OCR Text |
Show 1874.] NEW SPECIES OF ERIGONE. 435 short black hairs, and the middle of the upperside marked with four orange-yellow-brown impressed spots, forming a quadrangular figure, whose fore side is much the shortest. The genital aperture is simple and of a triangular form. Adults of both sexes of this pretty Erigone were contained in Mr. Emerton's series of North-American Spiders found at Cambridge, Mass.; it is allied to E. depressa (Bl.) andE. brevipes (Westr.), but differs remarkably in colours, and also in some other material respects. ERIGONE L^TABILIS, sp. n. (Plate LV. fig. 5.) Adult male, length | line. This Spider is very closely allied and very similar to the foregoing-species (E. lata); it may, however, be readily distinguished by its smaller size and (in the only example examined) paler colouring ; the humeral joint of the palpus is only of ordinary strength; the radial joint is stronger than in E. lata, and less produced in front at its extremity, which is rather abruptly terminated in a somewhat hooked form, and there is no angular point at the middle of the inner side ; the palpal organs differ a little in structure, and the coiled spine at their extremity is shorter, less strong, and less filiform at its point; the caput appeared to be quite smooth and destitute of punctures, which, however, were visible on the thoracic portion of the cephalothorax ; and the sternum is covered with largish punctures or pock-marks. The sides and hinder part of the abdomen are of a plain pale yellowish colour, and, as well as the upper coriaceous epidermis, thinly covered with black hairs. Unless the above points are carefully noted, this species will be easily confounded with E. lata. A single example of the adult male was found among the examples of E. lata in Mr. Emerton's collection. ERIGONE EMERTONI, sp. n. (Plate LV. fig. 6.) Adult male, length f line. The cephalothorax, falces, maxillae, labium, and sternum of this species are yellow ; the legs and palpi are of a paler yellow ; and the abdomen is of a dull pale drab colour, the greater part of its upper surface being covered by a coriaceous punctuose epidermis of a dull orange-brown colour ; the caput is slightly elevated and produced in a bluff form, the extremity, looked at in profile, having a somewhat truncate appearance; the ocular region is suffused with black, and furnished with some short bristly hairs ; the height of the clypeus (which is impressed across the middle) exceeds half that of the facial space. The eyes are on black spots, in four pairs, on the bluff end of the caput; those of the hind central pair are rather further from each other than each is from the hind lateral nearest to it; those of the fore central pair are the smallest of the eight, and contiguous to each other, each being separated from the hind central nearest to it by nearly the same interval as that which divides those of the hind central pair; those of each lateral pair are placed slightly obliquely, |