136 Dr. W. T. Caiman on a Terrestrial 



dorsal outline of the head is shorter than that of the first free 

 somite; the anterior lobe of the fifth coxal plate is more 

 rounded below ; the basis of the last pair of legs has a 

 different outline, with the hinder margin less convex and 

 more strongly serrated ; the outer plate of the maxillipeds is 

 bluntly pointed and the terminal segment of the palp is 

 larger and sharply defined ; the merus of the second gnatho- 

 pods has a prominent lobe on the under side, and the carpus 

 is, at all events, much less slender than in the species here 

 described. 



The genus Talitroides was proposed by Bonnier (in 

 Willem, Ann. Soc. ent. Belgique, xlii. 1898, p. 208) for an 

 unnamed species found in a conservatory at Ghent. To this 

 species Stebbing afterwards gave the name T. bonnieri 



Fig. 1. 



TaUirvs horfulanvs, sp. n. Adult male, X 10. 



(' Tierreich,' Gammaridea, 1906, p. 527). It has not, I 

 think, been pointed out that Bonniei's description contains 

 nothing inconsistent with the supposition that he had before 

 him specimens of Talitrus alluaudi. 



So far as I know, the only other species of terrestrial 

 Amphipod recorded as found living under artificial conditions 

 in Europe is Orchestia senni, recently described by Menzel 

 (Rev. Suisse Zool. xix. 1911, p. 438, figs. 4-9) from the 

 botanic garden at Basel. As only the female is described, 

 the species may possibly be referable to Talitrus, and may 

 even not differ very greatly from T. alluaudi -, it is certainly 

 distinct from the species described here. 



