and Systematic Arrangement of British Spiders. 39 



stituting a climbing apparatus ; it is not uncommon in the south 

 of England, and has been captured, in an immature state, in the 

 woods at Tan y Bwlch, in Merionethshire, by Thomas Glover, 

 Esq., of Smedley Hill, near Manchester. The sexes, when they 

 have acquired their full development, are very dissimilar, and 

 have been mistaken for distinct species. 



Family Drassidce. 



Genus Drassus, Walck. 



50. Drassus lucifugus. 



Drassus lucifugus, Walck. Hist. Nat. des Insect. Apt. t. i. p. 613 ; 



Sund. Vet. Acad. Handl. 1831, p. 138; Koch, Uebers. des 



Arachn. Syst. erstes Heft, p. 18. 

 melanogaster, Latr. Gen. Crust, et Insect, torn. i. p. 87 ; Hahn, 



Die Arachn. B. ii. p. 11. tab. 41. fig. 102. 

 Filistata femoralis, Wider, Mus. Senck. B. i. p. 206. taf. 14. fig. 5. 

 Pythonissa lucifuga, Koch, Die Arachn. B. vi. p. 54. tab. 194. 



fig. 468-470. 



According to Dr. Leach (Supplement to the 4th, 5th and 6th 

 editions of the ' Encyclopaedia Britannica/ article Annulosa) the 

 Drassus melanog aster of Latreille (Drassus lucifugus, Walck.) has 

 been found in England, under stones ; and on his authority I 

 introduce it here as a British spider, never having seen a native 

 specimen myself. 



Among the new genera proposed by M. Koch, for the recep- 

 tion of certain groups into which he has separated the Drassi, 

 are several including British species which I am not prepared to 

 adopt. 



51. Drassus ater. 



Drassus ater, Latr. Gen. Crust, et Insect, torn. i. p. 87 ; Walck. Hist. 



Nat. des Insect. Apt. t. i. p. 618; Hahn, Die Arachn. B. ii. p. 54. 



tab. 61. fig. 142; Blackw. Linn. Trans, vol. xix. p. 114. 

 Melanophora subterranea, Koch, Uebers. des Arachn. Syst. erstes 



Heft, p. 17 ; Die Arachn. B. vi. p. 85. tab. 201. fig. 491, 492. 

 pusilla, Koch, Uebers. des Arachn. Syst. erstes Heft, p. 17; 



Die Arachn. B. vi. p. 90. tab. 202. fig. 496. 



atra t Koch, Die Arachn. B. vi. p. 88. tab. 201. fig. 493. 



Filistata atra, Wider, Museum Senckenb. B. i. p. 202. taf. 14. fig. 2. 



In the mountainous parts of Denbighshire and Caernarvon- 

 shire this species is of frequent occurrence under detached pieces 

 of rock. When adult, the terminal joint of each intermediate 

 spinner is directed downwards at right angles to its base, and 

 the full complement of papillae or spinning tubes connected with 

 the short terminal joint of each inferior spinner is eight. Six of 

 these papillae, which are of large dimensions, are probably used 



