3i8 



/g At either side of the minute rostrum the frontal margin 

 runs transversely outward, the front appearing truncate. 

 Dactylus of smaller chela in the male broadened, half as 

 broad as long, a little shorter than the palm. Merus 

 of 3'''^ legs almost 4-times as long as wide in the middle, 

 carpus without spinules on the posterior margin 



pachychirus Stimps. (young specimens) 



d,^ Fingers of smaller chela in the male not shorter than the palm. 



e^ Dactylus of smaller chela in the male enlarged, half as broad 



as long. First carpal article of 2°"^ legs one and a half to 



almost twice as long as 2°*^. At either side of the minute 



rostrum the frontal margin appears truncate 



pachycJiirus Stimps. (adult specimens) 

 e„ Fingers of smaller chela in the male just as long as the palm, 

 gaping, their infero-external border excavate and fringed 

 with short setae. Dactylus tapering, not broadened. First 

 carpal article but a little longer than 2"*^. Merus of 3''<i 

 legs 5- or almost 5 -times as long as wide in the middle, 

 /"j Merus of 4* legs armed with an apical tooth like that 



of 3""'^ Stanleyi Cout. 



(H. COUTIERE, in: Bull. Soc. Philom. Paris, 1908, p. 17). 



_/"„ Merus of 4"^ legs quite unarmed at apex, 5,2 — 5,6-times 



as long as wide in the middle .... StanleyiQ,ow1.VA.x . dearmatus di&yV'a.w 



a„ Merus of ^''^ legs unarmed at apex. 



6^ Rostrum well developed, reaching to the middle of basal antennular 



article, continued backward as a short and strong carina . . . ovaliceps Cout. 



(H. COUTIERE: Alpheidae Maid, and Laccad. Archip. 1905, p. 888, PI. LXXVII, 

 fig. 27). 



b^ Rostrum wanting at all, front truncate frontalis H. M.-Edw. 



Insignis subgroup. 



«j Merus of 3''' legs with an acute tooth at apex. 



b^ Larger chela with a transverse groove near the articulation of the 



dactylus. 



c^ On either side of the rostral carina, at the base of the eye-hoods, 



a pointed tooth, flattened at its base; interorbital part of the 



rostral carina strongly compressed, acute, with a small, obtuse 



tubercle at the level of these lateral teeth. 



d^ Rostral carina, behind the median tubercle, gradually fading away, 



not bounded on either side by a shallow groove or depression, bidens (Oliv.; 



1 86 



