Regions of Lakes Nyasa and Tanganyika. 443 



Sparassus Fomasinii, Pavesi (Ann. Mus. Genova, xvi. 

 1881, p. 548), from Inhambane, is also quite a distinct 

 species, having the tibire of the legs banded below, the first 

 leg longer than the second, &c. This species is almost 

 certainly referable to the genus Palystes. 



SAROTESIUS, gen. nov. 



Carapace as wide as long, low, only lightly convex, resem- 

 bling that of Isopoda ; width of head about two thirds length 

 of carapace. Eyes of anterior line straight, subequal, dis- 

 tance between medians a little less than their diameter and 

 about half the distance between median and lateral on each 

 side ; eyes of posterior line straight, the laterals considerably 

 larger, subsessile ; the medians about three diameters apart, 

 about twice as far from the laterals as from each other ; 

 median ocular quadrangle scarcely wider behind than it is 

 long; slightly narrowed in front; posterior medians smaller 

 than anterior medians ; clypeus low, about half the diameter 

 of anterior median eye. 



Legs 2, 1, 4, 3, third and fourth much shorter than first 

 and second ; patella and tibia of fourth a little shorter than 

 tibia of second. 



Mandible with 3 — 3 teeth below, those of the posterior 

 series larger and subequal. 



Liabium wider than long, anterior edge transversely 

 truncate. 



Maxillce short, convex, their lateral edge without emargina- 

 tion in front of the palpus. 



In the arrangement of its eyes this genus resembles the 

 West-African form Remmius of Simon, except that the laterals 

 are less prominent. In Remmius, however, the cephalic 

 region is very broad and very high, whereas in Sarotesius 

 this area is not at all elevated in front of the thoracic fovea. 

 From Lsopoda, which has a carapace of the same form, this 

 new genus differs in the disposition of the eyes, those of 

 Isopoda being much more closely spaced. 



Sarotesius melanognathus, sp. n. (PI. XIII. figs. 6, 6 a.) 



Carapace castaneous, covered with yellow hairs, its length 

 about equal to that of tibia or protarsus of fourth leg, shorter 

 than palp by rather more than half the tarsus, equal to about 

 half the tibia and patella of second leg. 



Jfandibles black, scantily clothed with greyish hairs, mode- 

 rately prominent at the base. 



