"20 Memoirs of the Indian Museum. [Vol. VII, 



A. teres is much larger than A. edentulus ; its central tubercle is even more elevated, 

 and is somewhat more abruptly bent forwards — scarcely as abruptly, however, as in A. 

 collaris. The elytral grooves are very shallow and are obscurely punctured at the sides only. 



The above-mentioned species of Aulacocyclus may be separated thus : — 



The antennal lamellae long and slender ; Papuan and Moluccan 



species ., .. .. . . .. .. .. 2. 



The antennal lamellae shorter, at most moderately long and 



slender ; Australian and New Caledonian species (1 also from 



Woodlark island) . . . . . . . . . . . . 6. 



The central tubercle grooved above, its apex more or less 



overhanging . . . . . . . . . . . . . . 3. 



The central tubercle not grooved above, its apex erect, laterally 



compressed and simply pointed . . . . . . A. felderi, p. 18. 



The grooves of the elytra shallow and scarcely punctured . . A. glabriusculus, p. 17. 

 The grooves of the elytra deeper and more or less strongly 



punctured . . . . . . . . . . • • • • . *• 



Ç The central tubercle depressed, with slender overhanging apex A. perlalus, p. 17. 

 1 < The central tubercle less depressed, with stouter or scarcely 



V overhanging apex . . . . . . . . . . • • 5- 



( The apex of the central tubercle well developed, usually more 



or less hook-like .. .. .. .. A. parryi; p. 17. 



The apex of the central tubercle short and stout, scarcely 

 overhanging . . . . . . . . ..A. aruensis. p. 18. 



The central tubercle very short, its apex scarcely or not over- 

 n j hanging . . . . . . . . • • • • • • ' • 



The central tubercle more strongly elevated, with overhanging 



apex . . . . . . . • • • • • • • "• 



[ The central tubercle laterally compressed ; the anterior part of 

 7 J the head not conspicuously punctured . . . . A. mastersi, p. 18. 



i The central tubercle very broad ; the anterior part of the head 



[ somewhat strongly punctured . . . . . . A. deyrollei, p. 19. 



( The central tubercle pointed at apex as seen from above, with 

 8-] a pair of small tubercles beside the mid-dorsal groove behind A. tricuspis, p. 19. 

 (_ The central tubercle normal, bifid at apex as seen from above . . . . 9. 



r The central tubercle moderately elevated and somewhat abruptly 



1 bent forwards ; the elytral grooves very coarsely punctured . . A. errans, p. 19. 



) The central tubercle more strongly elevated and less abruptly 



bent forwards ; the elytral grooves not very strongly punctured . . . . 10. 



The central tubercle gradua 1 ly curved forwards ; the elytral 

 \ grooves strongly impressed and distinctly punctured . . A. edentulus, p. 19. 



j The central tubercle somewhat abruptly bent forwards ; the 

 {_ elytral grooves shallow and indistinctly punctured .. A. leres, p. 19 



