rgi4.J F- H. Gravely : An Account of the Oriental Passalidae. 235 



Aceraius kuwerti, Zaïig. 

 PI. xii, fig. 31. 



The Berlin collections include a number of specimens from Mt. Kina Balu, 

 c. 5000 ft. 



Description. — Length 43-49 mm. This species resembles large specimens of 

 A. grandis sub-sp. hirsutus in all characters except the following: upper tooth of left 

 mandible somewhat more prominent, always bidentate in unworn specimens ; anterior 

 angles of head not prominent, symmetrical; apical angles of supra-orbital ridges 

 inclined to be more prominent ; right outer tubercle usually more or less obsolete ; 

 ridge separating lateral and intermediate areas always sharp, smooth and polished; 

 posterior parts of hind coxae apt to be less extensively punctured than is usual in 

 A. grandis , sova.Qtm\.QS finely rugulose or entirely smooth ; anterior part of tenth rib 

 of elytra hairless and unpunctured. 



Aceraius tricornis, Zang. 

 Text-fig. 4B, p. 234. 



There are examples of this species both in the British Museum and in the 

 Deutches Entomologisches Museum ; all of them are from Mt. Kina Balu (c. 5000 ft.) 



Description. — Length 49-53 mm. Differs from the preceding species in the fol- 

 lowing characters only : right outer tubercle of head absent ; inner tubercles minute, 

 that of left side situated on inner margin of left outer tubercle, that of right side 

 situated further back ; apical angle of supra-orbital ridge still more prominent , and 

 situated further forwards along inner wall of anterior truncation, where it forms 

 a conspicuous tubercle directed upwards and a little inwards. 



Aceraius laevimargo, Zang. 



Described from specimens from Mt. Kina Balu, c. 5000 ft. in the collections of 

 the British Museum and Deutsches Entomologisches Museum , and two from Sumatra 

 in the latter collection. 



Description. — Lengtii 34-39 mm. Differs from A. laniger and .4. kuwerti <Ai\e?iy 

 in its smaller size and much greater variability.' Lamellae of antennae remarkably 

 variable, the whole range of variation found in the genus being found in this -single 

 species; right outer tubercle of head quite as well developed as in ^. laniger, simply 

 pointed in profile.'^ Metasternum and e/y^îra variable, resembling those of ^ . /flmggr 

 or A. kuwerti, or intermediate between the two; the seventh rib of the elytra some- 

 times almost unpunctured. In all other characters this species resembles the two 

 preceding. The scars on the meso sternum are almost always distinct. 



Aceraius pilifer (Percheron). 

 PI. xii, fig 35. 

 The specimens I have seen include insects from Sumatra in the British Museum 

 collection; from Tjibodas, c. 5000 ft., and Preanger, 4-6000 ft. in Java, in the 



' The apex of the left upper tooth is probably always bifi'd in fresh specimens. 



'^ But for size and this characteristic the species might easily be confused with .4. perakensis. 



