Eev. F. O. Pickard-Cambridge on British Spiders. 37 



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

 remained ; in some cases the posterior centrals had disap- 

 peared, while in others the central anteriors had coalesced, 

 forming- 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 apart, 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 species is closely allied to myops and oblongum, but 

 can easily be distinguished from either. In myops femora i. 

 has two spines only and in ohloncjum one only. 



I should myself have been very much inclined to have 

 considered these spiders identical with myops^ had not M. E. 

 Simon himself, to wiiom I submitted some examples, declared 

 that they were without doubt egeria. I have, however, never 

 seen the male of myopSy and only a single specimen of the 

 female. 



Numerous speciinens of both sexes, adult and immature, 

 were taken by myself in the large cavern near Wells called 

 Wookey Hole, in May 1894. It is ])robable that no daylight 

 has penetrated its gloomy recesses for many thousand years ; 

 hence the degeneration of the visual organs in these spiders. 



The first British specimens were taken near Rosslyn, in 

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

 Edinburgh,' 1894, p. 560). 



For the table of specific characters of Porrhomma^ vide Ann. 

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

 to include egeria : — 



b. Anterior row of eyes strongly curved, convexity 

 forwards. Eyes of both rows very small and 

 wide apart. 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. mifops, Sim. 



6*. Femora i. with three spines, ii. with one 



spine P. egeria, Sim. 



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



none. Clypeus only one quarter higher than 



the ocular area P. oblongum, Cb. 



Genus Tetragnatha, Latr. 

 Tetragnatha pinicola^ L. K. 

 Males were taken by myself in the Lake Districts in 



