I9I4-] 



F. H. GRAVEI.Y : An Account of the Oriental Passalidae. 



Upper margin of left mandible, between upper tooth and base, 

 straight or lightly curved so as to contain not less than j20° ; ridge 

 joining inner tubercles usually straight and not strongly crested ; 

 pronotum usually very strongly punctured in anterior angles ; 

 posterior angles of lower side of prothorax usually not very hairy. . [Cetejus, Kaup]. 

 Upper margin of left mandible, between upper tooth and base, 

 abruptly bent making a distinct angle of at most 120°; ridge join- 

 ing inner tubercles usually concave and sharply crested, the crest 

 projecting forwards ; anterior angles of pronotum almost or quite 

 unpunctured; posterior angles of lower side of prothorax usually 

 very hairy .. .. .. .. ., [Analaches, Kuwert]. 



^lycft outer tubercle broader, but little longer than right; when a 

 ridge is present between left inner tubercle and supra-orbital ridge, 

 it is directed towards anterior end of latter . . . . [Pelopides, Kuwert]. 



Left outer tubercle much longer than right ; a ridge extending be- 

 hind deep excavation from left inner tubercle towards middle of 

 supra-orbital ridge . , 



[Protomocoelns , Zang ( = 

 Pelops, Kaup)]. 



9'{ 



''Lamellae of antennae usually all rather short and stout, never more 

 than four very long and slender; mandibles normal or with denti- 

 tion reduced on right side ; secondary scars almost always longitu- 

 dinally Hnear and widely separated 



All six lamellae of antennae long and rather slender ; mandibles 

 sometimes normal, more often with anterior lower tooth absent or 

 fused at base with lowest terminal tooth, especially on left side ; 

 secondary scars semi-circular or V'Siiaped, more or less transverse, 

 often more or less distinctly continuous with one another across 

 middle line 



Lateral and intermediate areas of metasternum fused ; mandibles 

 normal on both sides . . 



(Gonatas Group) 17. 



{Hyperplesthenns Group) 



'\ Lateral and intermediate areas of metasternum distinct ; anterior 

 lower tooth of right mandible smaller than that of left, usually 

 I absent 



and the dentition is clearly complete and normal, though the anterior lower and lowest terminal teeth 

 are broken on the right side in the type. 



' See Heller, 1910, p. 14. These two genera cannot be sharply separated from one another, and 

 should perhaps be regarded as sub-genera only. 



* Kuwert separates these two genera thus, but his figure scarcely bears out his statement that the 

 left outer tubercle is much longer than the right in Protomocoelus ; and the material before me seems to 

 indicate that his figure is better than his description. I am inclined to think that Pelopides will ulti- 

 mately have to fall as a synonym either of Analachis or of Protomocoelus ; but which cannot be deter- 

 mined before the mandibles and metasternum are described after examination and not, as in the above 

 key, by inference. So I prefer to retain the name for the present. Zang (1905&, p. 227) who had also 

 not seen a specimen (19051?, p. 316) regards P. schraderi, Kuwert, from New Guinea, as the type of the 

 genus, which he considers distinct ; and suggests that the remaining species, P. gravidus, Kuwert, from 

 Mindanao, ought probably to be transferred to some genus of the Gnaphalocnemis group on account of 

 its toothed labrum. 



