192 



Memoirs of the Indian Museum. 



[Vol. Ill, 



Plane of the lowest terminal tooth vertical, 

 the tooth itself not situated well behind the 

 two upper ones, directed forwards when 

 the mandibles are open. 



Upper surface of 

 head. 



Parietal and frontal ridges, and the inner and 

 outer tubercles with the ridges associated 

 with them, all absent. 



Prothorax and its 

 appendages. 



Second and third 

 pairs of legs. 



Middle part of prosternum with distinct median ! 

 keel which is usually hidden behind by the i 

 coxae, as the distal ends of these project 

 vertically from their cavities, their vertical 

 inner faces touching one another in almost j 

 all species. Posterior plate of prosterimm | 

 more or less pointed behind. 



Tibiae each armed with a spine about two- 

 thirds of the way down the outer side, 

 except in a few species in which the pos- 

 terior tibiae are not so armed. 



Plane of the lowest terminal tooth 

 horizontal the tooth itself situa- 

 ted well behind the two upper 

 ones, directed inwards when the 

 mandibles are open. 



Parietal and frontal ridges, and the 

 inner and outer tubercles with 

 the ridges associated with them, 

 present. 



Middle part of prosternuni 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. 



Tibiae always unarmed except at 

 the tip. 



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 Cylindrocaulus) 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 single 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 T have examined of the genera Tristorthus, Taeniocerus, Comacupes 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 

 Caidifer and Cylindrocaulus. 



The genera of the single subfamily Aulacocychnae, 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 strongly developed, its apex fused with 

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

 and slender; middle lower tooth moveable .. .. .. 6>rac#/)es, Kaup; pp. 212 



■ . & 277. 



