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Descriptive Enumeration of a Collection of Fishes from the Western Coast of Central America, Presented to the Smithsonian Institution, by Capt. John M. Dow

Theodore Gill
1863 Proceedings of the Academy of Natural Sciences of Philadelphia  
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more » ... out Early Journal Content at JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact 162 PROCEEDINGS OF THE ACADEMY OF than one half are reported as colored, either in one or in both the companions. A catalogue of 36 stars are reported in the forthcoming number of the American Journal of Science and Art, for July, by MIARIA MITCHELL, and selected for the measurements of distances and angles of position ; 30 of these are colored in both the companions, 5 were observed in weather unfavorable for observations of color, and of the remaining one nothing is said. There is a rich mine of information in observations on the colors and on the changes of colors in the stars. Descriptive Enumeration of a collection of FISHES from the Western Coast of Central America, Presented to the Smithsonian Institution, by Capt. John X. Dow. BY THEODORE GILL. Captain Jobn M. Dow having recently forwarded a small collection of Fishes and other animals to the Smithsonian Institution, attention was arrested by the interesting nature of some of the species, and it has been deemed advisable to publish descriptions of them as well as all the other new species. Only five had been previously described; twenty-two of them are new and several represent new generic types. Many of the species are closely related to West Indian species. Family GERROIDE Bleeker. Genus DIAPTERUS Ranz., Gill. Eucinostomus Bcaird and Girard. DIAPTERUS DowII Gill. The greatest height is contained 3i times in the extreme length ; the head 41times; the diameter of the eye 21 in the head; the snout equals 4-5ths of the eye. The profile is rectilinear and the interorbital space nearly flat, but convex above the eyes, and nearly as wide as the eye.. The maxillary groove is linear and extends backwards to a vertical midways between the front of the orbit and pupil, while the scales on each side extends to the vertical from the front of the orbits. The exposed surface of the supramaxillary bones is at first triangular and thence oblong, the whole 2i times as long as wide. The height of the constricted portion of the caudal peduncle equials twothirds of its length and the diameter of the eye. The lateral line is scarcely bent behind. The second and third dorsal spines are slender, and nearly equal half the height of the body beneath; the last is little more than half as long as the first branched ray. The third anal spine is as long as the snout and longer, but more slender, than the second. The color is silvery; the spinous dorsal blackish at margin; the axilla of pectoral blackish. Three specimens were obtained along the coast. I dedicate the species to the excellent collector, Capt. Dow. Family CIHAETODONTOIDAE (Cuv.) Genus POMACANTHODES Gill. POMACANTHODES ZONIPECTuS Gill. Proc. Ac. Nat. Sci. Pa., 1862, p. 244. A single specimen in the collection, between three and four inches long, ex-[June, NATURAL SCIENCES OF PHILADELPHIA. 163 hibits a pattern of coloration analogous to that stage of the Chltodon paru called Pomacanthus quinguecinctuzs. The dorsal filament is rudimentary. Family PERCOIDA, (Cuv.) Genus CENTROPOMUS Lac. CENTROPOMUS ARMATUS Gill. The greatest height is contained 3* times in the length to the fork of the caudal fin. The head enters 2-j24 times in the same, and twice in the length to the vertical behind dorsal and anal fins. The distance from the subopercular flap to the preoperculum equals that of the latter from the hinder nostril. The diameter of the eye nearly equals a sixth of the head's length. The dorsal spines are very robust, and the second rather exceeds half the height of the body. The second anal spine is exceedingly developed, reaches to the vertical from the base of the caudal fin, and equals the interval between tbe snout and hinder preopercular spines. The first dorsal, pectoral and ventral fins when depressed terminate at nearly the same vertical, and slightly in advance of the anus. Scales 51-14 The color is yellowish-brown above, tinged with silvery beneath. The dorsal fins are more or less blackish; the soft rays yellowish. The other fins are also yellowish; the anal blackish between the second and third spines, and with the second reddish. The lateral line is brownish. A very distinct species. Compared with the species of Cuba and the West Indies, most nearly the C. en8iferus of Poey. The single specimen described is about eleven inches long.