772 REV. o. p. CAMBRIDGE ON NEW 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. Aphantochilid^. 

 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 lahium also, though 

 very attenuated, is perfectly visible ; and the sternum, instead of being 

 very narrow and duplex, is of an 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. 



JMaxillcB 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 stermnn 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, Ij 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 

 subconical 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 



