800 Mr. J. Blackwall on some species of Araneidea. 



motion appears to occur in the other eyes, which are always 

 black. 



3. Thomisus trux. 



Length of the male yth of an inch ; length of the cephalo- 

 thorax ^ ; breadth y 1 ^ ; breadth of the abdomen T x ¥ j length of a 

 leg of the second pair J- ; length of a leg of the third pair -f . 



Mandibles short, strong, subcorneal, vertical, of a dark brown 

 colour with a red-brown spot in front. Maxillse convex near the 

 base, enlarged where the palpi are inserted, pointed at the extre- 

 mity, and inclined towards the lip, which is triangular : these 

 parts are brown. Sternum heart-shaped and yellowish brown. 

 Legs robust, provided with hairs and spines ; they are yellowish 

 brown, with the exception of the femora, those of the first pair, 

 the anterior half of those of the second pair, and the anterior 

 extremity of those of the third and fourth pairs being brownish 

 black faintly tinged with red; the first and second pairs are 

 considerably longer than the third and fourth, the second pair 

 being slightly the longest, and the third pair is the shortest of 

 all. Each tarsus is terminated by two curved, pectinated claws. 

 Palpi short ; the humeral and digital joints are dark brown, the 

 cubital joint is yellowish brown, and the radial reddish brown ; 

 the radial joint is much stronger than the cubital, and projects a 

 slender, slightly curved, pointed apophysis from its outer side, 

 which is very prominent, and an obtuse one on the under side, 

 which has a process at its base, on the outer side ; the digital 

 joint is oval, convex and hairy externally, concave within, com- 

 prising the palpal organs ; they are highly developed, compli- 

 cated in structure, with a strong prominent point near the mid- 

 dle, a filiform spine curved from the outer side round the extre- 

 mity and along the inner side, and are of a dark brown colour 

 tinged with red. Cephalo-thorax convex, compressed before, 

 truncated in front, abruptly sloping behind, with a very slight 

 indentation in the medial line ; the sides are black, comprising a 

 longitudinal band of a clear red-brown colour, and a broad band 

 of the latter hue extends along the middle. Eyes disposed on 

 the anterior part of the cephalo-thorax, which is provided with a 

 few strong black hairs directed forwards, in two transverse 

 curved rows, forming a crescent whose convex side is in front ; 

 the lateral eyes, which are seated on a protuberance, are much 

 larger than the intermediate ones, those of the anterior row being 

 the largest of the eight. Abdomen depressed, corrugated, par- 

 ticularly on the sides, thinly covered with short strong hairs, 

 broader at the posterior than at the anterior extremity, the latter, 

 which appears as if cut in a straight line across, projecting over 

 the base of the cephalo-thorax ; it is yellowish brown above, en- 

 circled by a band of yellowish white ; on each side of the medial 



