96 MANDIBULATA. — COLEOPTERA. 



Genus XXXVI. — OD0NTONYx*?wiAi. 



Palpi rather elongated^ the terminal joint fusifoma, acuminated at the tip, 

 scarcely truncate : labrum quadrate^ transverse, entire : mandibles acute, bent, 

 denticulate at the base : mentum emarginate anteriorly, with an acute trian- 

 gular tooth in the centre. Antennas filiform, the third, fourth, and terminal 

 joints nearly equal : head elongate : thorax nearly orbicular, deeply emarginate 

 anteriorly, the posterior angles rounded : body slightly convex : elytra with 

 the apex a little obHquely truncated : wings two or none : claws denticulated : 

 anterior torit of males with three dilated joints. 



Odontonyx, Synuchus, and Calathus are distinguished from tlie 

 other indigenous Harpalidse by having the claws denticulated, as 

 in several of the Brachinidse : the former genus is discriminated from 

 the two last by the attenuated terminal joint of the maxillary palpi, 

 and from Calathus, in addition, by having the central lobe of the 

 mentum unindentate. 



Sp. 1. rotundatus? Plate VI. f. 2. — Fusco-ceneus, subtus rufo-piceus, antennis 



pedibusquejlavescentibus. (Long. corp. 3 — 3^ Hn.) 

 Ca. rotundatus. Paykul ?—0d. rotundatus. Steph, Catal. p. 19. No. 151. 



Head very glossy, smooth, dusky-bronze : thorax with the disc convex, pitchy me- 

 tallic-black, obsoletely wrinkled transversely, with a deep longitudinal channel; 

 the lateral and posterior margins thickly punctated, with an obsolete depres- 

 sion towards the hinder angle : elytra oblong-ovate, a little convex, glossy me- 

 tallic-brown, striated, the striae impunctate, with three impressed dots between 

 the second and third from the suture, and a slightly interrupted series on the 

 margin : body beneath reddish-brown, rather glossy : legs yellowish : antennae 

 the same at the base, dusky at the tip : mouth pitchy-red : palpi pale at the 

 base, dusky towards the apex. It varies a httle in size and colour. 



Occasionally found in corn-fields, under stones and dead leaves 

 throughout the metropolitan district; I have also found it near 

 Barham, Suffolk : it likewise occurs in Shropshire and Norfolk. 



Sp. 2. rotundicoUis. Apterus, piceo-ferrugineus, elytris dilutioribus, antennis 



pedibusque testaceo-pallidis . (Long. corp. 2| lin.) 

 Ca. rotundicoUis. Mar sham. — Od. rotundicoUis. Stcph. Catal. p. 9,0. No. 152. 



Similar to the last, but smaller and apterous : head dusky, smooth : thorax rusty- 

 piceous, obsoletely channelled down the centre, and slightly punctulate on 

 the sides and posterior margin : elytra pale rusty-piceous, obsoletely striated, 

 the striiE impunctate, with three impressions on the disc, and a continuous 



* oSav dens, owl unguis. 



