Rev. F. O. Pickarcl-Ciimbrltlgo on British Spiders. 37 



eyes had become entirely atrophied, ami not a trace of them 

 reniainecl ; in some cases the posterior centrals had dis.ip- 

 peared, while in otliers the central anteriors had coalesced, 

 forminj": an indistinct dark spot. Anterior row curved, con- 

 vexity forward ; centrals almost in contact, four diameters 

 from laterals. Posterior row curved, convexity backward ; 

 centrals two diameters ajiart, five from the laterals ; the four 

 centrals forming a quadrangle a little longer than broad. 



Clypeus quite twice the width of the ocular area, clothed 

 with numerous short hairs directed forwards. 



This sjiecies is closely allied to nn/ops and oblongum, but 

 can easily be distinguished from either. In mi/ops femora i. 

 has two spines only and in ohIon(jum one only. 



I should myself have been very much inclined to have 

 considered these sj)iders identical with myops, had not M. E. 

 Simon himself, to whom 1 submitted some examples, declared 

 that they were without doubt e(jeria. I have, however, never 

 seen the male of mijops^ and only a single specimen of the 

 female. 



Numerous specimens uf both sexes, adult and immature, 

 were taken by myself in the large cavern near Wells called 

 Wookey Hole, in May 1894. It is probable that no daylight 

 has penetrated its gloomy recesses for many thousand years; 

 hence the degeneration of the visual organs in these spiders. 



The first Jiritish specimens were taken near Kosslyn, in 

 Scotland, in 1893 and 1894 ('A List of the Spiders of 

 Edinburgh,' 1894, p. 5G0). 



For the table of specific characters of Porrkomma, vide Ann. 

 & Mag. Nat. Hist., Jan. 1894, p. 100, correcting as follows, 

 to include cgeria : — 



b. Anterior row of eyes strongly curved, comexity 

 forwards. Eyes of both rows very small and 

 wide a])art. Central posteriors two diameters 

 apart, four from laterals. 



1. Femora i. with two or more spines. Clypeus 



at least twice the height of the ocular area, 

 a*. Femora i. with two spines, ii. with one 



spine P. myops, Sim. 



h'. Femora i. with three epines, ii. with one 



spine P. egeria, Sim. 



2. Femora i. with a single spiiie only, ii. with 



none. Clypeus only one riunrtor higher than 



the ocular area P. oblongum, Cb. 



Genus Tetragnatha, Latr. 

 Teirafjnalha pinicoluj L. K. 

 Males were taken by myself in the Lake Districts in 



