348 



their extremities. Tho Labium is slightly less broad than high, and 

 rounded at its apex. The logs are also stronger than those of 

 Ocyale ; they are armed with strongor spines, and have a 

 scopula beneath the tarsi and metatarsi. Their relative length 

 is 4.2.1.3., but the actual difference is not great. 



The spiders of the genus Dolomedes, are of large size and of 

 semi-aquatic habits, being found in marshes and on the edges of 

 stroams, ponds, and lakes. They are able to run with facility on 

 the surface of the water, as well as to dive down and remain 

 beneath it for a considerable time. 



One specios only has been found in Britain, occurring also in 

 Dorsetshire. 



DOLOMEDES FIMBRIATUS. 



Dolomedes fimbeiatus, Walch., Blackw., Spid. Great Brit, and 

 Irel., p. 40, pi. ii., fig. 20. 

 „ ornatus, Blackw., loc. cit. p. 39, pi. ii., fig. 19. 



The longth of the male is from 4 J to 6 lines, and that of tho 

 female 10 to 11 lines. 



The cephalo-thorax of the male is deep brown, with a broad, 

 longitudinal, pale, yellowish band on each side, not far from tho 

 margin, and clothed thickly with short white hairs. 



The legs are long, strong (particularly the femora), and of a 

 brownish-yellow colour, tinged with red. 



The palpi are strong, moderately long, similar in colour to the 

 legs (excepting the digital joint, which is dark brown), and 

 armed with strongish spines. The radial joint is stronger than 

 the cubital, and has a not very large, tapering, pointed, slightly 

 curved apophysis at its extremity on the outer side, and a much 

 larger one underneath ; between these is a small, slightly curved, 

 pointed, black, tooth-like spine. The digital joint is large, con- 

 siderably dilated at its base on the inner side, and as long as tne 

 radial and cubital joints together. The palpal organs are rather 

 complex, with a curved filiform spine at their extremity. 



