Heteerius.'] CLAVICORNIA. 207 



one from North America ; they have a peculiar facies, somewhat like 

 that of a large Acarus, and are found in company with ants. 



H. ferruginous, 01. (sesquicornis, Preys. ; quadratus, Kug. ; Mar- 

 sculi, Schauf.). Suborbicular, smooth and shining, of a lighter or darker 

 reddish or reddish-testaceous colour ; forehead concave ; antennae with 

 solid, obconical, truncate club ; thorax short, widened behind, with the 

 sides depressed and furnished with two striae, and with a deep depres- 

 sion near posterior angles ; elytra with projecting shoulders, with the 

 four first dorsal strife entire, and with four or five rows of long yellow 

 hairs, which are scarcely visible, if viewed from above ; legs very large, 

 strongly and angularly dilated in middle, minutely denticulate on their 

 outer side. L. 2-3 mm. 



In the nests of Formica fusca, sanguinca, and flava ; very rare ; Highgate (Jan- 

 son) ; Weybridge (Power); Croydon (Douglas and Scott). 



DENDROPKIIiVS, Leach. 



The species belonging to this genus are distinguished from Hisfer by 

 the formation of the cavities for the reception of the antennae, and from 

 Carcinops and Paromalus by having all the tibiae strongly dilated ; the 

 prosternum is broad and rounded behind, and is received into a deep 

 emargination of the mesosternum ; the genus only contains about half- 

 a-dozen species from Europe and North America ; they occur under 

 bark, in rotten wood, and in ants' nests, and occasionally in dead 

 animals. 



I. Upper surface distinctly punctured, shiny D. PTTNCTATUS, F. 



II. Upper surface without distinct punctures, dull I). PTGII^US, L. 



D. punctatus, 111. Oval, suborbicular, convex, black, shining, with 

 the whole upper surface distinctly punctured ; antennae and legs ferru- 

 ginous ; thorax very short, narrowly margined ; elytra broader than 

 thorax, with the two first dorsal striae entire and very marked, the third 

 and fourth abbreviated behind, the sutural stria absent or scarcely in- 

 dicated ; anterior tibiae finely denticulate. L. 2^-3 mm. 



In dead animals, rotten wood, &c., and also in the nests of Formica fuliginosa ; 

 not common ; Greenwich, Coombe Wood, Mickleham, Richmond Park, Cobham, 

 Hammersmith, Addington, West Wickham ; Waltham Cross; Norwich; Northum- 

 berland district, Hetton Hall, near Belford (Bold) ; Scotland, doubtfully indigenous, 

 the only record being "Under bark of trees at Cramond," Murray's Cat. I feel 

 somewhat doubtful regarding Mr. Bold's record. 



D. pyg-mseus, L. (formicetorum,A.\\he). Easily distinguished from 

 the preceding by its dull appearance and the absence of any distinct 

 punctuation ; under a high magnifying power the upper surface appears 

 to be exceedingly finely punctured ; the colour is more pitchy, and the 

 antennae and legs are of a brighter red colour ; elytra with very fine but 

 distinct dorsal striae which are bounded by a slightly elevated line, only 



