501 



is easily distinguished from it by the construction of the male's palpi 

 and the form of the female's vulva. In size T. ferruginea is very 

 variable: I have females, in which the cephalothorax is nearly 6 mil- 

 lim. long, while in others, which, judging from the appearance of 

 the vulva, are fully developed, it is not more than 3 millim. 



In the male the femoral joint of the palpus is cylindrical, 

 without any protuberance on the outer side. The patellar joint is at 

 the apex, above, drawn out into a short protuberance directed for- 

 ward and upward. The tibial joint is somewhat irregular: viewed 

 from the side, it is considerably higher than it is long, viewed from 

 above, somewhat broader than it is long: its outer side is produced 

 in the form of a very coarse, sharp spur or spine bent forward near 

 the base and directed forwards and slightly upwards ; this spine, which 

 is curved slightly upwards towards the apex, is considerably longer 

 than the tibial joint. The bulbus is in front surrounded by a long, 

 strong, curved spine, and has on the under side an irregular, back- 

 ward-pointing appendage of a paler colour. 



The vulva consists of a large transversal fovea, about double 

 as broad as it is long, the anterior margin of which is curved in an 

 arc backwards, not elevated, covered by hair; the posterior margin, 

 which forms a strong brown costa, exhibits in the midst above and 

 somewhat posteriorly a deep and tolerably broad depression. The 

 middle part of that margin is somewhat drawn forward, so that the 

 fovea, when the hair has not been rubbed off, sometimes appears to be 

 imperfectly divided into two. The posterior centre eyes are the largest; 

 the anterior lateral eyes seem to me a little larger than the poste- 

 rior lateral eyes and the anterior centre eyes. The legs are usually 

 of a uniform yellowish brown colour, but sometimes they show some 

 indications of darker rings, especially on the under side of the po- 

 sterior thighs. The sternum is of a uniform yellowish brown colour, 

 as in T. vextita C. Koch. 



This species is perhaps identical with Aran, coarctata Duf. 

 1831'); but as Dufour describes the eyes of Ar. coarctata in the 

 following words: "Les yeux sont disposes absolument comme ceux de 

 VAr. domestique; ceux de la serie posterieure, les interme'diaires sur- 

 tout, sont un peu plus grands que les autres", I have not dared to 

 adopt the name coarctata (Duf.) for the species in question. 



1) Descr. ct tig. de qnelques Aran. nouv. ou mal connues, etc., in Ann. d. 

 Sc. Slat, XXII, p. 358, PI. X, tig. 1. 



