and Systematic Arrangement of British Spiders. 447 



Some difference of opinion has existed among arachnologists 

 as to the position this spider should occupy in a systematic 

 arrangement of the Araneidea ; but I do not see any sufficient 

 reason for removing it from the Theridia, to which it appears to 

 be most nearly allied by its organization. 



In Denbighshire this species is found among heath, but it is 

 of rare occurrence. The radial and digital joints of the palpi 

 are so closely connected in the male as scarcely to present any 

 perceptible trace of their union ; in short, as they appear to be 

 incapable of separate motion, there seems to be an impropriety 

 in regarding them as distinct joints. 



99. Theridion filipes. 



Theridion filipes, Blackw. Lond. and Edinb. Phil. Mag. Third Se- 

 ries, vol. viii. p. 484. 



Linyphia concolor, Wider, Museum Senckenb. B. i. p. 267. taf. 18. 

 fig. 3 ; Walck. Hist. Nat. des Insect. Apt. t. ii. p. 270. 



Theridion filipes is allied to the spiders belonging to the genus 

 Neriene by the disposition and relative size of its eyes, and to 

 those of the genus Linyphia by the length and delicacy of its 

 limbs ; indeed, on a superficial view, it bears a striking resem- 

 blance to Linyphia tenuis ; but the structure of the maxillse and 

 the relative length of the legs have induced me to class it with 

 the Theridia. It occurs under stones in woods in Denbighshire 

 and Lancashire. 



The first individual examined by me was a female, and it pre- 

 sented an anomaly in organization which I never before witnessed 

 in this order of animals ; it had a supernumerary eye situated 

 between the two small ones constituting the anterior pair of the 

 trapezoid. 



M. Walckenaer has inadvertently placed the Linyphia concolor 

 of M. Wider, which is identical with Theridion filipes, among the 

 synonyma of Argus graminicolis, having previously described it 

 as a distinct species under the name conferred upon it by M. 

 Wider (Hist. Nat. des Insect. Apt. t. ii. pp. 270, 351). 



Genus Pholcus, Walck. 

 100. Pholcus phalangioides. 



Pholcus phalangioides, Walck. Hist. Nat. des Insect. Apt. t. i. p. 652 ; 



Latr. Gen. Crust, et Insect, torn. i. p. 99 ; Hahn, Die Arachn. 



B. ii. p. 34. tab. 50. fig. 119 ; Koch, Uebers. des Arachn. Syst. 



erstes Heft, p. 20 ; Blackw. Linn. Trans, vol. xix. p. 125. 

 opilionoides, Koch, Die Arachn. B. iv. p. 95. tab. 135. fig. 311. 



Living specimens of Pholcus phalangioides were brought to me 



