Jordan and Evermann. — Fishes of North Afnertca. 713 



1056. TYLOSUBUS ARDEOLA (Cuvier & Valenciennes). 



D. 13 ; A. 18. Caudal peduncle depressed and with a sharp keel ; scales 

 and bones green; eye moderate; top of head striated ; teeth very small; 

 base of upper jaw much de'preseed ; maxillary entirely hidden; caudal fin 

 forked; ventral midway between eye and caudal. West Indies. (Giinther, 

 as " Belone depressa"); not seen by us. The synonymy below is all more 

 or less doubtful. (Jrdcola, diminutive of Ardea, heron.) 

 f Belone ardeola, Cuvier & Valenciennes, Hist. Nat. Poiss., xviii, 425, 1846, Martinique. 

 f Belone cigoneUa, Cvvit.n & Valenciennes, Hist. Nat. Poiss., xviii, 430, 184G, Porto Rico. 

 f Belone argidn.i, Le Sueuk MS. in Cuvier & Valenciennes, Hist. IJat. Poiss., xvin, 439, 1846, 



Guadeloupe. 

 Belone clepressa, GI'ntiier, Gat., vi, 235, 1866; not of PoEV. 



1067. TYLOSURUS STOLZMANNI iStcindachner). 



(SlERRITA.) 



Head 2f ; depth nearly 18 ; eye large, about 10^ in head or about 3 in 

 postorbital part. D. I, 16; A. I, 17; P. 13; scales about 250. Body very 

 slender, not compressed; caudal peduncle depressed, half wider than 

 deep, the lateral line forming a moderate keel, which is green. Jaws 

 very long, slender, and fragile, the tip of the lower projecting; length of 

 upper jaw from eye 2| times length of postorbital part of head, or 9 times 

 space between nostrils; maxillary scarcely reaching vertical from front 

 of pupil, about half of its posterior portion slipping under the preor- 

 bital, which is small, not reaching backward to tip of maxillary. Scales 

 larger than in T. exili.s. luterorbital region with a rather broad and deep 

 scaly groove, widest anteriorly and extending backward to opposite mid- 

 dle of cheeks ; behind this the middle part of cranium somewhat elevated 

 and bounded by two longitudinal ridges higher than the temporal ones; 

 this region scaleless. Cheeks well scaled ; scales on opercle very minute. 

 Dorsal origin above base of fifth anal ray ; anterior rays of both fins 

 producecl; other rays equal, the posterior not reaching nearly to base of 

 caudal; anal lobe higher than dorsal lobe, its length 4 postorbital part 

 of head; ventrals small, extending about h distance to origin of anal, 

 their insertion midway between base of middle caudal rays and middle 

 of cheek ; pectorals broad, as long as postorbital part of head, the upper 

 ray broad; caudal lunate, lower lobe longer. Color green above, white 

 below ; a dusky dorsal stripe and a silvery lateral one ; sides of head sil- 

 very, upper part of cheek puuctulate, a blackish half bar between cheek 

 and opercle ; a blackish blotch above eye and one in front of nostrils ; fins 

 olivaceous, somewhat dusky at tip ; posterior part of pectoral more or less 

 abruptly black, sometimes merely dusky ; caudal keel green.* Length 2 

 feet. Abundant at Mazatlau, where it is a common market fish; also 

 taken at Guaymas by Evermann and Jenkins; south to Peru. 



Belone slohmauni, Steindachneu, Iclith. Beitr., vii, 21, 1878, Tumbez, Peru. 

 Tylosnntfs sien-ila, Jordan & Gilhert, Proc. U. S. Nat. Mus., 1881, 458, Mazatlan. (Type, Nos. 

 28102, 28265, 29227, 29377, and 29378. Coll. Gilbert.) 



* This description is drawn up from Mazatlan specimens, including the types of T. sierrila. 

 Steindachner's types of B. stolzmannt are described as having a smaller eye (U in head instead of 

 10^), the pectorals merely dusky, and D. 15; A. 16. 



