TERRESTRIAL ISOPODA OF NEW ZEALAND. 117 



enclopotlite is larger in comparison -witli the exopodite. In the second pleopod tlio 

 endopodite is narrow and projects consideral^ly l)eYond the exopodite. In l)oth pairs 

 there is a lateral expansion of the protopodite corresponding to tlie "epipodite" 

 described in Ligid iiovte-zeulandicB. The remaining pleopcjda are of th<! usual form. 



In the male the first two pairs of pleopoda are specially niodiflcd, as in other spcci(!S, 

 for sexual purposes, but they differ considerably in detail. Tlu! first pleopod, together 

 with the sexual appendage, is shown in figure pip} cf . The sexual appendage is soft 

 and membranous, spatulate in form ; the endopodit(> is narrow, subtriangular, and ends 

 in a very long, narrow, chitinous, styliform process whicli tajjcrs gradually to the very 

 acute apex. In the second pleopod (fig. ^j//;.-) the endopodite is modified into a 3-jointed 

 penial appendage, strong and higidy chitinised; it is of nearly the same breadth 

 throughout except at the extremity, where it narrows abruptly and ends acutely. 



2. Trichoniscus otakensis, sp. nov. (PI. 12. fig. 2.) 



Philoitgria rosea, Cfiifton, Trans. N. Z. lust. xv. |). 14i), unci p. 7?, (in part) (18<S;3). 

 Philijyr'iu rosea, Thomson & Cliifton, Trans. N. Z. Inst, xviii. p. 157 (in part) (1886). 

 Philougria rosea, Filliol, Mission de file Campbell, p. 439 (in part) (188r>). 



Specific description. — Male and female differing in the shape of the body. 



Female. — Body oblong oval, 2\ times as long as broad; whole dorsal surface thickly 

 covered with irregular, densely crowded, roughish tubercles. Cephalon Avith the lateral 

 lobes fairly large ; margins with two or three setae, but hardly denticulate ; front slightly 

 convex. Segments of mesosonie slightly separated laterally ; first four segments with 

 the lateral angles rounded, the last three with the postero-lateral angles recurved and 

 acuminate. Metasome rather less than one-fourth the length of the body ; last segment. 

 with its posterior margin straight and bearing three or four small setse. 



Antennae rather stout ; fourth joint of j^eduucle stout; fifth joint narrowed at base 

 and expanding slightly distally, its inner margin with four or five distinct prominences, 

 from wiiicli short stout setae may arise ; outer margin straight, fringed with fine setae ; 

 flagellum nearly as long as the last joint of peduncle, composed of four joints. Uropoda 

 rather short, stouter than in T. phormiamts ; outer ramus twice as long as the base. 



Male. — Much narrower than the female, the greatest breadth less than one-third the 

 length ; none of the legs specially modified. 



Colour light brown, with markings of darker brown. 



Length about 4 mm. 



Habitat. — Widely distributed throughout the South Island, N. Z., in damp situations. 



Memarks. — This species closely resembles the preceding one in most respects, but can 

 be readily distinguished from it by the tuberculatcd surface, the stouter antennae and 

 uropoda, and, in the male, by the narrow form of the body. 



The mouth-parts, legs, and pleopoda (including those specially modified in the male) 

 closely resemble those of T. phormianus and do not call for special description. 



I have a few specimens from Greymouth, collected by Mr. R. Helms, that I refer to 

 this species with some hesitation. The specimens, which appear to be all females, are 

 of sHghtly larger size, and have the body broader and more compact than in the typical 



18* 



