DORCUS. 



91 



^. Unknown. 



Lcmjlh, 18 mm. ; breadth, 7-5 mm. 



Bhutan {L. Durel). Bengal : Kuisc-ong (Bius.scLs Mu.sfum). 

 Type in the British Museum ; that of sulcatipennis in 

 tile Oberthur collection. 



.'}0. Dorcus derelictus. (Plate IX, lig.s. 3, 4.) 



Dorcuti derelictus Parry,* Proc. Eiit. Soc. Loud. 18(53, jj. Ill'; 



Trails. Ent. Soc. Lond. 1864, p. 50 ; ojJ. cit. 1870, p. 92, pi. 2, 



fig. 3 ; Boil., op. cit. 1913, p. 254. 

 Durelius derelictus Houlb., Insecta, \', 1915, p. 92. 



Black, smooth and shining in both sexes, with the head 

 opaque. Rather elongate, with fairly slender legs and short 

 mandibles in both sexes, wliich are similar, but the female 

 with a pair of strong sharp tubercles upon the head, the male 

 with the pronotum sharply angulate at the side and contracted 

 behind. The head broad in front, contracted behind the 

 eyes, which are very small. The pronotum smooth and sliining 

 in the middle, coriaceous and dull at the sides. The front 

 margin rather prominent in the middle, tlie front angles blunt, 

 tlie sides gently rounded to the lateral angle and almost 

 straight to the base. The elytra densely punctured at the 

 sides with a shallow longituduial depression beliind each 

 shoulder, the shoulders not sharply angular. The lower 

 surface rather shining. The prosternum elevated behind but 

 scarcely compressed or pointed. Only the middle tibia bears 

 a lateral spine. 



9- The head is closely rugose except in the i:)osterior part 

 and the anterior part is a little hollowed. A pair of sharp 

 tubercles placed at the hind margin of the hollowed part 

 project forward a little. The numdibles are narrow, very 

 acute, uniformly rounded externally and have a rather sharp 

 internal tooth. The pronotum is broad and very shining, 

 except at the sides. The elytra are very shining upon the 

 inner half and densely punctured and opacjue upon the outer 

 half and at the end. The front tibia is slender, finely toothed 

 laterally, curving slightly outwards at the tip and terminating 

 in four lobes, two short ones above and two longer ones 

 beneath. 



(^. The head is closely granular, the front angles are very 

 obtuse and the canthus extends past the middle of the eye. 

 The mandibles are ver}' little longer than those of the female, 

 less rounded externally, abruptly dilated internally just 

 beyond the base, serrate at the inner edge and acutely produced 

 at the tip. The pronotum is not broad and is rather narrow 

 at the base. The elytra are minutely granular, sparsely upon 

 the imier part and closely at the sides, where. Iiowever, they 

 are not opaque. 'J'he lee/s and antenna' are a little longer 



