Dr. G. A. K. Marshall on Alcides, Schonh. 153 



As a matter of fact, A. delta differs from both the other 

 forms mentioned above in a very striking character ; nor- 

 mally in Alcides each tarsal claw is deeply cleft, but in 

 A. delta the claws are simple and soldered together at the 

 base. This character is also found in yet another new and 

 allied species, likewise from Ceylon. I have not so far 

 observed it elsewhere in the genus, though Lacordaire men- 

 tions its occurrence without citing any species. A. triangu- 

 lifer presents a somewhat intermediate condition, the inner 

 division of the claw being very much reduced. 



The following table will serve to discriminate the mem- 

 bers of this group, all of which possess a similarly-shaped 

 large patch of silvery-white scales on the side of the meso- 

 aud metasternum, and this also occurs in the very differently 

 marked A. kirschi, Pasc, from Labuan : — 



1(4). Tarsal claws simple, connate at the base ; 



sides of prothorax not constricted in 



front; genas of J not produced down- 

 wards at the apex. 

 2(3). Transverse impression at base of elytra 



shallow, base of prothorax not lower 



than the apex ; apical edge of rostrum 



produced into a short point in the 



middle : delta, Fasc. 



3(2). Transverse impression on elytra very 



deep, base of prothorax distinctly lower 



than the apex ; apical edge of rostrum 



shallowly emarginate in the middle. .. ephippiatus, sp. n. 



4 ( 1). Tarsal claws cleft ; sides of prothorax 



markedly constricted in front ; gense 

 of d with a tnsk-like downward pro- 

 cess at the apex. 



5 (14). Elytra with a large common triangle 



formed of broad pale stripes enclosing 

 a black triangle ; front tibias with an 

 internal tooth placed nearly in the 

 middle. 



6 ( 9). Peduncle of submentum narrowly ob- 



long (2 X 1) and shallowly constricted 

 at the extreme base only ; anterior 

 pale stripe on prothorax running trans- 

 versely upwards along the edge of the 

 granulate area, not covering the post- 

 ocular lobe. 



7(8). Apical margin of rostrum rounded; 

 scutellum pointed at apex; post-hume- 

 ral stripe on elytra not uniting behind 

 with posterior angle of the pale tri- 

 angle ceratnodelta, sp. n. 



8 ( 7). Apical margin of rostrum with a short 

 sharp point in the middle ; scutellum 



