172 U.S. NATIONAL MUSEUM BULLETEST 271 



should be created for these two genera which combine in a remarkable 

 way the characteristics of phliantids, oedicerotids, and eusirids. 

 This problem is also discussed under the Phliantidae (p. 405). 



Remarks on the key to genera: Differences among genera are 

 minor, for example: couplets 5, 6, 9, 16. Stebbing's (1906) key to 

 the genera utilized such quantitative features as vaulting of the 

 dorsum of the body, the dentition of the segments, and ornaments 

 of the telson, of which the present key resorts only to the latter. 

 Nevertheless, Halirages and Bouvierella are not clearly separated by 

 qualitative characters and the validity of the genera Calliopiella, 

 Atylopsis, or Amphithopsis is not convincing, the latter being related 

 closely to Halirages. 



Clarencia is not firmly assignable to the Calliopiidae because the 

 uropods and telson were missing on the unique type-specimen. 

 - Metaleptamphopus appears to be a primitive melphidippid in its 

 elongate uropod 3 and especially resembles Melphisana in the uncleft 

 telson, obsolete accessory flagellum, slightly enlarged coxae and 

 well-developed rostrum. 



Almost all of the species, except types, need refiguring of mouth- 

 parts and accessory flagella. 



Nomenclatural Changes in Calliopiidae 



Atylopsis latipalpus Walker and Scott (1903) should be removed to 

 a eusirid genus. It appears to resemble some species of Pontogeneia. 

 Pseudopontogeneia Oldevig (1959) is removed to the Eusiridae. 

 Leptamphopus litoralis Gurjanova (1938) is removed to Calliopiella. 



Key to the Genera of Calliopiidae 



(Paracalliope and Paraleptamphopus occupy freshwater and are not 



included in the key.) 



1. Gnathopod 2 chelate (fig. 736) Clarencia 



Gnathopod 2 subchelate or simple 2 



2. Articles 5-6 of gnathopod 2 together immensely elongate, slender, rectan- 



gular, sixth article 75% as long as article 2 (fig. 72/c) 3 ^ 



Either article 5 or 6 of gnathopod 2 elongate and slender, article 6 never more 



than 60% as long as article 2 22 



Neither articles 5 or 6 elongate and slender, not together greatly elongate, 



usually slightly inflated or oval 5 



3. Article 3 of mandibular palp shortened, stout, about two thirds as long as 



article 2 (fig. 71h), accessory flagellum present, lower lip with inner lobes 



Oradarea ' 



Article 3 of mandibular palp subequal to or about four fifths as long as article 



2, relatively slender, falcate or pointed terminally (fig. 71^), accessory 



flagellum absent, lower lip lacking inner lobes 4 



' See footnote 1 on p. 173. 



