24 



BULLETIN 18 0, UNITED STATES NATIONAL MUSEUM 



occurrence of two pairs of nasal openings over the eyes. Herre * 

 made the same mistake in connection with Anurchias reticulatus 

 Herre. 



Scuticaria *^ also is not a valid genus, as the young and half -grown 

 of tigrmus lack tubular posterior nostrils, the character on which 

 the genus was based. 



Some of the species that I have referred to the genus Uropterygius 

 have not been adequately compared by authors because of the lack 

 of material in various museums, and a few species have been com- 

 bined with others on grounds that seem unjustified from the material 

 at hand. The following key will be useful in comparing my ma- 

 terial with that in other museums. Tlie plates in Bleeker's Atlas 

 are good representations of several of my species as indicated in the 

 key. See also table 3. 



Table 3. — Measurements {in millimeters) of specimens referred to species of 

 Uropterygius from the Phoenix and Samoan Islands 



Character 



allardicei 



leucurus 



polyspilus 



ti- 

 grinus 



fiji- 

 ensis 



Total length 



Snout to anus 



Head _ 



Snout -. 



Greatest depth 



Diameter of eye. 



Length of mouth 



Length of longest midcaudal 

 fin rays.. 



158 



77 



22 

 3.3 

 7.8 

 2.2 

 7.2 



LI 



102 



50.5 



12 

 1.9 

 4.5 

 1.2 

 5 



0.7 



166 



81 



22.2 

 3.8 

 8.2 

 2.0 



155 



75 



21 

 3.5 

 8.0 

 1.8 

 7.2 



1.5 



128 

 57 

 18 



3.2 



7 



1.6 



5.7 



L3 



103 

 48 

 15.2 

 2.7 

 5.7 

 1.4 

 4.4 



1.0 



130 



57 



17.8 

 2.8 

 5.6 

 1.8 

 5.9 



1.3 



197 



88 



21 

 4 



7.8 

 2.0 

 8.1 



115 

 49.4 

 12.2 

 2.3 

 4.2 

 1.6 

 5.2 



0.9 



180 



83.5 



17 

 3 



8.7 

 1.6 

 5.8 



1.0 



148 

 75 

 13 

 2.5 

 5.5 

 1.2 

 3.3 



0.5 



815 

 525 

 69 

 9 

 31 

 5.3 

 19 



2.0 



605 

 315 

 60 



8 

 30 



3.5 

 17 



3.0 



Character 



xanthopierus 



con- 

 color 



micTopterus 



Total length 



Snout to anus 



Head 



Snout 



Greatest depth 



Diameter of eye 



Length of mouth 



Length of longest midcaudal 

 fin rays .. 



160 



62 



16.5 

 3 



5.3 

 1.6 

 6.2 



225 

 91 



21.5 

 3.7 



8.4 



2 



8.4 



2.4 



295 

 116 

 27.3 

 5 



12 

 2.3 



3.9 



100 

 39 



9.7 



1.9 

 3.7 



1 



3.5 



150 

 67 

 17.4 

 2.5 

 6.5 

 1.5 

 6 



0.5 



240 

 110 

 28 

 4.5 

 13.5 

 2.1 

 9.4 



1.7 



175 

 80 

 18.5 

 3 



8.6 

 1.5 

 6.5 



1.4 



125 

 57 

 16.7 

 3 



6.5 

 1.2 

 5.5 



0.6 



160 

 73 

 23 

 4.1 



205 



98 



27 

 5 



11 

 2.2 

 9.5 



1 



355 

 155 

 33 

 6.2 

 15.5 

 2.6 

 12.4 



(') 



515 

 215 

 51 

 7 

 24 

 3.0 

 16 



(•) 



77 

 22 



4.2 



9 



1.6 



1 Completely covered with skin. 



KEY TO THE SPECIES OF UROPTERYGIUS FROM THE PHOENIX AND SAMOAN 

 ISLANDS AND OTHER CLOSELY RELATED SPECIES FROM THE SOUTH PACIFIC 



la. Posterior nostril not a single opening but divided into two parts, tliese two 

 openings separated by only a septum or by considerable space (occur- 

 rence of septum is most constant and iwsition of extra pore in reference 

 to the p<Jsterior nasal opening is also almost invariable). 



* Philippine Journ. Sci., voL 23, p. 230, pi. 9, fig. 3, 1923. 



*•' Scuticaria .Tordan and Snyder, Proc. U. S. Nat. Mus., vol. 23. p. 886, 1901. 

 Ichthyophis tUjrinus Lesson.) 



(Type, 



