88 Mr. F. O. P. Cambridge on Cteniform Spiders 



($ . — Colour. Carapace, abdomen, and legs unicolorous 

 brown. 



Structure. General characters similar to those of others of 

 the group. Ocular quadrangle longer than broad ; second 

 row of eyes procurved. 



Protorsus iv. very strongly curved, so that the convexity 

 of the basal section lies inwards, while the apical section is 

 straight and the tarsus is set on obliquely or almost at right 

 angles to the protarsus, its apex directed inwards. A detailed 

 description of this portion of the structure and of the tibial 

 spur is given in the table of specific characters. 



Palpal organs. i\Iarginal spine trifid at apex; central lobe 

 small, broad, rounded at apex, simple. 



For notes on C medius, Keys., $ , see p. 81. 



A single specimen of the male and another of the female of 

 this extraordinary spider were found in a collection from 

 Theresiopolis, S. BraziL The female is identical with 

 C. medius, Keys., of whicli the type is now before me, easily 

 recognizaljle hy the pair of oval boss-like prominences lying 

 obliquely and convergent at the anterior margin of the vulva. 

 These types are from Rio Janeiro. It is interesting to find 

 that the male of this very ordinary looking female should be 

 so extraordinary in appearance, owing to its excentrically 

 developed posterior legs. 



Part IL — (a) Genera of the Old and New Worlds which have 

 been assigned by various authors to the families CtenidsE 

 and Lycosidai, containing Forms possessing three tarsal 

 claws, with Notes on the 2ype Species. 



1872. Se7iocuhis, Tacz. Hor. Soc. Ent. Ross. ix. p. 108, t. iii. fig. 4. 

 Type iS. maro7iiais, Tacz. — St. Laurent de Maroni. 



1876. Nilus, Cambr. Spid. Palest. Egypt, p. 696, pi. li.x. lig. ]3. Type 

 N. curtus, Cambr. — Alexandria. 



1878. Pycnoctenus, L. Koch, Arach. Austr. ii. p. 996, pi. Ixxxvii. fig. 2. 

 Type P. rohustus, L. K. — Sydney. 



1873. Labdavus, Cambr. Proc. Zool. Soc. p. 118. Type Z. monastoides, 

 Cambr., $ . — Rio Grande, Brazil. 



1878. Ci/clocfmvs, L. Kocli, Aracli. Austr. ii. p. 988, t. Lxxxvi. 3. Type 

 C.Jlavici'ps, L. K., 5 . — iS'ew Holland. 



1880. Stenodenus, Keys. Verb. z.-b. Ges. Wien, xxix. p. 340. Type S. gra- 

 cilis, Keys., $ . — Peru. 



1880. Platyctenus, Keys. Verb. z.-b. Ges. Wien, xxix. p. 338, note. 



1880. Ancyclometes, Bertk. M^m. Cour. Acad. Belg. xliii. p. 114. Type 

 A. vulpes, Bertk., 5 . — Barbacena. 



