SPHYRAENA 



N = 68 



SILUS 



N = 34 



■— t— > 



SIALIS 



N = 45 



ALICEAE 



ELONGATA 



AU5TRALIAE 



KAGOSHIMAE 



N=15 



N=10 



N«n 



r-M 



N = 50 



 H 



rti 



I , I I 



EUCHUS 



N=16 



r-H 



STRIATA 



GEORGEI 



N = 53 



N-35 



J±l. 



J±L 



BRUCEI 



STEWA8T1 



N = 69 



N=18 



r— h-i 



XtL 



13 14 15 16 17 18 19 20 21 22 23 24 



MAXILLARY LENGTH AS PERCENT OF HEAD LENGTH 



25 



26 



27 



28 



FiouBE 2. — Two species groups of Argentina as shown by maxillary length as percent of head length. Horizontal lines are 

 ranges ; bars are two standard errors on each side of means ; vertical lines are means. 



georgei and bnu;ei have been taken together off 

 Honduras {Oregon 3626) and at closely adjacent 

 localities at similar depths off the south coast of 

 Jamaica [Oregon 3549 and 3548). A. georgei and 

 stewarti were caught in the same trawl off the 

 Virgin Islands {Orego-n sta. 2606). A. striata and 

 georgei were caught at approximate, localities and 

 depths off' the east coast of Florida, south of Dry 

 Tortugas, and on the north coast of Cuba. 



Figure 3 shows the distribution and figure 4 

 sununarizes the co-occurrence of the four species. 

 A. hrucei and georgei each live with three other 

 western Atlantic species; .striata and stewarti each 

 with two others. Only A. striata and stewarti are 

 not so far known to co-occur. 



We treat the four tropical western Atlantic 

 forms as full species because they are sympatric, 

 even though the magnitude of differences between 



them is less than the magnitude of differences 

 separating species of the situs group. Although the 

 western Pacific forms are not known to be sjTn- 

 patric, we recognize them also as full species. It is 

 obvious that in the genus Argentina, characters of 

 the magnitude of those separating elongata, 

 austraiia-e, and kagoshiniae can signal the existence 

 of full species. 



SWIMBLADDER 



The occurrence of silver}^ pigment in the outer 

 layers of the SAvimbladded of some species of 

 Argentina has l>een noted many times in the litera- 

 ture. Cohen (1958) added the observation that 

 some species of Argentina lack this silvery pig- 

 ment. He commented that presence or absence of 

 silvery pigment did not seem to be a function of 

 age, size, time of year, or method of preservation, 



ADDITIONS TO A REVISION OF AEGENTININE FISHES 



15 



379-242 O - 70 - 



