173 



of uropoda without any aiivcavities and scarcely bilobed. [Tropoda not much pro- 

 duced, with the inner ramus not attached so far in front as usual. 



Remarks. — This genus, established as early as in the year 18< >4 by La- 

 treille, is nearly allied to Oniscus, with which it agrees in the 3-articulate flagel- 

 lum of the antennae, but from which it is easily distinguishable by the far less 

 expanded lateral parts of the segments, and by the narrowness of the metasome. 

 Mr. Budde-Lund describes no less than 20 species from different parts of the 

 world, and adds several other species not examined by him. To the fauna of 

 Norway belongs only a single species, to be described below. 



Philoseia museorum, (Scopoli). 



(PI. LXXVI, fig. 1 .) 

 Oniscus museorum, Scopoli, Entomologia Cavniolica, pag. 415. 



Syn : Onisais sylvestris, Fabr. . 

 „ Philoseia marmorata, Brandt. 

 „ Oniscus agilis, Koch. 



Specific Characters. — Body oblong oval, slightly widening behind, greatest 

 width not attaining half the length, and occurring rather behind the middle ; dorsal 

 face moderately convex, and perfectly smooth, shining. Cephalon transversely 

 oval, with the frontal edge evenly arcbed. Side-plates of the 4 anterior segments 

 of mesosome but very slightly expanded; those of the 3 posterior segments some- 

 what more prominent, and terminating behind in obtuse points. Metasome very 

 small, scarcely exceeding Vs of the length of the body, and abruptly much nar- 

 rower than the mesosome, epimeral plates of 3rd to 5th segments comparatively 

 small and appressed; last segment subtriangular, flattened above, tip acute. Eyes 

 rather large and convex. Antennulae with the terminal joint shorter than the 

 basal one, and conically tapered. Antennae very slender and elongated, ex- 

 ceeding half the length of the body, flagellum longer than the last peduncular 

 joint, and having the 1st articulation as long as the other 2 combined. 

 Legs greatly increasing in length posteriorly, the anterior pairs in male densely 

 setous inside. Uropoda with the outer ramus lanceolate, inner not much. shorter 

 but narrower, and originating at a short distance from the outer. Colour of 

 dorsal face reddish brown or fulvous, with numerous irregular lighter patches 

 on each side of the median line, and a more regular series of similar patches 

 on each side of the mesosome, at the base of the side-plates; cephalon and [a 

 median band along the back generally dark brown; antennae and bases of the legs 

 banded with same colour. Length of adult female 8V2 mm. 



