358 MANDIBULATA. C'OLEOPTERA. 



maxillary (a) with the terminal joint lanceolate-acuminate, labial (b) with 

 the second joint short, acute: /aZ»r2»« (c) transverse, entire: mandibles (d) 

 acute, simple: 772e7i?«7« (Z»,*) subelliptic : Amt/ triangular : ^-yej lateral, he- 

 mispheric : thorax rounded and narrowed anteriorly and posteriorly, a little 

 notched in front: body o\Aong: legs shovi ; femora linear, convex above; 

 tibicB slightly thickened at the apex, slightly spinulose without, and with two 

 short spines at the tip ; tarsi pentamerous, simple. 



Acidota was the name formerly given by Mr. Kirby to the Oma- 

 lidas generally : when, therefore, I subdivided the family in my Sys- 

 tematic Catalogue, I retained this name for the present genus, the 

 other genera having been either previously named by Mr. Kirby, or 

 others, in the interim of the first application of the present name and 

 the period of publishing the Catalogue ; and as Acidota is similarly 

 employed by Mannerheim, I still retain it here. The only known 

 indigenous species appear to reside in decaying trees, beneath the 

 bark, and are apparently scarce, at least within the metropolitan dis- 

 trict. 



Sp. 1. crenata. Plate xxvi. f. 6. a — d. Nigra, nitida, thoracis lateribu.s, 

 elytris (^punciato-striatis) pedibusque brunneis. (Long. corp. S^ — 3 lin.) 



Sta. crenatus. Fabricius. — Ac. crenata. Steph. Catal. 298. No.. 3284. 



Shining-Z>/acA;, glabrous : head punctured, twice as narrow as the thorax, 

 with a transverse furrow behind : thorax very thickly and finely punctulated, 

 moderately convex, margined on both sides, the margins brown : elytra 

 longer than the thorax, brown, punctate-striate, the interior stria most dis- 

 tinct, slightly margined, the outer apical angles rounded, and the inner 

 acute : abdomen rather longer than the elytra, the apex acumhiated : legs 

 brown: antennae reddish, pilose. 



This insect, I believe, has been taken near London, and also in 

 Norfolk : but it appears to be more abundant in Scotland, having 

 been found in the neighbourhood of Edinburgh, the Grampian Hills, 

 &c. " Taken in Caithness by Mr. Mac Leay." — Kirhy MSS. 



Sp. 2. rufa. Jlufa, nitida, thorace suhfoveoluto, elytris puncto-substriatix. 

 (Long. Corp. 1§ — 2§ lin.) 



Om. rufum. Gravenhorst. — Ac. rufa. Steph. Catal. 298. No. 3285. 



Red, shining, very glabrous, punctured above throughout : head triangular, 

 longitudinally elevated in the middle : eyes black : thorax somewhat cor- 

 date-quadrate, with the sides margined, and near the margin a large im- 

 pressed fovea, the disc with two obsolete longitudinal grooves towards the 

 hinder part : elytra scarcely twice the length of the thorax, somewhat punc- 



