OCR Text |
Show 1873.] REV. O. P. CAMBRIDGE ON SIBERIAN SPIDERS. 449 In regard to the differences between the palpal structure of this and the other species mentioned, E. unicornis and E. kochii, it will be sufficient here to note that presented by the apophyses of the radial joint: in neither of these species do the two cross each other as in the present case ; in E. unicornis the extremity of the outer apophysis is dilated and not merely obtuse as in E. karpinskii, while the extremity of the inner one is not bifid as in this species ; in E. kochii the outer apophysis has its extremity not only dilated but strongly bifid, while its inner one is simply obtusely pointed. Both sexes of this very interesting Spider were contained in the Siberian portion of the collection received from M . Taczanowski ; and I have much pleasure in naming it after M . Karpinski, by whom the Kiew portion of the collection was made. ERIGONE (WALCKENAERA) DYBOWSKII, sp. n. (Plate XLI. fig. 13.) Adult male, length f of a line. The cephalothorax of this curious little Spider is short oval in form, and moderately convex above, and its colour is yellow, slightly suffused and marked on the margins and normal grooves and indentations with brown ; the caput is slightly raised on the upper part, the raised portion also marked out by a dusky blackish marginal line, indented at the occiput, immediately behind which is a depression. The clypeus exceeds in height half that of the facial space, and is prominent at its lower margin ; on either side of the upper part of the caput forwards and immediately behind each lateral pair of eyes is a small roundish pit or indentation, from which issues a small black, slightly curved, prominent, sharp, thorn-like spine ; this spine, from its nature and position, is a strong and remarkable specific character. The eyes are tolerably equal in size, and seated on small black spots; they are in four pairs, forming a rather narrow transverse oval figure, each pair being rather widely removed from the others nearest to it; those of the hinder pair appeared to be of an oval form and separated from each other by little, if any, more than half of an eye's diameter; those of the fore central pair are very near but (apparently) not quite contiguous to each other, and their straight line, when looked at from the front, is above that formed by the foremost eyes of the two lateral pairs; the eyes of each of these last pairs are contiguous to each other, and seated rather obliquely on a small tubercle; the figure formed by the eyes of the fore central and hinder pairs is a longish narrow trapezoid, whose length is nearly about double its breadth. The legs are moderately strong, but not very long; they are of a yellowish colour, strongly tinged with reddish yellow-brown, and furnished sparingly with hairs and a few short, erect, black bristles ; their relative length appeared to be 4, 1, 2, 3. The palpi are short and of a yellow colour, except the digital joint, which is brownish ; the radial is shorter than the cubital joint, and has three apophyses from its extremity -one (a small pointed one) on the outer side, a large broad one on the inner side, and PROC. ZOOL. S O C - 1873, No. XXIX. 29 |