112 CARABID.E. PTEROSTICHUS. 



either not at all punctured, or in some individuals presents a 

 very slight punctuation ; the elytra are less wide and the sides 

 less rounded, th2 entire disk is very equally striated, but the 

 stria3 most obsoletely punctured, the inner striae being as delicately 

 marked as the outer three ; underside smooth ; legs red, some- 

 times in darker individuals pitchy black. Length 2J lines. 



This insect is extremely common everywhere and is generally 

 known among us as erythropus, but I have assigned that name 

 to the preceding species on the ground of Marsham's description, 

 " Elytra profundiuscule striata, in striis punctula plurima conspi- 

 cienda." There is a variety of this also as well as of the preceding 

 which is entirely shining black, including the antennae and legs. 



(PLATYDERUS, Stephens.} 



22. P. ruficollis : apterus, rufo-piceus ; thorace rufescente, ob- 

 longo-quadrato postice utrinque unistriato, angulis posticis 

 obtusiusculis ; elytris elongatis, subparallelis, striatis, 

 punctisque tribus impressis ; antennis pedibusque rufis. 



Carabus rujicollis, Marsham, Ent. 456. 



Platyderus ruficollis, Steph. Mand. 1. 101, et Manual, p. 30. 

 Feronia depressa, Dej. Spec. 3. 258 ; Icon. 3. 46. pi. 131. 

 Argutor depressus, Heer, Faun. Helv. 66. 



Wingless, elongate, depressed, pitchy or ferruginous. Head 

 pitchy, very smooth and shining, flattened in front and having a 

 transverse stria between the antenna, very convex behind ; palpi 

 and antennae rusty red. Thorax oblong-quadrate, the anterior 

 angles prominent, and below them the sides regularly and mode- 

 rately curved, narrowed behind, posterior angles obtuse, rufescent, 

 very smooth and glossy, having a deep dorsal furrow and a 

 strongly impressed impunctate stria on each side at the base 

 about midway between the dorsal furrow and the lateral margin, 

 the base itself being also smooth and impunctate. Elytra elon- 

 gate, rather wider than the thorax, rounded at the shoulders, but 

 with the sides somewhat parallel, narrowed however at the apex, 

 pitchy ferruginous, rather flattish, evenly and smoothly striated, 

 the strise impunctate, with three impressions on the third from 

 the suture and a series on the exterior margin ; underside smooth, 

 legs red. Length 3^ lines. 



The colour varies, probably according to maturity ; sometimes 

 the elytra are ferruginous red, in other individuals pitchy with 

 their base slightly rufous, but the thorax is always rufescent. 

 This insect was first described by Marsham under the name which 

 I have retained for it in right of priority. It is better known on 



