138 . ARANEIDEA. 
black dash on each side towards the fore part, and a central longitudinal dark brown tapering stripe 
on the fore part, the latter defined by a slender pale line on each side and going off into a fine line at its 
hinder extremity. The underside is pale yellow-brown, with indications of a darker central longitu- 
dinal band, and with four black spots in two pairs near the middle. 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
T am unable, even with a strong microscopic lens, to discover the additional eyes 
which M. Simon accredits to this genus in his recent work (Hist. des Araignées, 2nd 
edition, 1892, p. 217). 
XYSTICUS, C. Koch. 
Xysticus pellax, sp. n. 
Adult male, length 23 lines. 
In size, general appearance, and markings this spider closely resembles some varieties of X. pint, Hahn, but 
it may be at once distinguished from that species by the very different form of the palpal processes. 
The cephalothorax is deep brown, with a broad longitudinal central band, containing the normal spade-marking, 
pale dull yellowish-brown; this marking runs a little into and spreads each way over the hinder part of 
the ocular area, and has its sides, as it runs backwards, parallel, and its point at the posterior end rather 
abrupt; in front of this marking and running transversely through the ocular area is a curved pale 
whitish stripe or strong line. The cephalothorax is thinly covered with short, erect, spine-like bristles, and 
the height of the clypeus is about two-thirds that of the facial space. 
The eyes are normal. The quadrilateral figure formed by the four centrals is a square, excepting the anterior 
side, which is slightly shorter than the others. The curve formed by the anterior row is rather stronger 
than in the European forms. 
The legs are moderate in length and strength ; they are of a pale whitish hue; the coxe and femora closely 
spotted with minute dark brown points, and striped longitudinally with dark brown. The genual, and a 
small portion at the posterior extremity of the tibial, joints are dark brown, and the rest of the tibie and 
metatarsi are thinly and minutely speckled with brown, and marked with very fine brown longitudinal 
lines. The legs are clothed with very short fine hairs and armed with spines. 
The palpi are short, yellow-brown and whitish in colour. The radial joint is stronger than the cubital, and is 
furnished with strong bristly hairs; it has a strong obtuse apophysis underneath, and a pointed one at its 
extremity on the outer side, the point being in contact with a small pointed prominence near the base on 
the outer side of the digital joint ; this last joint is of tolerable size, very short, and of a round-oval form. 
The palpal organs are simple, surrounded by a marginal, slender, circularly coiled spine and two short, 
rather strong, curved, sharp-pointed, claw-like spines in the middle, and opposed to each other. 
The mawille, labium, and sternum are of normal form, of a pale ground-colour, densely covered with minute 
dark brown points. 
The falces are small, subconical, vertical, of a pale whitish colour, all except the extremity thickly but minutely 
spotted with dark brown. 
The abdomen is short, broadest towards the hinder part, covered with short strong prominent bristles; on its 
upperside above there is the ordinary Thomisid pattern, dark brown, tinged with yellowish on a whitish 
ground; along the middle of the upperside is a rather characteristic clear pale whitish longitudinal line 
or narrow stripe; the sides are rugulose, obliquely lined or striated with black, and the underside is 
thickly mottled with pale yellow-brown. . 
Hab. Mexico, Amula in Guerrero (H. H. Smith). 
