352 Mr. F. O. P. Cambridge on the 
¢ .—Colour. Carapace dull mahogany-brown, with broad 
lateral marginal pale band, their inner margins subparallel, 
extending from exterior angles of clypeus to the base. Abdo- 
men dark olive-brown above, with broad marginal pale yellow 
band extending from anterior shoulders to spinners. Uni- 
colorous beneath. Mandibles unicolorous brown, Legs and 
palpi pale ochreous. ibiee, protarsi, and tarsi clothed with 
fine lateral barbules (curving hairs, such as are found on the 
feathers of young birds). Protarsi and tarsi clothed with 
dull yellow-white pubescence above, more conspicuous than 
on other segments. 
Structure as in generic diagnosis. 
Vulva broader than long (PI. IV. fig. 18). 
A single female in the Natural History Museum from 
Borneo. 
Thalassius Doleschallit, sp. n., @ ad. 
(Pl. IV. fig. 19.) 
Type in coll. Brit. Mus. Nat. Hist. 
Hab. Borneo. 
¢ ad.—Tot. len. 20°5 mm., carap. 7°5x6°5; legs i. 40, 
ii, 40, ii. 36°5, iv. 41°5; pat.+tib. i. and ii. 13, ii. 11°35, 
iv. 13°5; prot. 1. and ii. 8°5, il. 8, iv. 9°75. 
9? .— Colour precisely the same as in the last species, but 
the colour of the dorsal area between the white lateral bands 
is rich chocolate-brown and the legs are shorter in proportion 
to the trunk. 
Structure as in generic diagnosis. 
Vulva longer than broad (Pl. IV. fig. 19). 
A single female in the Natural History Museum from 
Borneo. 
The two species may be determined by the following 
table :— 
A. Size larger, 25 mm., carapace 10°5, leg iv. 60. 
Central anterior eyes distinctly larger than 
central posteriors. Vulva broader than long. 
Basal disk oval-oblong, with transverse fold 
TIGAY POSLELIOL MALLIN a5. naw alee ss ose cleriete T. Simont, sp. n. 
B. Size smaller, 20°5 mm., carapace 7°5, leg iv. 41:5, 
Central anterior eyes equal to central poste- 
riors. Wulva longer than broad. Basal disk 
triangular, without any transverse fold...... T. Dolesehallit, sp. n. 
Species assiyned to Thalassius, Sim. 
1885. Thalasstus marginellus, Sim. Spec. juv. Bull. Soc. 
Zool. Fr. x. p. 13. 
M. Simon notes an immature example of the genus Tha/as- 
