OCR Text |
Show 196 REV. O. P. CAMBRIDGE O N [Mar. 16, ERIGONE DORSUOSA, sp. n. (Plate XXVII. fig. 6.) Adult male, length f line. The cephalothorax of this Spider is of a pale dull yellowish colour slightly tinged with green ; it is short, rather flattish, and of a somewhat uniform convexity, the occiput, however, being rather gibbose, but not suddenly elevated; the summit of the gibbosity is furnished with a few very short hairs, and the profile line from the summit forms a slight but continuous curve; on each side of the summit is a large, longitudinal, 3trongly marked indentation or excavation ; and the normal thoracic indentations appeared to be marked by converging lines of very small punctures. The eyes are in two transverse lines or four pairs, as nearly as possible halfway between the lower fore margin of the caput and its summit; they are of ordinary size, those of the hind central pair are separated from each other by the distance of an eye's diameter, and are nearer together than each is to the the hind lateral on its side ; those of the fore central pair are smallest of the eight, contiguous to each other, and each is separated from the hind central eye nearest to it by the diameter of the latter ; those of each lateral pair are obliquely placed and coutiguous to each other, each being separated from the fore central eye on its side by an interval rather greater than that which divides the latter from the hind central eye nearest to it. The legs are short, slender, of a pale dull yellowish colour, furnished pretty thickly with hairs, and a few fine erect bristles on the upper sides; their relative length appeared to be 4, 1, 2, 3. The palpi are short, of moderate strength, and similar to the legs in colour ; the cubital joint is larger at its fore than at its hinder extremity ; the radial is shorter and has its fore extremity expanded, with a prominent but short curved point about the middle and a short truncated projection on its outer side, on the margin near which is a row of strong bristly hairs ; the digital joint is not very large, of an oval form, with a boldish prominence at the middle of its outer margin ; the palpal organs are well developed and moderately complex, at their outer extremity is a black tapering spine coiled in a circular form, and its prominent point is very close to that of another fine black spine which springs from within the coil of the other. The falces are of moderate length and strength, and project a little forwards ; they are armed with a row of very minute teeth on their inner margin forwards, and, like the maxilla and labium, are similar in colour to the cephalothorax. The sternum is of a dull blackish colour mixed with pale yellowish, very convex and glossy, and marked thinly with minute punctures. The abdomen is oval, but of a somewhat cylindrical form, and does not project over the base of the cephalothorax ; it is of a dull blackish colour, and (in spirit of wine) thickly mottled with pale yellowish points and some transverse angular lines in a longitudinal series on the hinder half of the upperside; the colour of the spinners is similar to that of the legs. A n example of this minute Spider was sent to m e in 1874 by M. |