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Show 774 REV. O. P. CAMBRIDGE O N N E W A R A N E I D E A . [June 21, Eyes considerably unequal in size ; the four smallest form a slightly curved transverse line a little way above the falces ; in continuation of the curve, at each end of the line, is a much larger eye, with another beyond it, behind, and lower down, seated on a strong tubercular prominence, The eight eyes may thus be said to form only one long transverse sinuous line, a position very unusual, and, in fact, almost (so far as I know) unique among the eight-eyed Spiders, approaching, however, somewhat near to that of Selenops, Dup. Legs rather short, laterigrade, not very strong, but tapering, not very unequal in length, (so far as I could ascertain) 1, 2, 4, 3 - 1 , 2 and 4 being very nearly equal, and 3 being not much shorter. They are furnished with hairs and also with long spines beneath the tibiae and metatarsi, arranged in two (parallel) rows, and terminate with three tarsal claws, the two superior ones curved and pectinated, the inferior one very small and most strongly curved. Palpi moderately long, and terminating with a curved pectinated claw. Falces short, conical, strong, and vertical. Maxilla moderate in length and strength ; enlarged and rather divergent at their extremities, where they are rounded on the outer sides. Labium somewhat oblong, (apparently) a little rounded at the apex, and about half the length of the maxillae. Sternum small, oval, pointed at its posterior extremity. Abdomen short-oval, fitting well up to the base of the cephalothorax. Spinners small, two-jointed. The anal tubercle is apparently two-jointed, and follows several rather conspicuously marked transverse folds in the epidermis, denoting no doubt obsolete segments of the abdomen. PERISSOBLEMMA THOMISIFORME, sp. n. (Plate LXVI. fig. 6.) Length of an immature female, 1-1 line. The cephalothorax, falces, maxilla, labium, and sternum are darkish dull brown, slightly tinged with yellow, and with traces of a paler ill-defined longitudinal central band. The legs and palpi are yellow, and the abdomen a little paler than the cephalothorax, with a short, narrow, central, longitudinal stripe of a darker hue on the fore part. The two central eyes of the long row in which the eight are disposed are larger than the one next to each, and are further from each other than each is from the next one to it; the eyes seated on each of the large tubercles at the extremities of the row are rather smaller than that next to each. A single example was contained in the Amazons collection sent to me by Prof. Traill. It is impossible to conjecture what size the adult form of this remarkable Spider may attain. Had it not been for the possession of three terminal tarsal claws, I should have concluded it to belong to the Thomisidae. It seems to me impossible to include it in any at present recognized family. Wherever, however, it may be eventually placed, the genus is a very distinct one. |