MANDIBULATA COLEOPTERA. 



Cillenum differs from the other Bembidiidae (excepting Lym- 

 naeum) by its linear depressed body; and from that genus it may 

 be known by the length of the third joint of the antennae, which 

 considerably exceeds that of the fourth, and by the following joints 

 being moniliform : it also differs in the proportions of the palpi, and 

 in wanting the spine beneath the antepenultimate joint of the an- 



terior tarsi. 



Sp. 1. laterale. Viridi-cupreum aut ceneum, niiidum, antennarum basi pedibusque 

 testaceis, elytris ochraceis ceneo micantibus, tenue punctato-striatis. (Long, 

 corp. 1 j — 2 lin.) 



Ci. laterale. Leach, MSS.— Curtis, v. pi 200.— Steph. Catal.p. 36. No. 342. 



Bright-copper, or aeneous, sometimes glossed with purplish : head and thorax 

 minutely punctured, the former with two frontal sulci, the latter with a faint 

 longitudinal channel: elytra ochraceous, glossed with greenish-brass, the 

 lateral margin and part of the hase excepted; slightly striated; the striae 

 obscurely punctured, and the third with four fovea on the inner side: body 

 beneath shining bronze; legs and base of the antennae testaceous; tip of the 

 latter and mouth pale-tawny. 



Taken on several of the coasts, particularly on the northern 

 coast of Norfolk. " Portobello Sands. 11 — Dr. Leach, who discovered 

 the insect in Britain. « Southend."— Rev. F. W. Hope. " Near 

 Cromer, in Norfolk."— Rev. T. Shrirnshire. 



Genus LXVL— Tachys, Ziegler. 



Palpi nearly as in Lymnaeum, but shorter, and more slender in proportion; 

 external maxillary with the second joint obscurely subclavate; the following 

 robust, subclavate, pilose ; the terminal very short, slender, acute, usually 

 deflexed; labial with the terminal joint above one-third as long as the pre- 

 ceding, slender; the latter subclavate, a little curved on one side: labrum 

 transverse, entire: mandibles short, acute: mentum emarginate anteriorly, 

 the emargination with an acute central tooth. Antenna pubescent, the basal 

 joint naked, second and fourth joints of equal length: head ovate: thorax 

 transverse, the sides rounded, entire, as wide behind as before: elytra 

 oblong ovate: body slightly convex: anterior tarsi of the males with the 

 basal joint dilated. 



The short, transverse, regularly-rounded, entire thorax, well 

 distinguishes this genus from the others of the family : it has also 

 some other peculiar characters, particularly the elongation of the 

 second joint of the antennae, which is equal in length to the fourth, 

 and thus also differs from Philochthus. 



