22 U.S. NATIONAL MUSEUM BULLETIN 260 



extremely broad in relation to body ; ooxae 1-4 enlarged, similar in size 

 to each other, subquadrate; mandibles enormous,* laclnia mohllis of 

 one side very large,* of other side small,* molar large,* weakly tritura- 

 tive, nearly smooth, palp 3-articulate, borne directly on mandibular 

 body, article 3 slender ; lower lip with enlarged inner lobes* nearly ob- 

 scuring tips of outer lobes, mandibular processes well developed and 

 blunt; palp of maxilla 1 biarticulate; article 2 of maxillipedal palp 

 much wider than base of article 3, latter article slightly produced api- 

 cally, article 4 long, finger-like, bearing two long apical setae ; antenna 1 

 not geniculate, antenna 2 with only two flagellar articles ; gnathopods 

 similar to each other, small, subchelate, fifth articles longer than sixth 

 and slightly lobate posteriorly; pereopods bearing seventh articles, 

 pereopods 1 and 2 similar to each other; pereopod 3 with expanded 

 second article* and pereopod 4 with slightly to strongly expanded arti- 

 cles 4 and 5 ; pereopod 5 slightly shorter and of somewhat different 

 structure than pereopod 4; article 5 very broadly lamelliform and 

 forming ventrally extended lobe; inner ramus of uropod 3 scale-like, 

 or spinif orm, less than half as long as outer ramus ; telson deeply cleft. 



Remarks. — The following new species of Urothoides so strikingly 

 conforms to the type-species Urothoe lachneessa Stebbing (1888) and 

 so little to the only other described species of Urothoides that the diag- 

 nosis of Urothoides is slightly emended and Urothoides oniscoides 

 K. H. Barnard (1932) is removed to Urothoe Dana provisionally. 

 Thus, Urothoides differs from Urothoe especially in the enlarged 

 rostrum and the phoxocephalid-like pereopod 5, with ventrally ex- 

 tended lamelliform article 2. 



By defuiition this genus belongs with the Phoxocephalidae but it is 

 assigned to the Haustoriidae because it has many characters of that 

 family, bears close relationship to Garangolla J. L. Barnard (1961) 

 and differs in its external appearance from any other phoxocephalid. 

 Indeed, it is a short, squat-bodied genus, having considerable setation 

 of the body segments, whereas phoxocephalids (except some species 

 of Paraphoxus) have slender bodies and a slick and shiny chitin usu- 

 ally devoid of dorsal setae. The presence of a well-developed rostrum 

 and the differences in proportions and structure of pereopods 4 and 5 

 are characters of phoxocephalids. Such genera as Zohracho J. L. 

 Barnard (1961) and Urothoides demonstrate Vao, difficulty of distin- 

 guishing Phoxocephalidae and Haustoriidae ; further evidence of this 

 difficulty is the fact that several genera have been assigned alterna- 

 tively to either family. The enormous mandibles and their molars 

 and the shape of article 2 of the maxillipedal palp also are characters 

 not generally attributed to phoxocephalids. The rostrum of most 



*See figures 8-10. 



