192 



Memoirs of the Indian Museum. 



[Vol. Ill, 



Section I . 



Section II. 



Upper 

 hend. 



Plane of the lowest terminal tooth vertical, 

 the tooth itself not situated well behind the 

 two upper ones, directed forw.irds when 

 the mandibles arc open. 



Parietal and frontul ridges, and the inner and 

 outer tubercles with tho ridges associated 

 with them, all absent. 



Plane of the lowest terminal tooth 

 horizontal the tooth itself situa- 

 ted well behind the two upper 

 ones, directed inwards when the 

 mandil)les are open. 



Parietal and frontal ridges, and the 

 inner and outer tubercles with 

 the ridges associated with them, 

 present 



Middle part of prosteruuni flat or 

 with median groove or less dis- 

 tinct keel, the whole surface 

 between the coxae exposed, as 

 the coxae do not project suffi- 

 ciently from their cavities to meet 

 above it. Posterior plate of pros- 

 ternuni broadly truncate behind. 



Second and third | Tibiae each armed with a spine about two- Tibiae always unarmed except at 

 pairs of legs. thirds of the way down the outer side, the tip. 



except in a few species in which the pos- 

 terior tibiae are not so armed. 



Prothorax and its Middle part of prosteruuni with distinct median 

 ap]>cndagcs. keel which is usually hidden behind by the 



coxae, as the distal ends of these project 

 vertically from their cavities, their vertical 

 inner faces touching one another in almost 

 all species. Posterior plate of prosternuni 

 more or less pointed behind. 



.Mention of other, but less distinctive, differences between the two sections of 

 the family, which are referred to in the preceding part of this paper, need not be 

 repeated here. 



Three genera of the first section [Ceracupes, Auritulus and Cylindrocauliis) differ 

 markedly from all the rest; but although they are evidently related to one another 

 more closely than to any other genus, they differ from one another so greatly that no 

 single character not found in other genera of the section has yet been described as 

 common to all three of them. I have therefore included these genera with all the rest 

 in the s-ngle subfamily Aulacocychnae, although I think that a further examination 

 of them may yet afford grounds for their separation. My principal reason for 

 thinking this is that all known species of Ceracupes and Auritulus differ from all 

 species I have examined of the genera Tristorthus, Taeniocerus, Comacnpes and 

 Aulacocyclus , in having the middle lower tooth jointed on to the basal part of the 

 mandible, as it appears to be in all genera of the second section of the family, 

 instead of fused with it. Unfortunately I have not seen any specimens of the genera 

 C'lii/tfer and Cylindrocaulus. 



The genera of the single subfamily Aulacocyclinae, of the first section of the 

 family, may be distinguished from one another thus: — 



''Central tubercle not produced forwards to fuse with anterior margin 



of head ; upper tooth of mandibles not unusually long . . 2. 



Central tubercle very strongl>- developed, its apex fused with 

 anterior margin of head ; upper tooth of both mandibles very long 

 and slender; middle lower tooth moveable .. .. .. rcn/c;/ /'is, Kanp; pp. 2ij 



& -77 ■ 



