HAllPALID.^i. — TIIECHUS, 167 



two basal joints alone naked: head ovate: thurax cordate-truncate, angles 

 mostly rounded : body subconvex, ovate : elytra entire, as long as the body : 

 luings two, ample : anterio?^ and intermediate tarsi of males dilated. 



Trechus, even in its present restricted state, embraces some very- 

 dissimilar forms, and consequently requires subdivision ; the species 

 may, however, be distinguished from all the foregoing Harpalidaj 

 by the acute termination of the last joint of the palpi, and from 

 Blemus by the less elongate and more convex body, as well as by 

 the obtuse posterior angles of the thorax. The species mostly fre- 

 quent damp and gravelly places, by the sides of ponds or banks. 

 De Jean places several of the species in the former genus; but the 

 acute palpi obviously remove them therefrom. 



A. With the body more or less convex. 

 a. The posterior angles and sides of the thorax romided. 



Sp. 1. dorsalis. Plate IX. f. 4. — Niger, nitidus, elytris striatis pallidis, plagd 



lanceolatd nigrd, thorace nigro, lateribus pallidis, postics utrinque foveCt suh- 

 punctatd. (Long. corp. l| — 2 lin.) 

 Ca. dorsalis. Fabricius. — St. dorsaUs. Steph. Catal. p. 34. JVo. 318. 



Glossy black; thorax generally with the disc black, the lateral and hinder 

 margins more or less pale testaceous, with a slight dorsal channel, near the 

 base on each side a broad, rather deep, obsoletely pimctate fovea : elytra pale 

 testaceous, with a broad glossy black or violet dash on each near the suture, 

 striated, the striae impunctate, the margin with an irregular series of im- 

 pressions : legs testaceous brown : antenna fuscous, with the basal joint tes- 

 taceous. 



This insect varies much in colour, the thorax being sometimes found imma- 

 culate, the spot on the elytra is occasionally nearly obliterated, and the hinder 

 tibiae occur with their apex dusky, 



" Wandsworth-common and Copenhagen-fields, in the spring, 

 at the roots of grass in gravelly banks by the sides of ponds." — 

 Messrs. Ingpen, WaterJiouse, and Westwood. " Marshes near 

 Fakenham." — Rev. T. Skrimshire. 



Sp. 2. parvulus ? Niger, thoracis limbo, elytris pedibus palpis antennarumquc 



basi pallide testaceis. (Long. corp. if lin.) 

 Tr. parvulus, Sturm ?— St. parvulus. Steph. Catal. p. 34. No. 319. 



Rather less than the last : head black : thorax with the disc black, the margins 

 entirely pale testaceous, the dorsal Une rather deep, the base on each side with 

 a slight fovea : elytra pale testaceous-yellow, simply striated : legs pale tes- 

 taceous : antennae fuscous, with the three basal joints testaceous. 



Probably a small variety of the preceding, with the elytra immaculate. 



Found, though rarely, in damp places near London. 



