298 STAG-BEETLES (FAM. LUCANIDAE) 



(!)) Forma amphiodoyita : Mandibiilis capite prothoraceque paulo 

 longioribns, ad basim pluridentatis (3--5), in medio inermibus, apice 

 8--10 dentatis; cetera lit in forma telodonta. 



Long. corp. (mand. excl.) 30 mm., mand. 15 mm. 



(c) Forma priodonta : INIandibulis serratis, mandibula sinistra 

 paulo longiora ; cetera ut in forma tolodonta. 



Long. corp. CMand. excl.) 23--30 mm., mand. 6--10 mm. 



9 : Elytroriim color ut in mare; prothorax et caput nigrobrunneo- 

 metallicum, valde punctatum; labro pnnctatissimo. Mandibulis supra 

 et infra denticulo instructis, punctatis, supra canalieulatis. Protho- 

 racis lateribus fortiter punctatis. Elytris punctatis; Pedibus nigris ac 

 ut latu!^ inferior corporis metallico-nitentibus. 



Long. corp. 23--2S mm. : latit. 9--11 mm. 



Habit. Sarawak, Borneo septentrionalis. 



This species is closely allied to Cyclommaius monianellus 

 Molleiik. (iDsektenborse. xxi, 1904, p. 37'2) and differs from it 

 by the denticnlation of the inandii)]es; The colour of the pro- 

 thorax, of the head, of the mandibles, the underside, the legs 

 and of the scutelhim is a metallic copper-brown with crreenish 

 reflexes on the sides similar as in Boisd. (Voy. Astrolabe. 

 Col. 1832, p. 236, t. 6, fig. 20.) The elytra are yellowish with 

 a somewhat metallic line and the sutura and the sides narrowly 

 copper-brown margined ; this narrow dark margin becomes 

 2—3 mm. broad in the first third of the elytra near the shoulders. 

 This characteristic colouring of the sides may be easily over- 

 looked for it can only be seen by considering them. The 

 mandibles in the telodont form are longer than the protliorax 

 and the elytra together, and lightly curved inwards and 

 downwards, very finely punctured, black at the tip and here 

 shining. At the base they have a strong triangular tooth 

 directed inwards {montanellus has at the base a little bilobed 

 tooth followed bv a row of smaller teeth as in C. tarandus 

 Thunb.). Somewhat below the middle they are armed with a 

 thin tooth of 2—3 mm. in length, wh.ich arises on the underside 

 and is directed inwards and downwards. The -tip of the 

 mandibles has a row of 10—12 small teeth, the first of them 

 somewhat Inrger so that the tip is very similar to that of 

 C . ynefaVifpT, montonrllns and tarandus. The head is triangu- 

 larily flattened and not deeply excavated as in G. canaliculatus 

 Eits. at the front margin, which declines gradually to the 

 labrum. The latter is porrected, declivous and rounded at the 

 tip and bordered with golden hairs at the front margin. The 

 prothorax is twice waved at the sides, with a small tooth some- 

 what below the middle ; from the anterior edge to this tooth 



