6b. Pectoral fin rays 15 or more 7. 



7a. Ventral fin rays 10-12 8. 



7b. Ventral fin rays 12-15, usually 13 or more.. 9. 



8a. Lateral line scale rows 54 (51-54) ; ventral fin rays 1 1-12, usually 12 ; anal fin rays 



11-13, usually 12 or fewer; vertebrae 50-51 A. kagoshimae. 



8b. Lateral line scale rows 49 (47-50); ventral fin rays 10-11, usually 10; anal fin rays 



13 or more; vertebrae 47-48 A. euchus p. 33. 



9a. Gill rakers on lower arm of first arch usually 7 ; vertebrae 45 (44-46) A. brucei p. 31. 



9b. Gill rakers on lower arm of first arch usually 6 ; vertebrae 47-54 10. 



10a. Swimbladder usually with definite silvery pigment or iridescence; pectoral fin 

 rays 19 (18-21); body depth in standard length 8.2 (6.4-10.3); caudal peduncle 



depth in head length 5.2 (4.4-6.0); vertebrae 49 (47-51) A. striata p. 22. 



10b. Swimbladder lacking silvery pigment, sometimes U'idescent; pectoral fin rays 17 

 (16-19); body depth in standard length 9.5 (7.4-12.0); caudal peduncle depth 



in head length 6.4 (5.6-7.3) ; vertebrae 48 (47-50) A. georgei p. 27. 



10c. Swimbladder lacking silvery pigment, sometimes iridescent; pectoral fin rays 20 

 (19-21); body depth in standard length 11.8 (9.1-13.6); caudal peduncle 

 length in head length 6.0 (5.5-7.1); vertebrae 52-53 A. stewartip.29. 



ARGENTINA ALICEAE, NEW SPECIES Counts 



Figures 2, 6 See tables 1 to 7. 



Measurements 

 Diagnosis g^^g^^j ^^ ^^^^ ^qq specimens, 83.2 to 143 mm. 



This species can be separated from ^. s;;%raewz standard length, given as percent of standard 



and sj?us by its smooth instead of spiny scales and length. Predorsal 48.6 (46.0-50.6); head length 



by its five instead of six branchiostegals. J.. afo"ceae 33.7 (32.3-36.7); snout 10.5 (9.7-11.6); eye 8.7 



differs from sialis in having a longer head, 33.7 (7.9-9.5) ; maxillary length 7.8 (7.0-9.1) ; depth 



(32.3-36.7) percent of standard length, in sialis a^t dorsal fin 17.3 (15.1-20.0) ; depth caudal pe- 



28.8 (27.3-31.2); a larger eye, 8.7 (7.9-9.5), in duncle 7.5 (6.9-8.7). 



sialis 7.0 (6.1-7.9) ; fewer vertebrae, 44 (43-45), in Description 



si<ilis 48 (47-50) ; and fewer lateral line scales, 47 Greatest depth at dorsal origin, tapering to 



(45^8), m sialis 49 (48-51). It differs from all caudal peduncle. Body in cross section deeper than 



other species of ^7Ve?ii!^w^ in having 16 to 21 gill wide; belly rounded. The head, when viewed 



rakers on the lower ai-m of the first arch rather laterally, has its dorsal profile slightly broken by 



than 5 to 10. the margin of the eye ; the ventral profile rises to 



Figure &.— Argentina aliceae, USNM 202462, holotype, 147 mm. standard length. All scales not shown. Cross section from 



in front of dorsal fin. Drawn by Mildred H. Oarrington. 



ADDITIONS TO A REVISION OF ARGENTININB FISHES 



19 



