268 Mr. J. Blackwall on the Structure, Functions, (Economy, 



XXII. — A Catalogue of British Spiders, including remarks on their 

 Structure, Functions, (Economy, and Systematic Arrangement. 

 By John Blackwall, F.L.S. 



[Continued from p. 22.] 



141. Neriene munda. 



Neriene munda, Blackw. Linn. Trans, vol. xviii. p. 642. 



Argus mundus, Walck. Hist. Nat. des Insect. Apt. t. iv. p. 511. 



Adult males of this species occur in May and June among 

 rank herbage growing in woods about Llanrwst, and in 1840 I 

 received specimens of the same sex from Miss Ellen Clayton, 

 who took them near Garstang, in Lancashire. 



142. Neriene tibialis. 



Neri'dne tibialis, Blackw. Lond. and Edinb. Phil. Mag. Third Series, 

 vol. viii. p. 485. 



A few adult males of Neriene tibialis were taken in March 

 1835 under stones at Oakland. 



143. Neriene cornuta. 



Neriene cornuta, Blackw. Lond. and Edinb. Phil. Mag. Third Series, 



vol. hi. p. 190 ; Research, in Zool. p. 372. 

 Theridion bituberculatum, Wider, Museum Senckenb. B. i. p. 222. 



taf. 15. fig. 2. 

 Argus bituberculatus, Walck. Hist. Nat. des Insect. Apt. t. ii. p. 363. 



In May 1833 I discovered males of this remarkable spider, 

 which had acquired their full development, on rails and gates at 

 Oakland, and have since met with both sexes in the same locality 

 and at Crumpsall Hall. 



I have included the Theridion bituberculatum of M. Wider, and 

 the Argus bituberculatus of M. Walekenaer, which appear to be 

 identical, among the synonyma of this species, although they are 

 represented as differing from it and from each other in the 

 relative length of their legs, and also somewhat in colour. M. 

 Wider, in his description of Theridion bituberculatum, states that 

 " die Beine sind ziemlich kurz und nicht sehr ungleich, das dritte 

 Paar am kiirzesten, dann folgt das vierte, dann das erste und 

 das zweite ist das langste ; " and M. Walekenaer, in treating 

 upon the structure of Argus bituberculatus, remarks that "les 

 pattes sont peu allongees, la premiere paire est la plus longue, 

 ensuite la seconde, la troisieme est la plus courte." Now as 

 regards the legs of Neriene cornuta, the anterior and posterior 



