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.) and E. brevipes (Westr.), but 

 differs remarkably in colours, and also in some other material respects. 



Erigone i^etabilis, 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. Iceta, 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 cephalo- 

 thorax ; and the sternum is covered with largish punctures or pock- 

 marks. 



The sides and hinder part of the abdomen are of a plain pale yel- 

 lowish 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. Iceta. 



A single example of the adult male was found among the examples 

 of E. Iceta in Mr. Emerton's collection. 



Erigone emertoni, sp. n. (Plate LV. fig. 6.) 



Adult male, length | 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 thatjof 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, 



