OCR Text |
Show 772 REV. O. P. CAMBRIDGE ON N E W ARANEIDEA. [June 21, beneath the posterior extremity of the sternum ; but it does not appear (as was suggested, Ann. N. H. loc. cit.) to be articulated or fixed to it. A single example received from the Amazons was in Mr. Traill's collection. Fam. APHANTOCHILI D^E. Gen. nov. BUCRANIUM. This genus is allied to Aphantochilus, Cambr., but may be readily distinguished by its shorter form "and the absence of constriction on the posterior part of the cephalothorax. The labium also, though very attenuated, is perfectly visible ; and the sternum, instead of being very narrow and duplex, is of au ordinary and rather broad heart-shape. The generic characters may be stated as follows :- Cephalothorax oval, broad, and truncated before, with a strong marginal lateral constriction at the caput. A strong, curved, tapering pointed horn-like projection issues laterally and forwards from each side of the anterior portion of the upper part. The eyes are unequal in size and placed in two transverse rows ; the anterior row straight, the posterior strongly curved, the convexity of the curve directed forward; those of each lateral pair, which are the largest of the eight, are widely separated from each other, and issue from close to the base (before and behind) of the horns. The four central eyes form a square whose anterior side is shortest. Legs not very long, slender, subequal in length, 4, 1, 2, 3, or 1, 4, 2, 3; furnished with hairs and a few short spines, the latter on the femora only. Each tarsus ends with three claws and a very small claw-tuft. Maxilla long, very strong at their base ; the upper parts much less strong and just meeting over the labium, which is long, very narrow, and pointed at its apex, being in fact of a lanceolate form. The sternum is short, broad, heart-shaped; the anterior margin slightly hollowed. The abdomen is short, somewhat oval, and separated from the cephalothorax by a distinct though not very long pedicle. BUCRANIUM TAURIFRONS, sp. n. (Plate LXVI. fig. 5.) Length of an immature female, 1^ line. The cephalothorax is yellow-brown, palest on the upper part of the caput; its surface is covered with small tubercles or granulosities, among which are ten or twelve stronger ones, armed with long, strong spines; the two strongest of these tubercles are placed in a short transverse line close to the thoracic indentation, and each is armed with two spines, the rest having but one each. The clypeus is very broad, projecting, and quadrate,with a strong subcorneal prominence at each of its lower corners, terminating with a prominent spine ; the height of the clypeus is equal to nearly half that of the facial space. Besides the spines already noted, each of |