Mr. J. Walton on the genm Trachypliloeus. 219 



Museum and of the Entomological Society a series of specimens 

 to illustrate the varieties of this insect. 



Frequently found, but not plentifully, on Hampstead Heath, 

 Plumstead, Charlton, Birch Wood, &c., generally in sand-pits, 

 sandy banks or gravel-pits in June. 



2. Trachyphloeus Waltoni, Schonh. 

 — ventricosus, Staph., non Germ. 



Ovate, black, densely clothed with griseous and cinereous re- 

 cumbent scales, and with white erect scales. Head short, de- 

 pressed, deeply striated and ridged above, beneath, and at the 

 sides, not punctulated ; eyes small, round and prominent ; rostrum 

 rather narrower and scarcely longer than the head, rugulose, 

 deeply excavated above, With a slender channel in the middle, 

 which extends to the front of the head. Antennae rufo-ferrugi- 

 nous. Thorax broader in the middle than long, considerably nar- 

 rowed, but not constricted anteriorly, the anterior margin flat, 

 greatly dilated and rounded at the sides towards the base, convex 

 above, finely carinated, neither furrowed nor foveolated, thickly 

 punctulated, the punctures confluent. Elytra ample, globose- 

 ovate, very convex above, regularly punctate-sulcate, the punc- 

 tures large and deep, the interstices narrow, convex and coria- 

 ceous, densely clothed with cardiform, recumbent griseous scales, 

 variegated with cinereous behind the middle, and with claviform 

 erect white scales ; the cardiform scales under a microscope are 

 beautifully and distinctly striated and ridged. Legs rather short, 

 robust, fusco-ferruginous, clothed with griseous and cinereous 

 scales ; the anterior tibia at the apex externally and in front un- 

 armed. Length 1^ to If line. 



This very distinct species may readily be known by the longi- 

 tudinal striae and ridges which surround the head ; the deep sulci 

 with large punctures on the elytra ; and the want of spines at the 

 apex of the anterior tibia, externally and in front. 



I forwarded specimens of this insect to Schonherr and Germar 

 as Tr. ventricosus of Germ. ? — the former observed " non ventri- 

 cosus of Germ., Waltoni of Schonh.'^ * — the latter remarked, 

 " Tr. ventricosus of Steph. is difi'erent from 7>. ventricosus of 

 Schonh., and is a distinct species, which Schonherr will describe 

 in his ^Supplements as Tr. Waltonif.'' 



Rare, occasionally found in a gravel-pit on Plumstead Common, 

 and at Shirley Common by Mr. S. Stevens and by myself in June 

 and July ; found under a stone near Bridgenorth, Shropshire, by 

 Mr. Marshall ; south of Ireland by Mr. T. V. Wollaston. 



* Syn. Ins. Suppl. vii. p. 115. 



t Germ. Stettin Ent. Zeit. 1842, p. 102. 



16* 



