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Show 1870.] REV. O. P. CAMBRIDGE ON THE GENUS IDIOPS. 107 wrinkles being sinuous, and with a longitudinal direction; each wrinkle is armed with a single and more or less complete row of short, strong, prominent, black spines; the hinder extremity of the abdomen has four largish, round, bare, black, slightly impressed patches, like seals; the two upper ones are the largest, and are wider apart than the two lower ones; the four form very nearly a square. The spinners (four in number) are short; the superior ones being the longest, strongest, and apparently biarticulate; the four spiracles are connected with conspicuous disks or plates of a reddish-brown colour, mixed with yellowish. A n adult male of this very distinct and remarkable Spider was received through Mr. S. Stevens, from the Swan River, West Australia, in 1864. 4. IDIOPS PETITII. Acanthodon petitii*, (Guerin-Meneviile) Voyage de la Favorite, cl. viii. pl. 16. figs. 1-8; Walck. Ins. Apt. tome ii. p. 234. Female adult, length 14 lines. Cephalothorax elongate-oval, contracted and elevated before, flattened on the sides and behind. Eyes eight, disposed in two separate groups ; the first, situated on the anterior margin of cephalothorax, is composed of two large eyes very near to each other, and placed on a tolerably strong tubercle; the second group is much further back, placed upon a strongish eminence, and forming a very narrow, transverse, oval figure; this group consists of six eyes, the two hindmost ones being rather the smallest. Palpi long, strong, and pediform, almost as strong as the legs, and armed beneath with short, strong spines, forming a sort of rake (rdteau). Legs longish and strong; relative length 4, 1, 2, 3 ; those of the first two pairs armed beneath the two last joints with short, strong spines similar to those beneath the palpi; each tarsus ends with three claws, the two superior ones much curved, and armed beneath, towards their base, with a strong tooth; the inferior claw is much smaller than the superior ones. Falces prominent, and armed in front with a group of strong spines. Maxillee and labium similar in form to those oi Idiops fuscus. Abdomen oval, hairy, of a pale dull brown colour, with some largish yellow spots beneath, near the branchial openings ; the colour of the cephalothorax, legs, and falces is a lively chestnut-brown, shining, and as if varnished. Spinners four in number and unequal in size. Branchial openings four in number, and placed in the usual position beneath the fore part of the abdomen. Hab. Brazil. 5. IDIOPS SYRIACUS, n. sp. (Plate VIII. fig. 3.) Female immature, length 3 | lines. The general colour of this species is yellow-brown, the cephalo- •» Named after Dr. M . Petit de la Saussaie, by whom it was discovered and presented to M . Guerin. |
