TERRESTRIAL ISOPODA OF NEW ZEALAND. 139 



The folio-wins: are the ijeneric characters as mven bv Sars : — 



" Body oval, more or less depressed, with the latei-al parts lamellarly expanded. 

 Cephaloii partly flanked by the side-plates of tlie lirst segiiiciit of inesosome, latei'al lobes 

 well developed, frontal lobe more or less projecting, and distinctly defined from the 

 epistome. Metasome not abruptly contracted, epimcral plates of the third to fifth 

 segments prominent and recurved ; last segment couically produced. Eyes, as a rule, 

 well developed, subdorsal. Antennae moderately slender, witii the flagellum composed 

 of two articulations only. Oral parts normal. Legs gradually increasing in length 

 posteriorly, last pair in male sometimes slightly differing from that in female. (Opercular 

 plates of tlie two anterior pairs of jileojjoda, and so]netimcs of the three succeeding 

 pairs, provided with distinct air-cavities. Copulative organs of male of a similar structure 

 to that in Oniscus. Uropoda distinctly projecting, outer ramus lanceolate, inner much 

 smaller, lineai-, and originating far in front of the former." 



PORCELLIO SCABER, Latr. 



Porcellio .irahrr, Latrcillc, Hist. Nat. des Crustaces et dps Insecte^, vol. vii. p. 45. 



PorceUio xcaber, S])eiice Bate & Westwood, British Sossile-cyed Crustacea, ii. p. 475 (1808). 



Porcellio granir/er, White, List. Crust. Brit. Mus. p. yj (1847), sine descr. 



Porcellio (jraniyer, Miers, Ann. Mag. Nat. Hist. (ser. 4) xvii. p. '426 (1876), and Cat. New Zealand 



Crustacea, p. 99 (1876). 

 PorceUio (jraniijer , Budde-Lund, Isopoda Terrestria, p. 129 (1885). 

 Porcellio yranif/er, Budde-Luud, I.e. p. 149 (1885). 



Porcellio f/ranif/er, Thomson & Chilton, Trans. N. Z. Inst xviii. |). 158 (1886). 

 Porcellio (jraniger, Haswell, Cat. Australian Crust, p. 280. 

 Porcellio (/raiii(/er, G. M. Thomson, Proc. Royal Soc. Tasninnia, 1892, p. 4. 

 Porcellio scaher, Stehbing, History of the Crustacea, p. 427 (189."^). 

 Porcellio scaber, G. O^ Sars, Crustacea of Norway, ii. p. 17() (1899). 



Specijic Characters. — " Body oblong-oval, about twice as long as it is broad, dorsal 

 face slightly convex and very rough, owing to the preseaoe of numerous rounded 

 tubercles. Cephalon with the lateral lobes rather large and rounded, frontal lobe less 

 prominent, obtusely triangular. Side-plates of mesosome of moderate size, witli the 

 posterior corners acutely produced. Metasome occupying about one-quarter of the 

 length of the body ; cpimeral plates of the third to fifth segments strongly recurved ; 

 last segment rather produced, terminating in an acute point slightly grooved dorsally. 

 Antennae less slender, scarcely attaining half the length of the body ; flagellum about as 

 long as the last peduncular joint, and having its two articulations of nearly equal size. 

 Last pair of legs differing but little in tlie two sexes. Opercular plates of only the two 

 anterior pairs of pleopoda with air-cavities. Uropoda with the outer ramus broadly 

 lanceolate, and comparatively larger in male than in female. Colour of dorsal lace 

 generally of a uniformly greyish black; sometimes, however, lighter, and variegated 

 with irregular dark patclies, more rarely black, with the side plates light yellowish. 

 Length of adult female 14 mm." (Sars.) 



SECOND SERIES. — ZOOLOGY, VOL. VIII. 21 



