HAIIPALID^. — SYNUCHUS. — CALATHUS. 97 



series of dots on the margin : body beneath rusty-piceous : legs and antennae 

 pale testaceous : palpi rufescent. 



I obtained a single specimen of this insect from Mr. Marsham's 

 collection, but I am totally ignorant of its locality : it is readily 

 known by its smaller size, and by being apterous. 



Genus XXXVII. — Synuchus, Gyllenhdl. 



Palpi moderate; external maxillary with the last joint elongate-cylindric, 

 obtusely truncated; labial with the terminal joint securiform, the apex 

 obliquely acuminated : labrum transverse, entire : mandibles acute, bent, den- 

 ticulated at the base : mentum with an acute triangular tooth in the centre 

 of its notch. Antennae linear; the third and terminal joints nearly of equal 

 length: head oblong: thorax nearly orbicular, emarginate anteriorly, with 

 the posterior angles rounded: body rather convex: elytra rounded at the 

 tip : wings two : claws serrated : anterior tarsi of males with three dilated 

 joints. 



Synuchus differs from Odontonyx and Calathus by the form of 

 the terminal joint of the labial palpi ; from the latter genus also 

 by the simple tooth in the centre of the notch of the mentum, and 

 by the rotundate thorax. 



Sp. 1. vivalis. Niger nitidus, antennis pedibusque rujis, elytris striatis, striis 



impundatis. (Long. corp. 3^— 4lin.) 

 Ca. vivaHs. Illiger. — Sy. vivalis. Steph. Catal. p. 20. No. 153. 



Somewhat resembling the two last species, but readily known by its black 

 colour, exclusively of its generic differences : it has the head smooth glossy 

 black, with a transverse impression between the eyes : mouth, palpi, labrum, 

 and antennae rust- colour : thorax slightly convex, shining black, smooth, the 

 edge reddish ; a slight dorsal channel, and a deep impression on each side at 

 the base: elytra a little convex, glossy black or pitchy, rather strongly 

 striated : the striae impunctate, with two or three remote impressions on the 

 disc between the second and third from the suture, and a slightly interrupted 

 series on the margin : body beneath smooth glossy piceous : legs reddish. 



It varies in having the margin of the elytra and the suture rufescent. 



Not a very common species : I have occasionally taken it near 

 London, in damp banks, at Coombe and Darenth-woods, and near 

 Hertford ; it also occurs, but sparingly, near Bottisham, and near 

 Netley, Salop ; and, I believe, in Norfolk. 



Genus XXXVIII. — Calathus, Bonelli. 



Palpi rather long ; external maxillary with the terminal joint cyUndric, trun- 

 cated ; labial nearly filiform, the two last joints slightly clavate, the terminal 

 truncate : labrum transverse, a little emarginate : mandibles denticulated at 



