

 as broad, and rather longer than the head, concave above, rugu- 

 lose-punctate, and finely canaliculated in the middle, xlntennse 

 obscure testaceous. Thorax short, transverse, narrowed and trans- 

 versely impressed in front, the anterior margin elevated, greatly 

 dilated and rounded at the sides, a little convex above, closely and 

 minutely rugose-punctate, interspersed with scattered small tu- 

 bercles and not furrowed. Elytra ample, ovate, convex above, 

 distinctly punctate-striate, the alternate interstices slightly raised, 

 minutely granulated, and clothed with a series of short, very re- 

 mote, suberect scales. Legs stout, obscm*e testaceous, the ante- 

 rior tibia in both sexes armed with a short spine near the apex 

 externally, and acutely bidenticulated in front. Length 1^ line. 



This insect is closely related to Tr. spinimanus, but is suffi- 

 ciently distinct, and may be discriminated from that species by 

 having the elytra deeply and distinctly punctate striate, the 

 alternate interstices, elevated and clothed with suberect scales, 

 and by the spinous appendages at the apex of the tibia being 

 much smaller. 



According to Schonherr, TV. alternans is synonymous with Tr. 

 scaber {scabriculus of Linn.*), but I possess specimens of Tr. al- 

 ternans from Chevrolat and Gemiar which are beyond all doubt 

 difi^erent from scabriculus of Linn., and a distinct insect. 



Found rather plentifully in the sand-pits near Charlton Church 

 in June and July ; Brighton, Arundel, and in other chalky di- 

 stricts, Mr. S. Stevens. 



6. T. spinimanus, Germ., Steph. secund. ejus descr. 



The forms of the thorax and elytra of this insect differ from 

 Tr. alternans, but are easier seen than expressed ; it may however 

 be distinguished by having the elytra very faintly punctate-striate, 



* Syn. Ins. vii, p. 117. 



