240 Memoirs of the Indian Museum. [Vol. Ill, 



Aceraius minor, n. sp. 



Text-fig. 4D, p. 234. 



Described from five specimens from Taiping, 4000-5000 ft., in the Kgl, Zool. 

 Museum in Berlin. 



Description. — 23-25"5 mm. Resembles A. horneanus except in the following 

 respects. Upper tooth of mandibles obsolete, the upper margin practically straight; 

 lowest terminal tooth of left mandible well developed^ equal to that of right ; ante- 

 rior lower tooth of left mandible also well developed, but much smaller than that of 

 right which, as is usual in this genus, is very large. Left outer tubercle of head shorter 

 and somewhat stouter, inner angle of distal truncation scarcely developed, the 

 tubercle as a whole consequently directed more forwards ; right outer tubercle some- 

 what variable in both species, but as a rule rather better developed in this one 

 than in the preceding. Abdominal sterna somewhat more distinctly punctured in the 

 scars ; elytra with hair-bearing punctures on the seventh and ninth ribs only, the 

 whole of the eighth and tenth smooth and hairless. 



Aceraius aequidens, n. sp. 

 Text-fig. 4E, p. 234. 



Described from one specimen from Kina Balu in the collection of the Deutsches 

 Entomologisches Museum. 



Description. — Length 29 mm. Differs from the preceding in the following charac- 

 ters only: anterior lower tooth of left mandible not very large, scarcely larger than 

 that of right mandible ; mentum somewhat as in ^ . wallacei, anterior margin depressed 

 on either side of the middle line only, in the single specimen that I have seen ; inner 

 angle of distal truncation of left outer tubercle of head better developed ; right outer 

 tubercle more as in yl . borneanus ; abdominal sterna also as in that species ; seventh 

 to tenth ribs (inclusive) of elytra with hair-bearing punctures, but with scarcely as 

 many as in A . borneanus. 



Subfamily MACROLININAE. 



Genus MACROLINUS, Kaup. 



The form of the frontal area of the head, the lengths of the lamellae of the 

 antennae and the presence or absence of densely punctured areas on the pronotum, all 

 of them characters which have been found apt to be of Httle value, and often actually 

 misleading, for taxonomic purposes in other genera, have usually proved to be 

 constant throughout each of our extensive series of specimens of difïerent species 

 of this genus, and to provide the best means of distinguishing one species from 

 another. 



