Jordan and Evermann. Fishes of North America. 803 



in Menidia, but the jaws are shorter and the opercles are truncated behind. 

 One species known. (ei>pi>f> broad; aroXfi, stole, the silvery band being 

 very wide.) 



1173. EUBTSTOLE ERIARCHA (Jordan & Gilbert). 



Head 5 ; depth 5; snout short, 3| in head; eye large, 2f in head. Dor- 

 sal IV-1, 11 or 12 ; anal I, 27; scales about 48-9.* Body short, deep, much 

 compressed ; head short, deep, about i longer than deep, rather broad 

 above; opercles truncate behind, the interorbital space about equal to 

 eye. Mouth very small, terminal, very oblique, with curved cleft as in 

 Menidia, the premaxillary very short, wide behind, with curved edge, 

 slipping under the narrower maxillary ; the premaxillary protractile but 

 not much movable; jaws subequal, the lower slightly included. Maxil- 

 lary scarcely as long as eye, not quite reaching front of eye. Teeth rather 

 large, hooked backward. Gill rakers numerous, long and slender. Scales 

 smooth, caducous, not easily counted, 21 before dorsal. Pectoral moder- 

 ate, not falcate, inserted high, 1^ in head, 6 in body, reaching to the mid- 

 dle of the small ventral. Belly not especially compressed ; not cultrate. 

 First dorsal very small, slightly nearer snout than base of tail, over first 

 ray of anal; last ray of dorsal much before last of anal. Anal very long, 

 somewhat elevated in front, its base 3 in body. Soft dorsal and anal 

 scaleless. Color translucent green, very pale; back, lips, and base of ver- 

 tical fins faintly dotted; lateral band very broad and highly silvery, 

 f as broad as eye; lower fins pale ; air bladder not visible through the 

 flesh. Length 2f inches; two specimens known, both from Mazatlan, 

 the above description from the second example. (pi-, an intensive par- 

 ticle; apxbf, anus, from the long anal fin.) 



Atherinellaeriarcha, JORDAN & GILBERT, Proc. U. S. Nat. Mus., 1881, 348, Mazatlan. (Type, No. 

 29243. Coll. Gilbert.) 



359. THYRINA, Jordan & Culver. 



Thyrina, JORDAN & CULVER, Report Fishes Siualoa, MS., 1895, (evermanni). 



This genus differs from Atherinella chiefly in possessing perfectly smooth 

 scales. The translucent air bladder shows through the skin ; the pec- 

 toral is falcate, longer than head ; anal very long, the small first dorsal 

 inserted behind its front ; belly compressed to a bluntish edge. Some 

 of these characters have not been verified in pachylepis and guatemalensis, 

 which may belong here rather than in Menidia. Two species known. 

 (Ovpig, a window ; from the translucent air bladder, which shows through 

 the skin.) 



a. Anal rays about 1,24, the base of the fin 2^ in body; pectoral 3% in body, its posterior 



margin concave; ventrals pale. BVERMANNI, 1174. 



aa. Anal rays 1,21, the base of the fin 3 in body; pectoral 4% in body, its posterior margin 



scarcely concave; ventrals black. CRYSTALMNA, 1175. 



*Not to be exactly counted ; the number (36-7) stated in our original description was an error. 

 The scales can not be accurately counted, but there are over 40 at least. 



