352 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



in their natural positions, and in their true relative proportions. In Adams's i)late the fourth 

 joint of the fourth thoracic leg has lG-17 rings, the liftli joint 8 rings. In the Nassau forui'the 

 carpus has 10-12, the propodus 5-7 rings. In details like this, where the right and left sides of 

 the same individual are often unlike, it would be surprising to find agreement. Von Martens's 

 short notice of the Cuban occurrence does not give us much additional knowledge, but there is uo 

 doubt that the alcoholic specimens examined by him belong to the same species as that described 

 in this paper. He says : " Ich weiss keinen erheblichen TJnterschied zwischen diesen cubauisehen 

 Exemplaren und den indischeu anzugebeu, welch letztere ich bei Amboiua gesammelt habe. * 

 * f Nur erscheinen die indischeu im Leben bunt roth gezeichnet, in Spiritus blass orange und 

 melir hartschaiig, endlich scheint Carpus un<l Hand des dritteu Fusspaars bei ihnen minder vier- 

 seiiig, doch ist dieser letztere Unterschied gering und fliesseud." He then add§ that he would 

 not be Burpiitied if it should turn out that the West Indian form was specifically difterent from the 

 East Indian. 



So far then as we can judge from the figures and meager descriptions in our possession, the 

 Asiatic Stenopus hispidus cau not be regarded as specifically distinct from the American form. 

 Perhaps a point of diflereuce worthy of remark is the length of the body from rostrum to end of 

 telson, which is given as 2^ and 3 inches by Adams and Daua respectively. None of the Nassau 

 specimens which I have measured were more than IJ inches long. The data upon this point are not 

 conclusive, and, in view of our knowledge of local variations iu this respect, cau not be regarded 

 as of much importance. It is hoped that the descriptions and measurements which are here given 

 will aftbrd a basis for future comparisons with the Pacific Stenopus hisjiidus. 



List of species. 



So far as I can learn, only five species of the genus Stenopus (Latreille) have been described, viz: 



(1 ) stenopus hispidus {Lair.) : 



Distribution : (n) ludian Ocean, Borneo, and Philippines (Adams). 



(6) Paumotu Islands and Balabac Passage, north of Borneo (Dana). 



(c) Amboyna, Cub^ (Von Martens). 



(d) Abaco and New Providence, Bahama Islands. 



(c) " Red Sea, ludian Ocean, ludian Archipelago, New Guinea " (de Man). 



(2) Stenopus spinosus (Risso) : 



Mediterranean (Heller), teste Von Martens and de Man. 



(3) Stenopus enmferus (Dana): 



Fiji Islands. 



(4) Stenopus semilwins ( Von Martens) : 



(Oue specimen in the Berlin Zoological Museum, purporting to have come from the West Indies. Length IS""". 

 Von Martens.) 



(5) Stenopus tenuirostris (de Man) : 



Amboyna: Length 24"™. (More closely allied to Stenopus spinosus of the Mediteranean than to Stenopus 

 hispidus, and is the representative of the former in the Indian Ocean ; de Man.) 



STENOP08 LITERATURE. 



(1) Olivier: Encyclop^die M^thodique, Hist. Nat. Insectes, t. viii, p. 666, 1811. 



(2) Latreille : Encyclop^die M^thodique, Hist. Nat. Crustaces, Arachnidses, et Insectes, t. 10, Paris, 1882. 



(3) Milne Edwards, H. : Hist. Nat. des Crustaces, t. 2, p. 40(5, 1837. 



(4) Milne Edwards, H. : Le Rfegne Animal, Cuvier ; Les Crustaces, with Atlas, by Milne Edwards, p. 137. 



(5) Adams and White: The Zoology of the Voyage of H. M. S. Samarang, 1843-6, p. 61, Loudon, 1850. 



(6) Dana, J. D. : U. S. Exploring Exped. U. S. N., 1838-1842, vol. xiii, pt. 1, Crustacea, p. 607. 



(7) Martens, E. V. : Ueber Cubanische Crustaceeu ; nach den Sammlungen Dr. J. Gundlach. Archiv. f. Naturgesch., 

 38. Jahrg., Bd. 2, 1872, p. 143. 



(8) Belter: Crustaceen des siidlichon Europa, S. 299. (1 have seen only references to this paper.) 



(9) De Man, J. O.: Bericht iiber dieim indischeu Archipel von Dr. J. Brock gesammelten Decapodeu und Stomato- 

 poden. Separat-Ausgabe .ins dem Archiv. f. Naturgesch., 53. Jahrg., pp. 215-600, 17. Taf., Berlin, 1888. 



