CARABID.E. — CYCHRUS. 45 



j:/7//ra deflexa,latera abdominis amplcctentia : .... IC. CvcHRus 



Ehjtra hand 

 latera abdo- 

 minis am- 

 plectentia: 



Labrum - 



' trilobatum : . . , . . I7. ProcrusTES. 



bilobatum: Antcn7icc icylmdiico : . . 18. Carabus. 



ardculo tertioK 



(compresso: . . . 19. Calosoma. 



fduffl : Palpi , articulis aequa- 

 maxillares \ libiis : . 20. Nebria. 



f AI J interui^ 



L simplex: '. ^\ iarticulo ultimo 



Palpi < I ^ loDgissimo: 21. HelobiA. 



j I nuUffi : . . .22. ALPiEirs. 



'■elongati, articulo tertio longissimo : . 23. Leistus. 



Genus XVI. — Cychrus, Fabricius. 



Labrum strongly bilobate: mandibles porrect, rather slender, internally bidentate 

 at the tip : viaxillary paljn, internal with the terminal joint depressed, suboval, 

 acuminated ; externalvfiXh. the basal joint minute, second elongated, third and 

 fourth of equal length, the latter spoon-shaped : labial palpi with the basal 

 joint or scape elongated, second short, third long and spinose, the terminal 

 spoon-shaped : labium tripartite : mentum quadrate, not toothed. Antennce 

 setaceous : thorax subcordate, truncated behind : elytra deflexed, embracing 

 the sides of the abdomen : wings none : anterior tarsi simple in both sexes : 

 palpi of male more dilated than in the female. 



The genus Cychrus is readily known by its slender attenuated 

 head ajid thorax, and by its projecting mandibles and expansive 

 broad elytra, which are reflected over the sides of the abdomen : 

 it has also two peculiar labial appendages, being slender processes, 

 arising at either side of the labium, and denticulated externally at 

 the base. 



Sp. 1. rostratus. Niger, imviaculatus, capite elongato-angusto, punctulato, elytris 

 granulato-rugosis, cainnato-angulatis. (Long. corp. 8 — 10 lin.) 



Te. rostratus. Linne. Ca. rostratus. Don, xiv. -pi. 504, /. 2. — Cy. rostratus. 

 Steph. Catal. No. 67. 



Head projecting, much elongated, narrow, black, shghtly rugose- punctate, with 

 an impression near the eyes, and an elevated line above the base of the an- 

 tennae : thorax small, oblong, anteriorly broader than the head, truncate, 

 its sides and base rounded and elevated ; above depressed, thickly rugose- 

 punctate, with a shght longitudinal channel: elytra ovate, much broader 

 than the thorax, dilated in the middle, attenuated towards the tips, and a 

 trifle acuminated ; acutely keeled on the sides with a broad inflexed mar- 

 gin ; they are very convex, entirely black, shghtly shining, and very thickly 

 granulated: the body beneath is smooth glossy black: the legs are long 

 and black : the antennee very slender, black at the base, and brownish at the 

 tip : the mandibles are rust-coloured at the tip. 



Far from an uncommon species near London, and I believe fre- 

 Mandibulata, Vol. I. 1st Septejibee, 1827. o 



