570 



Transactions. 



In the size, form of the body, character of the dorsal surface and of the 

 appendages this species is close to T. commensaUs Chilton, which is com- 

 monly found in ants' nests in New Zealand. That species differs, how- 

 ever, in colour and in the greater compactness of the body and in the shorter 

 antennae and uropods, and it has the tubercles on the dorsal surface much 

 better marked. 



Philoscia oliveri sp. nov. Fig. 4. 



Elongate-oval, widest at fourth and fifth peraeon segments, narrowing 

 slightly anteriorly and posteriorly, dorsal surface with small sparsely 

 scattered hairs. First two segments of peraeon with margin very slightly 

 sinuous, first segment slightly longer than the others, postero-lateral angles 

 of segments 5, 6, and 7 somewhat produced but not acutely, those of seventh 



segment reaching to the middle of the lateral 

 margin of the second pleon segment. Pleon 

 abruptly narrowed ; first two segments a 

 little shorter than the others ; third, fourth, 

 and fifth with very small adpressed epimera ; 

 last segment broader than long, sides slightly 

 sinuous ; extremity broadly rounded and 

 bearing a few setules. 



Antennae about half as long as the body, 

 hirsute, second and third joints subequal, 

 the fourth shorter than the fifth, and sub- 

 equal with flagellum, the 3 joints of which 

 are of about equal lengths. Uropods with 

 the base extending beyond the telson, nar- 

 rowed proximally, its outer side grooved 

 and inner margin with a dense fringe of 

 very short setae, inner ramus arising a little 

 anterior to the outer and about half as long, 

 both slender and hirsute ; total length of 

 uropod nearly equal to that of pleon. 



Length, 5 mm. ; greatest breadth, 2 mm. 



Colour. — Light brown, with marblings of 



darker brown sometimes forming indistinct 



longitudinal bands, one central and two lateral. Mr. Oliver notes that the 



species is " very variable in colour." 



Hab. — Expedition Hill and Mount Junction, Sunday Island ; several 

 specimens from each locality. 



This species appears to belong to the same section of the genus as 

 P. puhescens Dana from New Zealand, P. mina Budde-Lund and P. hirsuta 

 Budde-Lund, both from the Cape of Good Hope. I have specimens, not 

 yet described, from Norfolk Island which are a little broader and a little 

 darlcer in colour, but M'hicli appear to be only a variety of the present species. 

 P. lifuensis Stebbing, from the Loyalty Islands, presents some resemblances, 

 but differs in the outline of the iDody and in the much shorter pleon and 

 uropods. 



I have named this to indicate my indebtedness to Mr. W. Reginald B. 

 Oliver for the opportunity of examining the fine collection of Crustacea be 

 made at the Kermadec Islands in 1908. 



Fig. 4. — Philoscia oliveri 

 and uroi^od. 



Pie 



