766 MR. A. G. BUTLER ON [Dec. 19, 
p- 237); falces large, powerful, cylindrical, narrowing towards the 
culm, where in the male there is a powerful curved spine; three 
strong acute teeth on each side; movable claw long, acute, and 
curved ; palpus of male rather long, with the bulb large, globular, 
and shining, altogether quite normal in structure, hairy ; abdomen 
oblong, rounded behind, truncated and obtusely humped in front, 
the anterior portion being distinctly higher than the posterior, but 
depressed transversely behind the anterior border, ventral surface 
very slightly convex; legs long, slender, very sparsely setose, their 
relative length 1, 2, 4, 3. Entire length, ¢ 63 millim., 2 11 
millim. 
East coast of Madagascar. 
PHORONCIDIIDS. 
PuHoroncip1a, Westwood. 
5. PHoroncipia aAuRATA. (Plate LVII. figs. 4, 4 a.) 
Phoroncidia aurata, Cambridge, Ann. & Mag. Nat. Hist. ser. 4, 
vol. xix. p. 31, pl. vii. fig. 9 (1877). 
Four examples of this rare and extremely beautiful species were 
obtained in the Betsileo country by Mr. Cowan. ‘Two of these are 
typical, the abdomen being of a fiery golden colour, with black 
spines upon red bases; the two others are considerably larger, and 
the abdomen is of a metallic silver colour, the spines black with red- 
brown bases, and the ocellations black. This form I propose to 
indicate as var. argentata (fig. 46). 
GAS TERACANTHID&. 
GASTERACANTHA, Simon. 
6. GASTERACANTHA COWANI, sp.n. (Plate LVII. figs. 5, 5 a.) 
This species will fall into the subgenus Isacantha, and comes 
nearer to a much larger (apparently undescribed) species, a dried 
example of which we possess from Ceylon, than to any thing else 
that I have seen. 
3. Cephalothorax, palpi, and legs blackish piceous ; tarsi banded 
with horn-yellow ; maxillee, labium, sternum, and abdomen black ; 
abdomen above shining blackish, the anterior border narrowly sordid 
yellow, a central longitudinal interupted line commencing in an 
elongated pentagonal spot in the middle of the anterior border pale 
ochreous. 
Cephalothorax quadrate, tumid on each side behind the caput, 
with strongly defined central impressed line, abruptly shelving at 
the back; eyes arranged much as usual, the central pairs forming a 
nearly equilateral quadrangle, the posterior pair slightly larger, and 
therefore apparently wider apart than the anterior pair ; lateral eyes 
small, and forming the apices of the anterior angles of the caput, 
which ascend obliquely in the form of depressed cones from the 
sutural depression between the caput and the tumid thoracic region ; 
