425 



the lamented Dr. Nobili has described, p. 357, a new species, A, hoplites Nob., pertaining 

 to the Edwardsii group, but in which the dactyli of the 3 1 ' 1 and 4 th legs are armed with 

 an accessory claw. It appears therefore quite probable that also A. Polyxo once will 

 prove to belong to this group, especially because its other features are those characteristic of 

 this section. 



62. AlpJiais strauius Dana. 



Alpkeus strenuus J. D. Dana, U. S. Explor. Exped. Crustacea, 1852, p. 543, PI. 34, fig. 4. 

 Alpkeus strenuus H. Coutière, in: Notes from the Leyden Museum, XIX, 1897, p. 199 and 



in: Alpheidae Mald. and Laccad. Archip. 1905, p. 913, PI. LXXXVII, fig. 53. 

 Alpkeus lobidens YV. F. Lanchester, in: Proc. Zool. Soc. London, 1901, p. 563. 



Stat. 60. April 27/28. Haingsisi, Samau-island near Timor. Reef. 1 egg-bearing female and 



1 very young specimen. 

 Stat. 93. June 24/25. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu-archipelago. Reef. 1 very 



large specimen without eggs, 2 egg-bearing females and 2 young specimens. 

 Stat. 181. September 511. Ambon-anchorage. 36 — 54 m. Mud, sand and coral. 4 specimens, 



1 of which with eggs. 

 Stat. 213. September 26 — October 26. Pulu Pasi Tanette. Reef. 1 egg-bearing female. 

 Stat. 225". November S. South-Lucipara-island. Reef. 1 male. 

 Stat. 25S. December 12/16. Tual-anchorage, Kei-islands. 22111. Lithothamnion; sand and coral. 



1 ova-bearing female. 



The Iargest specimen is one from Stat. 93 without eggs, that is 61 mm. long, but, 

 according to Professor Coutière (1. c. 1905), A. strenuus attains a length of 95111111.; the 

 Iargest ova-bearing female, that from Stat. 258, is 51 mm. long, but another, from Stat. 93, 

 measures only 39 mm. 



According to Coutière, the merus of third legs should be 3,7-times as long as broad; 

 in the female, long 51 mm., from Stat. 258 the proportion is 4, the merus being 8 mm. long 

 and 2 mm. broad. The other specimens fully agree with it. 



Remarks. The most closely related form is A. crassimanus Heller. Both species, 

 indeed, resemble one another very much with regard to the rostrum, the telson, the antennal 

 and antennular peduncles, the lobes on the upper and on the lower border of the palm which 

 in both species are obtuse, but A. strenuus difiers by the small chela being £a/aenicefts-sha.ped 

 both in the male and in the female, by the palm of the large chela being less high in 

 proportion to the length and by the fingers being slightly higher with regard to the height 

 of the palm ; the notches and the grooves on the palm of the small chela are moreover less 

 conspicuous than in A. crassimanus. The examination of two specimens of the species referred 

 by Air. Lanchester (1. c.) to A. lobidens de Haan, which specimens, collected at Pulau Bidan, 

 Penang, I was enabled to examine by the kindness of the Direction of the Museum at Cambridge, 

 proved them to belong to A. strenuus Dana. 



General distribution: Tongatabu (Dana); Rotuma (Borradaile) ; Funafuti (Borra- 

 daile); Banda-Neira (Coutière)-, Aru Islands (Coutière); Gorontalo (Coutière); Pulau Bidan, 

 Penang and Kelantan (Lanchester); Maldive and Laccadive Archipelagoes (Coutière); Djibouti 

 (Coutière). 



293 



