264 MANDIBULATA. COLEOPTERA. 



nishing in length, the fourth being the longest ; the eleventh abruptly acumi- 

 nated, giving the appearance of a twelfth joint. Falpi short, comparatively 

 slender: head small, deeply inserted in the thorax, which is narrowed in 

 front, with the sides rounded ,- the posterior angles, which are robust, elon- 

 gated, carinated, and acute ; the disc very convex : eyes small : body convex, 

 attenuated behind : legs moderate; tarsi simple. 



Ludius is distinguished by the remarkable peculiarity of the 

 terminal joint of the antennae, which is so abruptly acuminated as 

 to give the appearance of a twelfth joint; the second and third 

 joints are very small, and the remainder, with the exception of the 

 basal one, very acutely serrated. 



Sp. 1. ferrugineus. Supra ferrugineus, subtus niger, thoracis margine postico 

 nigro, elytris obsolete striatis. (Long. corp. 9—11 lin.) 



El. ferrugineus. Linne. — Don. x. pi. 356. f. 1. — Lu. ferrugineus. Steph. CataL 

 124. No. 1263. 



Head black, thickly punctulate : thorax very thickly punctured, rufo-ferrugi- 

 nous, with the posterior margin and angles black, the disc sparingly covered 

 with short flavescent hairs ; scutellum black : elytra rufo-ferruginous, rather 

 obsoletely striated, the interstices very thickly and somewhat finely punctate : 

 body beneath black : antennae and legs pitchy-black ; the tip of the tarsi 

 smooth and pale obscure rufescent. 



f Var. /S. With the thorax entirely of a deep fuscous-black. 



This gigantic species is extremely rare in Britain ; it has how- 

 ever been occasionally captured within the metropolitan district. 

 " Windsor and Darenth-wood."" — Dr. Leach. " Clengre, Glou- 

 cestershire." — Rev. F. W. Hope. " Has once occurred at Bot- 

 tisham, in a decayed walnut tree." — Rev. L. Jenyns. " Taken in a 

 willow (near Swansea)." — L. W. Dillwyn, Esq, 



Genus CCXXVI. — Ctenicerus, Latreille. 



Antenna moderate, the basal joint slightly bent, robust, subclavate; the second 

 minute, subglobose; the remainder to the tenth more or less obconic, the 

 inner edge being considerably produced and acute, forming a serrated edge, 

 the apical joint elongate, acuminated; in some males the antenna? are con- 

 siderably elongated ; and the third to the tenth joints are furnished within, 

 each with a long subclavate appendage. Palpi somewhat elongate : eyes not 

 prominent : head small, deeply inserted in the thorax, which is rather elon- 

 gate, depressed, broadest behind, with acute posterior spines : body elongate, 

 slightly convex, usually adorned with rich metallic colours; attenuated 

 behind: legs slender; fore;' simple. 



