METTUS.—THERIDION, 293 
Legs short, not very unequal in length, 4, 1, 2, 3, tolerably strong, furnished with hairs and a few slender 
bristles only ; tarsi ending with three claws, the superior pair long, not very strongly curved, and with 
apparently only two minute denticule beneath each near the middle. 
Falces small, weak ; fang short. 
Maxille moderate in length, broad at their extremity, inclined to the labiwm, which is broad, very short, and 
its apex truncate. 
Sternum heart-shaped, longer than broad, obtusely pointed behind, where it bends upwards between the coxe 
of the fourth pair of legs. 
Palpi truncate, with a strong, slightly curved, rather obtuse terminal claw, having some long fine denticu- 
lations beneath its anterior half. 
Abdomen oblong-oval, broadest towards its posterior extremity, and considerably projecting over the base of 
the thorax. 
Mettus reclivis, sp. n. 
Adult female, length 14 lines (25 millim.). 
The cephalothoraa is yellow-brown, with a blackish marginal line; the ocular area black. 
The falces are a little paler than the cephalothorax. 
The legs and palpi orange-yellow. 
Masille and labium yellow-brown. 
Sternum yellow-brown, with a pale yellowish wedge-shaped central longitudinal stripe at its hinder extremity. 
Abdomen thinly clothed with short hairs, and of a dull luteous-brown colour, palest underneath, and with a pale 
dull yellowish blotch just above the spinners. The genital aperture is not conspicuous, but is of 
characteristic form. Spinners short, compact, the four outer ones of about equal length, 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
THERIDION, Walckenaer. 
Theridion vivum, sp. n. 
Adult female, length slightly over ? of a line. 
This spider is of ordinary general form and structure. 
The cephalothorax is of a pale orange-yellow. 
The eyes are small, subequal, on black spots, and in the normal position ; those of the posterior row are 
equally separated by nearly two diameters’ interval. The fore-central eyes are largest. The two rows 
are nearly equal in length, and are equally but not strongly curved ; the convexity of the curve of the 
posterior row is directed backwards, that of the anterior row forwards. The central quadrangle is a 
little broader than long, and its fore side shorter than the hinder one. The height of the clypeus is 
equal to more than half that of the facial space. 
The legs are rather long, 1, 4, 2, 3, but not greatly differing in length, slender, furnished with hairs and a 
few prominent slender bristles, and of a bright orange-red hue. 
Palpi rather long, similar to the legs in colour and armature, and ending with a minute pectinated claw. 
Falces moderate in length and strength, straight and similar in colour to the cephalothorax. 
Mawille and labium normal, and like the falces in colour. 
Sternum broadish heart-shaped, broadly obtuse at its hinder extremity, and its colour is like that of the 
cephalothorax. 
Abdomen short-oval, not excessively convex above, of a uniform dull luteous-yellow colour, and covered very 
thinly with short hairs; one or two examples showed traces of obscure dusky blotches and markings, 
but no definite traceable pattern. Genital aperture not conspicuous, but of characteristic form. Spinners 
short, convergent, and of a dull orange-yellow colour. 
Hab. Costa Rica (Sarg). 
