118 Mr. J. Blackwall on the Sti-ucture, Functioyis, (Economy, 



After Theridion albens in the catalogue (Annals and Mag. of 

 Nat. Hist. Second Series^ vol. viii. p. 445) add 



Theridion flavo-maculatum. 



Micryphantes flavo-maculatus, Koch, Die Arachn. B. iii. p. 6". 

 tab. 95. fig. 220. 



An adult male Theridion flavo-maculatum, which hitherto ap- 

 pears to have escaped the observation of arachnologists, was found 

 running on a foot-path in a wood near Oakland in May 1852. 

 The female of this species^ previously described and figured 

 by M. Koch under the name of Micryphantes flavo-maculatus, 

 judging from the smallness of its size, was probably an immature 

 individual ; its colours, though not so intense, bear a close re- 

 semblance to those of the male in their distribution. A minute 

 examination of the essential characters of this spider has induced 

 me to remove it from the genus Micryphantes to that of Theri- 

 dion. 



Family LiNYPHiiDiE. 



Genus Linyphia, Latr. 



Linyphia crypticolens. 



To the synonyraa of this species, which is misspelled criptico- 

 lens in the catalogue (Annals and Mag. of Nat. Hist. Second 

 Series, vol. ix. p. 16), add the Meta cellulana of M. Koch (Die 

 ^Arachn. B. viii. p. 123. tab. 287. fig. 691, 692). 



After Linyphia tenuis in the catalogue (Annals and Mag. of 

 Nat. Hist. Second Series, vol. ix. p. 18) add the following spe- 

 cies. 



Linyphia terricola. 



Linyphia terricola, Koch, Die Arachn. B. xii. p. 125. tab. 425. 

 fig. 1047, 1048. 



This spider, which varies considerably in colour, bears a striking 

 resemblance to Linyphia tenuis ; but the more slender form of the 

 latter, the larger size of the anterior eyes of the trapezoid, which 

 are somewhat wider apart, and are seated on a less prominent 

 protuberance of the cephalo-thorax, together with slight modifi- 

 cations in the structure and development of the palpal organs of 

 the male, serve, independently of colour, to distinguish it from 

 the former. Linyphia terricola is common among moss growing 

 in woods in many parts of England and Wales, and the sexes 

 arrive at maturity in July and August. 



The length of the male of this species given by M. Koch in 

 the text is incorrect, but the line representing it in the plate 

 rectifies the error. 



