ANISOTOMIDtE. — SERICODERUS. 187 



Its smaller size and more elevated body distinguish this insect from the pre- 

 ceding and following, which it somewhat resembles in colour. 



Found in Suffolk. 



Sp. 4. truncatus. Nigro-piceus, icevis, thoracis marginibus antennis pedibusque 



rufo-testaceis. (Long. corp. T 5 o — J lin.) 

 Anis. truncatum. Kirby MSS. — Or. truncatus. Steph. Catal p. 71. No. 769. 

 Somewhat depressed, smooth; pitchy-black, the thorax glossy, with its lateral 



margins, the antennas, and legs testaceous-red ; elytra distinctly truncate at 



the apex. 

 The pale margins to the thorax and more distinctly truncated elytra serve to 



discriminate this species from its congeners. 



Found in Suffolk and near Bristol. 



Sp. 5. nigrescens. Piceo-niger, loevissimus, antennis pedibusque piceo-testaceis. 



(Long. corp. ^ lin.) 

 Or. nigrescens. Steph. Catal. p. 71. No. 770. 



Deep pitchy-black, very smooth and glossy; the margins of the thorax con- 



colorous : the antennae and legs pitchy-testaceous. 

 Smaller, and of a much darker colour than either of the foregoing, and differs 



from the last in having the margins of the thorax concolorous. 



Taken beneath rotten wood near London. 



Sp. 6. Atomos. Niger nitidus, antennis pedibusque piceis. (Long. corp. llin.) 

 •Or. Atomos. Kirby MSS.— Steph. Catal, p. 71. No. 771. 



Very minute : smooth, black, shining, with the antennae and legs piceous. 

 The smallest Rypophagous insect: known from the preceding by the greater 

 intensity of its colours, and its minute bulk. 



From the Marshamian cabinet : — taken, I believe, in Suffolk. 



Genus CXV. — Sericoderus * mihi. 



Trophi very minute. Antenna? rather elongate, slender, the three last joints 

 forming an elongate capitulum : head small, concealed beneath the anterior 

 margin of the thorax, which is slightly produced : thorax sericeous, broad, 

 subtriangular, the hinder angles somewhat acute : elytra sericeous, slightly 

 gibbous anteriorly, a little depressed behind, the apex distinctly truncate: 

 legs slender ; tarsi obscurely articulated. 



This genus is at once known from the rest of the family by its 

 truncate elytra, combined with the triarticulated capitulum of its 

 antennae, minute head, and projecting anterior margin of the tho- 

 rax, exclusively of other characters. 



* S»g/*8j, sericum ; Li^/i, collum. 



