ON NEW AND RARE BRITISH SPIDERS. I 67 



over it. In the form of the caput this species bears considerable 

 resemblance to that of D. permixiiis, Cambr., but it is of a 

 larger size and altogether of a stouter form. The palpi and 

 palpal organs are very like those of D. adjacens ; but the 

 structure of some portion of these organs in this latter species 

 differs. 



Female examples, differing in some slight degree from females 

 of D. adjacens, were found in company with the males. Both sexes 

 apparently of both D. Jacksonii diwd. D. adjacens ^(txo. found on, or 

 near, the same spots (though in differing numbers and propor- 

 tion of the sexes), so that it is scarcely possible to say for certain 

 which form of the female belongs to the one or to the other 

 of the two species. The female which I have allocated to 

 D. adjacais seems to be, from its occurring most numerously 

 with the (as yet) more abundant males, and from other circum- 

 stances, probably rightly allocated. 



Examples of this most interesting and distinct spider were 

 found among water-borne debris on the banks of the river Tyne, 

 at Hexham, by Dr. A. R. Jackson, with whose name I have great 

 pleasure in connecting it. 



Entelecara omissa, Cambr. Fig. lo. 



Brit, and Irish Spiders, p. 75 (i9oo)> and Proc. Dors. N. H. 

 and A. F. Club XXIII., p. 33, 1902. 



Length of the adult female, i-i6th of an inch. 



This female of this spider is of a short robust form. The 

 cephalothorax is as broad as long, rounded in front, and the 

 lateral marginal compressions are slight. The occipital portion 

 of the caput is very slightly and convexly raised. The colour is 

 a dull greenish olive brown with the normal converging grooves, 

 and the lateral margins indicated by a darker hue ; between the 

 occipital and the thoracic indentation is a large somewhat pent- 

 agonal dark patch, and the ocular area is dark. The height of 

 the clypeus, which is prominent at the lower margin, is halt that 

 of the facial space. 



