1908.] TERRESTRIAL ISOPODS FROM TANGANYIKA. 555 



1879. Jletoponorthus pruinosvs Budde-Lund, Prospectus Crust. 



Isop. terrest. 4. 

 1885. 2Ietopo>iorthi(.s ^^i'uinosus Budde-Lund, Isopoda terrestria, 



p. 169. 



Of this well-known and widely distributed species there is a 

 single specimen in the collection, found under stones on beach, 

 Island Camp, Birket el Qurun. 



Anchiphiloscia Stebbinsf. 



Abstr. P. Z. S. 1908, p. 28 (May 26). 



Mandibles with setulose lobe adjoining the inner cutting-plate, 

 and with two to three plumose setae between this lobe and the 

 imjointed plumose lash which represents the molar. First maxilla? 

 with eight spines at the apex, and the strongly sinuous distal part 

 of the outer margin fringed with fine setules, which are much 

 longer proximally and a little longer distally than those in the 

 middle of the series. Second maxilla? with a small, clearly defined, 

 finely setulose inner plate, not longer than broad ; the outer part 

 of the maxilla much broader, pellucid, almost unarmed, without 

 apical cleft. Maxillipeds with terminal joint of palp distinguish- 

 able from the second. Telsonic segment triangular. 



The genus Fhiloscia was established by Latreille in 1804. 

 Both in French and Latin the name is on that occasion printed 

 Philoscie, but it has always been presumed that the Latin form 

 was due to a printer's error. Oniscus sylvestris Fabricius, which 

 is the same as the earlier 0. imoscorxijVi Scopoli, is the only species 

 mentioned in connection with the genus at its institution. In 

 any re-arrangement, therefore, of the very numerous forms which 

 are at present united under Latreille's generic name, it is clear 

 that Scoj)oli's species must be the standard for those to be 

 retained under Philoscia. 



The new genus characterised above agrees in general with the 

 definition of Philoscia given by Budde-Lund in 1885 (Isopoda 

 terrestria, p. 207), A. Dollfus in 1897 (Feuille des Jeunes Natu- 

 ralistes, No. 317, p. 1), and Sars in 1898 (Crustacea of Norway, 

 vol. ii. p. 172). Thus, it has the body oval or elongate, scarcely 

 contractile. The lateral lobes of the head are sharply deflexed. 

 The first segment of the pera^on has the hind margin i-egularly 

 curved. The pleon is more or less abruptly nai-rower than the 

 perfeon. The second antennae are slender, with three-jointed 

 flagellum. The i-ami of the urojjods extend beyond the telsonic 

 segment, and the inner ramus is articulated to the peduncle not 

 far in front of the outer. 



On the other hand, in the mandibles, where P. mitscorum has 

 only one penicil oi- plumose seta, the new genus has three penicils 

 on the left and two on the right mandible. In this respect 

 it agrees with the minutely described and carefully illustrated 

 Anaphiloscia shnoni Racovitza (Arch. zool. exj^erimentale, vol. vii. 



