On the Systematic Arrangement of British Spiders. 113 



XI. — Supplement to a Catalogue of British Spiders, including 

 remarks on their Structure, Functions, (Economy and Systematic 

 Arrangement. By John BlackwalLj F.L.S. 



Such additions and corrections as may tend to render more 

 complete my catalogue of British spiders, published in the 

 'Annals and Magazine of Natural History/ Second Series, vo- 

 lumes vii. viii. ix. and x., will be given in this supplement as 

 occasions present themselves. 



Tribe OCTONOCULINA. 

 Family Lycosid^. 

 Genus Lycosa, Latr. 



Lycosa campestris. 



To the notice of this species given in the catalogue (Annals 

 and Mag. of Nat. Hist. Second Series, vol. vii. pp. 257, 258), 

 the following fact may be added. In the spring of 1851 I cap- 

 tured an adult female Lycosa campestris which had only six 

 eyes; not the slightest rudiment of the lateral eyes of the ante- 

 rior row was perceptible, even with the aid of a powerful mag- 

 nifier. 



The tyro in arachnology may learn from this example, should 

 a similar instance of anomalous structure happen to come under 

 his observation, not to conclude too hastily that, because the 

 organs of vision are arranged symmetrically, he has discovered a 

 true Lycosa whose normal number of eyes is six. 



Lycosa cambrica. 



The following particulars in connexion with this species have 

 been ascertained since that part of the catalogue was published 

 m which it is introduced (Annals and Mag. of Nat. Hist. Second 

 Series, vol. vii. pp. 396, 397). In July and August the female 

 deposits between 60 and 70 spherical eggs of a yellow colour in 

 a globular cocoon of compact white silk, which is encircled by a 

 narrow zone of a slighter texture and measures ith of an inch in 

 diameter. 



On the 23rd of August 1851 I detected the apodous larva of 

 an insect in a cocoon of Lycosa cambrica, which had fed on the 

 young spiders as they were disengaged from the eggs; its abdo- 

 men of thirteen segments was short, broad, and of a pale brown 

 colour mottled with white. On the 28th of the same month it 

 spun an oviform cocoon of yellowish white silk of a slightish 

 texture, m which it died in the pupa state. 



Ann. ic Mag. N. Hist. Ser. 3. Vol. xi. 8 



