60 Mr. F. O. P. Cambridge on Cleniform Spiders 



of Ctenus or not, since we know of no New- World species 

 which we can with certainty assign to this genus, I would 

 prefer to leave it an open question. 



I have felt it necessary to enter thus minutely into the 

 matter because one ought not to rename forms which already 

 have been assigned certain names without making quite 

 clear one's reason for so doing. 



The type of Thaumasia^ Peity, is T. senilis^ Perty, being 

 the only species described under this generic title. Lepto- 

 ctenus agalenoidesj L. K., is the only species originally 

 assigned to the genus ; while of the two species of Argoctetius, 

 L. K., igneus and pictus, the type not having been men- 

 tioned, I select the first-named as the type of the genus ; but 

 of tlie four forms originally assigned to Microctenus by Key- 

 serling, I select the first, M. ornatiis, Keys. ; while Caloctenui 

 aculeatus, Keys., is the only species described in 1877, and 

 therefore will be the type of Calocterius, Keys. The type of tlie 

 obscure genus Anahita, Karsch, since assigned by Keyserling 

 to his interpretation of Ctenus^ Walck., is the species A. fauna, 

 Karsch, from Japan, being the only form then described. 

 Jsoctenus Jbh'iferus, Bertk., ? juv., from Brazil, transferred by 

 Keyserling to Ctenus, Wlk., is the only species described by 

 Bertkau, and must be its type. Of Ctenophthalmus, Sim., for 

 which, being a nom. preocc, Thorell proposed (Ann. Mus. 

 Gen. 2,xi. (xxxi.) 1891-92) the name Ctenomma, C. Uneatas, 

 Sim., remains alone as its type. Of the three species described 

 under Cupiennius, Sim., wlio has not definitely selected the 

 type, I select the first described, C. Getazi, Sim. The single 

 species described by Thorell under Nydia, N. punctatUf Thor., 

 remains the type ; while of Acanihoctenus, JLeys., A. spini- 

 gerus, K., the only species originally assigned, is the type. 

 Of Acantheis, Thor., a name substituted for Acantkoctenus, 

 Keys., Thor., under wliich the single species A. variatus, Th., 

 was originally described, this species remains the type. 

 jEnigma, Karsch, has the single species, originally assigned 

 to it, ^1£. ausiraliana, Karsch, as the type. 



Part I. — (b) List of Genera and Species of the New Worldj 

 with Descrijjtions of new Species. 



Genus Ctenus, Walck., 1805. 



1805. Ctenus duhins, Wlk. ? cJ , 20 mm. Type of genus. 

 Tabl. Ar. p. 18, pi. iii. figs. 21, 22. Spec, in coll. Mus. 

 Paris. Cayenne. 



1833. Ctenus Walck enaeriijGvi&th. ?. An. King. Cuvier, 



