428 REV. 0. P, CAMBRIDGE ON NEW ARANEIDEA. [May 16, 
Genus SpHECOZONE ’, Cambr. 
SpHECOZONE NIGRA, sp. n. (Plate XXIX. fig. 4.) 
Adult male, length 1 line. 
The whole of the fore part of this Spider is deep brown-black, 
the falces and the extremities of the legs being rather the brownest ; 
and the abdomen is black. 
The general form and structural characters are very similar to 
those of S. rubescens, Cambr., the type of the genus; the Spider, 
however, is smaller, and differs totally in colours and in the structure 
of the palpal organs. Several bristly hairs spring from the upper- 
side of the caput, some from the ocular area curving towards and 
meeting others (stronger ones) curving towards them from the 
occiput. 
The palpi are of moderate length; the radial joint is of a some- 
what similar cup-shape to that of S. rubescens, but not nearly so 
large or developed ; the fore extremity on the upperside is produced 
and prominent, terminating in a bifid form. The digital joint is 
large and oval, but rather strongly and irregularly indented on the 
outer side towards its base. The palpal organs are highly de- 
veloped, prominent and complex, consisting of several very marked 
corneous spines and processes; one of the spines is of very great 
length, black, slender, tortuous and convoluted, ending in a long 
hair-like point, 
Received in Mr. Traill’s Amazon collection. 
ACHA, g. n. 
The little Spider on which this genus is based is closely allied to 
Theridion, Walck.; but the large size and prominence of the fore 
central pair of eyes, as well as the obtusely humped posterior ex- 
tremity of the abdomen, appear to exclude it from that genus. 
The eyes also (among other characters) separate it from Thwaitesia, 
Cambr., and Chrysso, ejusd. 
In the only example examined the legs of the fourth (or posterior) 
pair were wanting; but from the lengths and proportions of the 
three other pairs I should judge their relative lengths to be 1, 4, 2, 3. 
The legs are rather slender and tolerably long, furnished with hairs 
only, excepting three or four spines beneath the femora of those of 
the first and second pairs; each tarsus ends with three claws. 
Mawille and labium as in Theridion. 
Cephalothorax short and broad, with little or no lateral marginal 
constriction at the caput. 
Abdomen short, somewhat cylindric in form, bluntly produced, 
but not to any great extent, at its posterior extremity on the upper- 
side; probably the female would present this character in a much 
stronger degree. 
ACHAA INSIGNIS, sp. n. (Plate XXX. fig. 5.) 
Adult male, length 1 line. 
The whole of the fore part of this Spider is of a clear reddish 
P. Z. S. 1870, p. 733, pl. xliv. fig. 3. 
