new and rare British Spiders. 209 



Genus Drassus, Walck. 



Drassus inf meatus. 

 Drassus iiifuscatus, Weatr. Ar. Suec. p. 347. 



An adult female occurred among dead leaves and moss in a 

 wood at Bloxworth at the end of September 1878. It is 

 closely allied to Drassus troglodytes, C. Koch, and to Drassus 

 criminalism Cambr., but differs from both in the form and 

 structure of the genital aperture. 



Genus Peostiiesima, L. Koch. 



Prosthesima Latreillii. 



Prosthesima Latreillii, Sim. Arachn. d. France, iv. p. 02. 

 Mdanophora atra, C. Koch, Die Arachn. vi. p. 88, Taf. cci. fig. 49o. 



Two adult examples (one of each sex) of this spider were 

 found on Bloxworth Heath in May 1877, but were at the 

 time mistaken for Prosthesima nigrita, Fabr. (Drassus pusil- 

 lus, Bl.). An adult female was received in the spring of 

 1876 from Ventnor, and an adult male from Balmoral, where 

 it was found in June 1879 by Col. Pickard, R.A. I also 

 met with a female and its egg-cocoon under a stone at Pox- 

 well, near Weymouth, at the beginning of July 1879. The 

 egg-cocoon is of a lenticular form and of a dark yellowish 

 red-brown colour. 



Although very similar in general appearance to P. nigrita. 

 the male may be distinguished at once by the structure of the 

 palpi ; and the female by the form and structure of the genital 

 aperture. 



Prosthesima longipes. 



Mdanophora longipes, L. Koch, Die Arachn.-Fain. der Drassiden, 

 p. 147, pi. vi. figs. 88, 89. 



Adult and immature examples of both sexes of this spider 

 were found on Bloxworth Heath, under old turves and among 

 moss and heather, in September 1878. It may be distin- 

 guished from its congeners by the much longer and more 

 slender legs, as well as by the structure of the palpi of the male, 

 and the genital aperture of the female. 



Prosthesima latitans. 

 Mdanophora latitans, L. Koch, E. Simon, Arachn. d. France, iv. p. 70. 



An adult male of this species was found near Lulworth 

 Cove, Dorsetshire, on the 20th of June, 1878. It is closely 

 allied to Prosthesima Pettvern, Scop. (Drassus ater, Bl,), 



