252 The Philippine Journal of Science leis 



Parorchestia tenuis (Dana) was found in New Zealand "among 

 roots of grass and in small stream." Parorchestia hawaiensis 

 (Dana) is from the Hawaiian Islands. Parorchestia sylvicola 

 (Dana), also from New Zealand, was found in "moist soil in 

 the bottom of the extinct volcano of Taiamai, far from the sea." 

 Curiously enough our mountain form comes from the bottom of 

 an extinct crater, and both of our forms are most nearly related 

 to P. sylvicola. 



Other talitrids have been reported from tropical forests, usu- 

 ally from high altitudes. Chiltonia mihiwaka (Chilton) comes 

 from high mountain streams in New Zealand, but Chiltonia has 

 antennae I and II of equal length and uropod III 1- jointed. Or- 

 chestia rectimana (Dana) is from high altitudes in Tahiti; 0. 

 montana Weber, from high altitudes in Celebes ; 0. parvispinosa 

 Weber from high altitudes in Java ; 0. humicola Marts, is a ter- 

 restrial species from Japan; and 0. bottae M. E. has been found 

 in Holland, remote from the sea. Likewise Talitrus furnishes 

 several terrestrial species, as, T. sylvaticus Hasw. from New 

 South Wales and Tasmania, T. allaudi Chevr. from Seychelles, 

 and T. gulliveri Miers from Rodriguez Island. But Orchestia 

 and Talitrus are both characterized by a wanting or rudimentary 

 fourth joint of palp of maxilliped. It seems, from the specific 

 descriptions, as if a number of the terrestrial talitrids, especially 

 those from high altitudes, should be reexamined as to their 

 generic relationships to Parorchestia^ 



Following Stebbing, in the "Amphipoda Gammaridea" of Das 

 Tierreich, the species, including our two new Luzon forms, may 

 be arranged as follows : 



Genus PARORCHESTIA Stebbing 



Synopsis of species. 



o'. Antennae I with third joint of peduncle shorter than second, flagellum 

 5- to 6-jointed; uropod I, outer ramus without marginal spines; telson 



apically with groups of spinules P. tenuis (Dana). 



a'. Antennae I with third joint longer than second; telson apically without^ 

 groups of spinules. 

 6\ Antennae I with joints (7-jointed) of flagellum unusually elongate, 

 third joint of peduncle longer than first and second together; uropod 



I, outer ramus without marginal spines P. hawaiensis (Dana). 



b'. Antennae I with joints of flagellum not very elongate, third joint of 

 peduncle shorter than first and second together. 



' In this connection the student should carefully examine a paper on 

 similar amphipoda recently published in Indian Museum Notes. 



' Certainly without groups of spinules in P. luzonensis and P. lagunse, 

 and not mentioned for P. hawaiensis or P. sylvicola. 



