and little-knoicn Arctic Spiders. 277 



absence of a small tooth-like spine on the underside of the 

 radial joint ; from E. spinosa, Camb., it maj be distinguished 

 easily by the direction of the prominent spur beneath the fore 

 extremity of the cubital joint ; in the present species this spur 

 lias a slightly backward direction, while in E. spinosa it is 

 directed strongly forwards : the same diiference is also observ- 

 able in E. psychrophila^ Thor., in which the long curved form 

 of this spur affords another remarkable distinction from E. 

 Whymjjeri. From E. remota the present spider differs at a 

 glance in the comparative shortness of the palpi, though it is 

 perhaps more nearly allied to this species than to either of the 

 others ; while from all the above-mentioned species the form 

 (before alluded to) of the radial joint of the palpus will readily 

 distinguish it : this joint, slender at its junction with the cubital 

 joint, enlarges gradually to its anterior extremity, where it is 

 divided, or continued, into two principal lobes or projections ; 

 the longest but least strong of these is situated behind and is 

 ]jointed at irs extremity, of a somewhat conical or subangular 

 form, and curved inwards towards the palpal organs ; the other 

 projection is formed by the production of the upper extremity 

 of the joint, rather on the inner side, into a broad, strong, 

 obtuse lobe, on the outer and upper margin of which is a pro- 

 minent, somewhat angular point, which has a slenderish, 

 slightly curved, blunt-pointed, prominent appearance from 

 some points of view. On the outer side of the radial joint are 

 a few black bristles, of which several form a small cluster 

 near its outer extremity. 



The digital joint is large, rounded at its base on the upper 

 side, and gradually tapering to its extremity ; it is longer than 

 the radial joint, and comprises the palpal organs, which are 

 Avell developed and complex. 



The eyes are nearly equal in size and are rather closely 

 grouped together ; the four forming the hinder row are equi- 

 distant from each other; the two central eyes of the front row are 

 near together but not quite contiguous to each other ; each is 

 separated from the lateral eye on its side by an interval about 

 equal to that which divides the two hind central eyes. The 

 four central eyes form very nearly a S([uare, the fore side being 

 the shortest ; those of eacli lateral pair are almost contiguous 

 and are situated upon a slight tubercle. 



In both sexes the lateral margins of the cephalothorax are 

 armed with tooth-like spines, those in the female being the 

 least conspicuous ; this lateral armature is usual in the males 

 of this group, but rare, so far as I am aware, in the females. 

 At this mcjuu-nt I do not remember its presence in any other 

 species ; but possibly it may exist in some other species, with 



Ann. & Mag. N. Hist. Ser. 4. Vol. xx. 20 



