c 2 Dactyli of three posterior legs with a small, acute, accessory tooth 



on the posterior margin Polyxo de Man 



ó i Both in the male and in the female the dactylus of the small chela 

 subspatulate in form, "Balaeniceps"-shaped. 

 c\ Larger chela about 2,2-times as long as high, fingers almost as high 

 as the palm. 



i/ l Merus of y d legs 3,7-times longer than wide strenuus Dana 



d % Merus of y d legs almost 5-times as long as wide. strenuus Dana var. angulatus Cout. 

 (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 914). 



c„ Larger chela 2,4-times as long as high, fingers distinctly less high 



than the palm. Merus of y d legs 5-times as long as wide . . Audouini Cout. 

 (H. CoUTlKRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 914). 



c z Larger chela 2,86 — 3-times as long as high. Merus of 3 rd legs 5,26 — 



6, 5-times as long as wide. . . ... pareuchirus Cout. var. iiuitatrix de Man 



b„ Dactylus of smaller chela neither in the male nor in the female sub- 



6 J 



spatulate in form, never "Balaeniceps"-shaped. 

 (Tj Rostrum triangular, flattened above, very narrow. Proportion between 

 length and height of the small chela in the male 4,85 . 



bis-incisus de Haan var. stylirostris Cout. 

 (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 911, Fig. 49, 49*2). 



c„ Rostrum not flattened above. 

 d x Groove or depression on the supero-internal surface of the larger 

 chela not triangular. 

 e x Groove or depression on the supero-internal surface of the larger 

 chela U-shaped, the margins perpendicular to the upper margin 

 of the palm. Rostrum joining the frontal margin by a regular 

 curve Bouvieri A. M.-Edw. var. Hululensis Cout. 



(H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 908, PI. LXXXV, 

 fig. 46). 



<? 3 Groove or depression on the supero-internal surface of the larger 



chela almost inconspicuous. Frontal margin presenting a small 



prominence at either side of the rostrum Maindroni Cout. 



(H. CoutiÈke, in: Buil. Soc. Entom. France, 1898, N° 5, p. 133, Fig. 2). 



d 3 Groove or depression on the supero-internal surface of the larger 



chela triangular. 



e 1 Merus of both chelipeds with the infero-internal margin unarmed. 



Spine of basicerite as long as stylocerite. Carpocerite much 



longer than antennular peduncle. Lateral margins of the rostrum 



setose pacificus Dana 



e„ Merus of larger cheliped with a spine at the apex of infero- 



internal margin. 



!97 



