OCR Text |
Show 200 REV. O. P. CAMBRIDGE O N T W O [Mar. 18, The legs are, as described in the generic diagnosis, strong and minutely tuberculose, the tibiae being of a peculiar bent form. Two examples were found by Mr. Forbes, one in Java, the other in Sumatra. ORNITHOSCATOIDES TUBEROSA. (Plate XV. fig. 2.) Thomisus tuberosus, Bl. Ann. & Mag. Nat. Hist. ser. 3, vol. xiv. p. 38. Adult female, length 5 lines. This Spider, although very similar in general form and appearance to O. decipiens, is smaller, and differs in colours and also in the number and disposition of the abdominal tubercles. The abdomen is of a pale olive-brown colour on the upper side; six elongated black markings, three on each side, of different sizes, are continued laterally to the underpart of the abdomen; the hinder pair of these markings meet at tbe middle of the upper side, where are two shining dark-brown conical tubercles. The rest of the tubercles, which are much more numerous than in O. decipiens and vary a little in size, are very similar to the surrounding surface in colour, perhaps a little more of a yellow-brown hue, and all of a conical form ; they are somewhat symmetrically disposed towards the sides and at the hinder part of the abdomen. The underside is black, largely patched with cream-colour. The cephalothorax is yellow-hrown and slightly tuberculose, and the height of the clypeus rather exceeds half that of the facial space. The legs are cream-colour, marked with yellow-brown, excepting the anterior half of the tibiae, the metatarsi, and anterior portion of the tarsi, which are black-brown. Besides other spines, there are numerous long strong ones on the tibiae and metatarsi of the first and second pairs. There are also the same spines on the upper side of the femora as those whose peculiar function Mr. Forbes has noted in the Sumatran and Javan species. The first two pairs of legs are much longer and stronger than the rest, but they appear to be proportionately shorter than those of O. decipiens, as in that species the tibiae are bent, but not to so great an extent. The eyes do not appear to differ much in relative size and position from those of O. decipiens. The palpi are yellow-brown, all except the digital joints more or less suffused with cream-colour ; they terminate with a siugle curved pectinated claw. The fakes are short, strong, subcorneal, vertical, yellow-brown, with a whitish spot in front towards their base. The maxilla and labium are yellow-brown, and though shorter are of the same form as those of O. decipiens. Mr. Blackwall in his description (evidently by some inadvertence) describes the labium as triangular. Tbe sternum is dark brown, and can scarcely be described as, according to M r . Blackwall, heart-shaped, but of a rather elongate-oval form slightly pointed behind and hollow-truncate before. |