1914-] ^- H. GravKLY : An Account of the Oriental Passalidae. 327 



throw light on the position of that most aberrant of all Indo- Australian Passalids, 

 Tarqîiiniiis paradoxus, Kuwert, concerning which I have not hitherto dared to hazard 

 an opinion. 



Pseudepisphenus, n. gen. 



Lamellae of antennae six in number, all moderately long. Mandibles as in Tar- 

 quinius : symmetrical, the groove between the upper and middle terminal teeth very 

 sharply defined on the lower side, branched just above the external angle of the 

 mandible, the upper and more conspicuous branch extending obliquely across the 

 externo-dorsal surface to end in the upper tooth which is obtuse and set very far back ; 

 remaining teeth normal. Mentum as in Episphenm: primary scars absent; secondary 

 scars small and confined to anterior margin. Left outer tubercle of head composed of 

 two widely separated parts, of which only the outermost is represented on the right 

 side. Lateral and intermediate areas of meta sternum distinct. 



Pseudepisphenus perplexus, n. sp. 

 Text-fig. 8, A & B. 

 Described from a single specimen collected by Mr. A. F. R. Wollaston during the 

 Utakwa River Expedition in Dutch New Guinea, and preserved in the British 

 Museum. 



Text-figure 8. 



A. Pseudepisphenus perplexus, head x 4. 



B. Do. front of head from side x 8. 



C. Tarquiniiis paradoxus, head x 4. 



D. Do. front of head from side X 8. 



Length 24 5 mm. The lamellae of the antennae are moderately long and slender, 

 the last three much longer than the first three. The labrum is punctured and hairy, 

 its anterior margin is practically straight , its angles are rounded and the left one is 

 distinctly more prominent than the right. The general form of the mandibles has 

 been described in defining the genus ; it is unlike that found in any other Passalid 

 known to me except Tarquinius paradoxus, Kuwert ; the external angle is, how- 

 ever less pronounced than ir; that species, as is also the lateral keel behind it, 

 which is only indicated by a fine groove just above the outer margin ; the anterior 

 lower teeth, too, are somewhat shorter and stouter, and that on the left 

 mandible is no larger than that on the right. The mentum is extraordinarily like that 

 of Episphenus indiens, and in the single specimen before me I can find no characters 

 by which it can be distinguished. The head is highly polished, and entirely smooth 

 except for a few punctures in front of the parietal ridges. Its general form is shown in 



