764 MR. A. G. BUTLER ON [ Dec. 19, 
This and the following are allied to C. quadrata of Ceylon; if 
therefore the latter should be removed from the genus, they must 
go with it. 
2. Curysso Nivipictus, sp.n. (Plate LVII. figs. 1, 1a.) 
Q. Falces, maxillee, labium, sternum, and legs of a clear pale 
yellow colour ; the cephalothorax above black, witha lateral (almost 
marginal) pale yellow stripe on each side of the thoracic region ; abdo- 
men above black, spotted with white as follows :—two small dots in 
the centre of the anterior region, two large transverse oval spots, one 
on each side behind these, two small spots beyond the middle, fol- 
lowed immediately by three large almost confluent spots, the central 
one transverse and with a small spot behind it; ventral surface 
shining black. 
Cephalothorax slightly broader than long, expanded laterally in a 
regular arch behind the caput, and depressed at the back; caput 
similar in form to that of the preceding species, but the base of the 
falces rather more strongly indented in front; the anterior central 
and lateral eyes are also similar, but the posterior central eyes are 
smaller; the central oculiferous area represents a cone, the apex 
of which is truncated; between the two central pairs of eyes is a 
long bristle directed forwards and emitted from behind the eyes; 
the lateral margins of the head are sharply carinated and divided by 
a broad oblique shallow groove from the thoracic region; the abdo- 
men is quadrate, diamond-shaped, the lateral and posterior angles 
acute and spine-like, the dorsal surface very convex, rugose, the 
stigmata represented by shallow depressions, the ventral surface is 
keeled ; the legs are slender, cylindrical, sparsely setose, their rela- 
tive length J, 4, 2,3. Entire length of body and cephalothorax 
23 millim. 
One example: Central Madagascar. 
Tuawarirtesia, O. P. Cambridge. 
This genus was described last year (P. Z.S. 1881, p. 766) for a 
Cingalese species; and in this year’s ‘ Proceedings’ two additional 
species from the Amazons were added (see above, pp. 431, 432). 
3. THWAITESIA PULCHERRIMA, sp. un. (Plate LVII. figs. 7, 
7 a, 6.) 
Nearly allied to T. margaritifera, from which it differs apparently 
in the form of the abdomen and its somewhat brighter coloration ; 
the abdomen is ornamented above with a large brown cruciform 
marking which passes into the lateral articulations. 
@. The cephalothorax is pale yellow, adult examples having a 
more or less defined longitudinal dorsal carmine-red band from the 
oculiferous region backwards; the eyes are black ; the legs agree in 
colour with the cephalothorax ; the articulations of the tibiz and 
metatarsi of all the legs are more or less strongly banded with car- 
mine, a portion of the extremities of the metatarsi being also red, 
excepting those of the front pair of legs, which are brown ; the fine 
