262 Mr. W. F. Lancliester on some 



XX r. Genus Senex, Pfeflfer [ — PanaUrm, Gray). 



•SO. Senex ornafus, Fabr. 

 Paliuunis oniatiis, Fabr. Siippl. Ent. Syst. p. 400 (1798); Hasw. Cat. 



Austr. Crust, p. 171 (1882). 

 Sene.v oriiatiis, Ortmann, t. c. p. 34 (1892), ubi syn. 



Distr. East Africa, Ceylon, Malay Archipelago, N. Aus- 

 tralia, Hongkong, Japan, Samoa. 



No. XC. Hab. Pulau Satang. 



A male of this very variable species. On the antennal 

 segment are four forwardly-directed teeth arranged in a 

 square, the two anterior being larger ; between these lattei^, 

 but nearer to the left one than the right, is a small " Neben- 

 dorn." In a larger specimen in the iluseura collection, frpm 

 Natunas, there are two " Nebendornen " halfway between 

 each of the anterior and posterior teeth. The second and 

 third abdominal segments are marked with an interrupted 

 transverse hirsute furrow ; the specimen from Natunas is 

 without these, but has a deep furrow on the first abdominal 

 segment, without hairs, as in this specimen. 



Dim. : Base of eyes to posterior margin of carap. 37 millim. 



XXII. Genus Atya, Leach. 



31. Atya armata, A. M.-Edvv. 



Atya armata, A. M.-Edw. Ann. Soc. Entom. France, ser. 4, t. iv. p. 149 



(1864). 

 ? Atya molnccensis, de Haan, Crust. Jap, p. 186, pi. (1839). 

 Atya moluccensis, de iNIan, Weber's Zool. Ergebn. p. 357, pi. xxi. fig. 20 



(1892). 



Dintr. Malay Archipelago, Samoa, New Caledonia. 



No. LXX. Hdh. Simanggang. 



A male, which is certainly identical with A. armata. 

 Whether it is the same as de Haan's species, as Mr. Miens 

 seems to think (Ann. & Mag. N. H. (5) v. p. 382), is rather 

 more difficult to determine, for de Haan's description is too 

 brief. I have compared the mouth-parts of this specimen 

 with de Haan's figures [vide pi. O), but the latter are too 

 diagrammatic for an accurate comparison; as far as I can 

 determine, however, the two are essentially similar. 



Dim. : Length from orbital margin to tip of telson 

 50 millim. ; length from orbital margin to posterior margin 

 of carap. 15*5. 



XXIII. Genus Alpheus, Fabr. 



32, Al'pheus gradlipes'i^ Stimpson. 



Alpheus gracilipes, Stm. Proc. Ac. Nat. Sci. Philad. p. 100 (1860) ; 

 Sp. Bate, ' Challenger ' Macrura, p. 561, pi. ci. fig. 3 (1888) ; Ortmann, 

 op. cit. V. p. 488 (1891). 



