118 PROCEEDINGS OP THE ACADEMY OF 



8, 7, 1, 4 ; V 6 ; P 15 The scales are somewhat deeper than long, anteriorly 

 truncated and posteriorly rounded, whilst the upper and lower margins are 

 nearly straight and parallel. The concentric lines of growth are very fine and 

 numerous, and short radiating farrows occupy almost the entire anterior mar- 

 gin. 



The dorsal region and tipper surface of the head are greyish olive or oliva- 

 ceous brown, with a darker line at the periphery of the scales. The flanks are 

 fasciated alternatively with greyish brown and light yellowish transverse nar- 

 row bands, the more conspicuous as they approach the peduncle of the tail ; 

 the brown *bands being wider than the light yellowish ones ; there are how- 

 ever instances in which light streaks subdivide the brown bands. The oper- 

 cular apparatus is silvery : the lower part of the bead and the belly exhibit- 

 ing a uniform light olivaceous or yellowish tint. 



The name of Adinia multifasciata appears to us quite characteristic of the 

 species which is here described. An immature female specimen is figured on 

 Plate xxxviii, figs. 12-14 of the "Ichthyology of the U. S. and Mexican Boun- 

 dary," where it is given as the female sex of Limia pceciloides, an error which 

 we now rectify. 



XLIX. Another new genus, which we call Lucania, has the general appear- 

 ance of Fundulus, from which it differs by the presence, upon the jaws, of one 

 row of teeth only ; the mouth itself being fashioned as in Fundulus : the up- 

 per jaw being smaller and somewhat shorter than the upper, arched sideways 

 and subdepressed superiorly. The head is somewhat rounded off and blunt. 

 The insertion of the anal fin is more posteriorly than the dorsal. The caudal 

 is rounded off. The scales are of but moderate development, deeper than long, 

 with fine concentric strife, and furrowed upon their anterior section. The sexes 

 afford no greater differences than in Fundulus and Hydrargyra. 



The typical species of the genus which is here instituted, was figured and 

 described by us under the name of Limia venusta in the "Ichthyology of the 

 U. S. and Mexican Boundary," plate xxxix, figs. 20 23, p. 71. Its present 

 systematic name, therefore, will be Lucania venusta. Fig. 21 gives a most 

 perfect idea of the shape and structure of the mouth. The lateral line is not 

 always so conspicuous as represented in fig. 20. The teeth themselves are 

 proportionally larger than in the following species. The anterior margin of 

 the dorsal fin is nearly equidistant between the apex of the snout and the in- 

 sertion of the caudal. The anal is placed opposite the posterior half of the 

 dorsal, and consequently projects further back. The ventrals are slender, 

 extending as far as the vent, and composed of six rays and not five, as formerly 

 stated. The pectorals are elongated, posteriorly rounded off, and projecting 

 beyond the insertion of the ventrals. The rays are : D 13 ; A 11 ; C 3, 1, 8, 8, 

 1, 2 ; V 6 ; P 10. The scales are deeper than long, anteriorly subtruncated, 

 rounded off upon the remaining edges, with radiating furrows upon the anterior 

 section only, the concentric lines of growth being very fine. The ground color 

 is reddish brown, with groups of dark dots on the centre of the scales ; the 

 fins being unicolor, of a yellowish olive tint. A specimen of this species was 

 collected at Indianola, Tex., by John H. Clark, under Col. J. D. Graham, while 

 on the U. S. and Mexiean Boundary Survey. 



L. We find in the collection of the late L. Berlandier two specimens of a 

 species of Lucania, collected in the neighborhood of Matamoras, resembling 

 very closely the preceding one. The only differences which we are able to 

 detect consist in a larger mouth and larger scales, a more backward position 

 of the dorsal and anal, together with the following formula of the fins : D 12 ; 

 A 11 ; C 4, 1, 7, 7, 1, 3 ; V 6 ; P 12. The coloration is the same. The speci- 

 mens not being perfect, a further comparison could not be instituted. We shall 

 designate them provisionally under the name of Lucania affiiiis. 



LI. Amongst the fishes collected in the vicinity of the city of Mexico, by Maj. 



[April, 



