130 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.9 



anal ray and ending slightly before last anal ray. Caudal base to origin of 

 second dorsal 2.6-3.02 in standard length. Anal fin elongate, its rays I, 

 26-29, its margin slightly falcate, the posterior rays 2.1-2.35 in greatest 

 height of fin. Origin of anal nearer caudal base than to tip of snout by 

 one half the length of snout. Caudal fin moderately forked, the lower lobe 

 slightly the longer. Pectoral rays 13-14, the fin broad and short, 1.4-1.53 

 in head. Ventral rays I, 5, the fin short, not reaching anal opening. The 

 closely approximated inner ray of each fin is joined by a membrane to the 

 mid-line of the abdomen. Insertion of ventrals nearer anal origin than to 

 upper angle of pectoral base. 



Color in alcohol pale yellowish. Lateral band brilliant silvery, very 

 wide, bordered above by a dark line, not or only slightly constricted on 

 caudal peduncle. Scales along mid-line of back faintly and irregularly 

 bordered with small black dots. Caudal fin margin dusky. First dorsal 

 colorless, second dorsal sometimes with a few minute, dark, irregularly 

 placed dots along the posterior edge of the anterior rays. Pectoral, ventral, 

 and anal fins colorless. A few small, scattered spots at the bases of some 

 of the anal rays. Cheeks and opercles brilliant silvery. Dorsal surface of 

 head dark posteriorly, lighter anteriorly. Lips, tip of snout, and under 

 surface of lower jaw faintly marked with small, scattered, dark brown 

 spots. 



{Nesiotes, from N?;giwT7;s, an islander.) 



History of the species. — The history of this species is discussed to- 

 gether with that of Eurystole eriarcha, above. 



Relationships. — This species differs strikingly from its two relatives, 

 nepenthe and nocturnus, in its considerably more compressed and deeper 

 form, the larger and deeper head (the muzzle being much more rounded 

 in profile), and the broader lateral band, besides the important difference 

 in the anal sheath as described in the key. These characters impress us as 

 being of subgeneric value, and we therefore propose, for this species alone, 

 the subgenus Euryarges. 



Subgenus Nectarges, sensu stricto 



Nectarges nepenthe, new species 

 Plate 19 



Eurystole eriarcha {nee Jordan and Gilbert) Jordan, 1895, p. 418, pi. 32 

 (Mazatlan; on Stanford 2689). — Jordan and Evermann, 1896- 

 1900, p. 803, fig. 339 (description and figure copied from Jordan 

 1895).— Jordan and Hubbs, 1919, p. 63, pi. 5, fig. 19 (on Stan- 

 ford 2689). 



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