84 
THOMISID^E. 
middle of the upper part; the anterior part of this band comprises five conspicuous, brown 
depressions; the three anterior ones describe a triangle whose vertex is directed forwards, 
and the other two are situated parallel to its base; two obscure, brown lines, forming a very 
acute angle whose vertex is directed backwards, occur between the depressions constituting 
the two posterior pairs; the sexual organs have a dark, reddish-brown tint; and the colour of 
the branchial opercula is pale-yellow. 
The male is much smaller, darker coloured, and less distinctly marked than the female. 
The cephalo-thorax has a red-brown hue, the band directed backwards from each lateral pair 
of eyes is black, and the lateral margins have a yellowish-white tint. The legs and sternum 
are of a red-brown colour, the latter being marbled with a deeper shade of red-brown. The 
falces have a brownish-black hue, with a red-brown mark in front which extends to the outer 
side. The maxillse and lip have a dark-brown tint, their extremities being the palest. The 
axillary and humeral joints of the palpi are of a dark-brown colour, tinged with red; the 
cubital and radial joints are of a red-brown hue, tinged with dark-brown, the latter being the 
darker, and the digital joint has a dark-brown tint; the radial joint is larger than the cubital, 
and projects from its extremity, on the outer side, two bifid apophyses; one branch of the 
superior apophysis is prominent, and the other is in close contact with the base of the digital 
joint, which joint is oval, convex, and hairy externally, concave within, comprising the palpal 
organs ; these organs are highly developed, complex in structure, with a pointed, prominent 
process at their base, and have a brownish-black tint. The upper part of the abdomen is of 
a red-brown colour, interspersed with a few black spots ; it is palest in the medial line, but the 
design of the broad, dentated band is almost obliterated; the frontal margin and a band 
extending along each side have a yellowish-white tint, and the under part is of a pale, red- 
brown colour. 
The abdomen of both sexes, when adolescent, is of a pale-yellow colour, with a few black- 
spots on the upper part. 
Adult and immature individuals of this species of Thomisus were discovered among grass 
growing in and near woods at Oakland, in August, 1852; and in 1858 specimens, taken in 
Scotland, were received from Mr. J. Hardy. 
Thomisus trux. PI. IV, fig. 50. 
Thomisus trux, Blackw., Annals and Mag. of Nat. Hist,, vol. xviii, p. 300. 
—— — Blackw., Annals and Mag. of Nat. Hist., second series, vol. vii, 
p. 451. 
Length of the male, jth of an inch; length of the cephalo-thorax, T ',th, breadth, -nth ; 
breadth of the abdomen, T \th ; length of a leg of the second pair, jth ; length of a leg of the 
third pair, jth. 
The legs are robust, and are provided with hairs and spines; they are of a yellowish- 
