1903.] NATURAL SCIENCES OF PHILADELPHIA. 735 



nostril circular, about last third of space between tip of upper jaw 

 and front rim of orbit. Posterior nostril slit-like and a little before 

 front rim of orbit above. Interorbital space broad, slightly convex. 

 Top of head posterior to interorbital space evenly convex. 



Gill-opening large, extending forward nearly opposite front rim of 

 pupil. Rakers long, slender, compressed, 8 + 25 on first arch, longest 

 about f of longest filaments. No pseudobranchise. Isthmus long, 

 narrow, trenchant and branchiostegal membranes not united across. 



Scales small, thin, cycloid, and rather narrowly imbricated. No 

 lateral line. Head, with exception of snout, jaws and space in front 

 of eyes, scaled. About five series of scales on cheek. Base of caudal 

 covered with small scales, none on other fins. Between bases of ven- 

 trals several small scales, and each fin with a small axillary scale. No 

 pectoral flap. 



Spinous dorsal a little posterior, its origin a little nearer base of 

 caudal than tip of upper jaw, weak, depressable in a groove, and reach- 

 ing I of distance to soft dorsal. Soft dorsal with anterior rays ele- 

 vated and inserted about midway between base of caudal and origin 

 of ventral or over middle of base of anal. Anal inserted posterior to 

 tip of depressed spinous dorsal, and anterior rays longest. Caudal 

 moderately large, forked, and lobes rounded. Pectoral small, high, 

 and reaching about f of distance to origin of ventral. Ventral small, 

 inserted nearer origin of anal than origin of pectoral, and reaching 

 hardly half-way to anus. Anus as far from tip of ventral as length of 

 that fin or just before origin of anal. 



Color in alcohol pale brown below, darker above, and each series 

 of scales longitudinally with a narrow dark band. A broad brassy 

 l)and, as wide as pupil, more or less olivaceous along its upper margin, 

 extending from pectoral to base of caudal. A pale median olivaceous 

 streak from occiput to first dorsal, and continued posteriorly to base 

 of caudal. Lower surface of head brassy. Fins more or less uniform 

 ])ale brown. Peritoneum black. 



Length 8^ inches. 



One example, identified as Atherina latidavia by Cope. Callao Bay. 

 Peru. Prof. James Orton. Presented by Prof. E. D. Cope. Dr. 

 Smitt has recently figured an example identified as Atherinichthys regia 

 var. latidavia.^ However, it shows about 70 scales in a lateral count 

 to base of caudal. Basilichthys microlepidotus is also united with 

 regia. 



■' Bih. Kon. Sven. Vet.-Ak. Hand. Stockholm, XXIV, iv., 1899, p. 31, PI. 4, fig. 30. 



