68 PROCEEDINGS OF THE ACADEMY OP 



anal. The caudal is emarginated posteriorly. The species itself being yet un- 

 described, we shall call it Alvordius ?naculatus. The specimens before us mea- 

 sure two inches and three quarters. The body is elongated, rather slender and 

 subfusiform. The head is subcorneal, entering about four times and a half in 

 the total length. The eye is well developed ; its diameter being contained 

 four times in the length of the side of the head ; once in advance of its anterior 

 rim. The posterior extremity of the maxillar bone extends to a vertical line 

 drawn within the anterior rim of the orbit, not quite in front of the pupil. The 

 lower jaw is somewhat shorter than the upper. The first dorsal fin is much 

 longer and lower than the second, to which it is nearly contiguous. Its upper 

 margin is convex. The second dorsal is longer than high, diminishing gradu- 

 ally backwards. The caudal, which forms about the sixth of the total length, 

 is somewhat emarginated posteriorly. The anal is placed opposite the second 

 dorsal, and nearly equal to it in size and shape. The ventrals are sublanceo- 

 lated and rather short ; their posterior extremities being even with those of 

 the pectorals, which are subelliptical in their outline. The formula of the fins, 

 reads . D xiv ; 13 ; A i, 10 ; C 5, 1, 7, 6, 1, 8 ; V i, 5 ; P 14. The scales are 

 rather small, deeper than long, anteriorly subtruncated, posteriorly rounded, 

 with radiating furrows upon the anterior section only, and fine pectination upon 

 the posterior margin. A series of larger scales conspicuously toothed pos- 

 teriorly, may be observed along the ventral line between the vent and the 

 extremities of the ventrals. The ground color is reddish brown, the dorsal 

 region being tessellated with blackish spots, whilst a series of black patches 

 may be observed on either side, larger and less numerous in the male than 

 in the female. A black streak intersects vertically the eye. The fins in 

 the male are unicolor, except the first dorsal, which is black, spotted at the 

 base. In the female sex, the caudal exhibits transverse blackish lines. The 

 inferior regions are unicolor in either sex. 



XXVII. In 1S52, E. O. Dayton, Esq., sent to the Smithsonian Institution, 

 amongst other fishes, a species of Etheostomid, which we referred at that time 

 to an undescribed genus. Subsequently, the genus Catonotus was published, 

 answering to it. The species being still unknown, we propose to call it C. 

 fasciatus. The specimens are a little short of three inches, the head entering 

 about four times and a half in the total length. The gape of the mouth is 

 oblique, the posterior extremity of the maxillar bone reaching a vertical line 

 drawn immediately in front of the pupil. The diameter of the eye enters five 

 times in the length of the side of the head. The first dorsal is very low and 

 equal in length to the second, which is superiorly convex, and as high posteri- 

 orly as anteriorly, the tip of the posterior rays extending almost to the in- 

 sertion of the caudal. The anal fin is much smaller than the second dorsal, 

 and longer than deep. The caudal is rounded off. The ventrals are rather 

 small and subovate, whilst the pectorals are subelliptical, and extend further 

 back than the ventrals, either of which being very far from attaining the vent. 

 The formula of the fins is : D vm ; 15 ; A n, 8 ; C 4, 1, 7, 6, 1, 4 ; V 1, 5 ; 

 P 13. The scales are small, subcircular, rather deeper than long, minutely 

 and inconspicuously pectinated upon their posterior margin, with radiating 

 furrows upon their anterior section alone. The lateral, which is nearer the 

 back than the belly becomes obsolete from the origin of the second dorsal back- 

 wards. The ground color is chestnut brown, with irregular blackish fascia? 

 across the dorsal region and upper portion of the flanks ; the inferior regions are 

 of a lighter tint than the back, and unicolor. The second dorsal and the caudal 

 are transversally barred with black upon a yellowish ground. The other fins 

 are uniform whitish yellow, except the first dorsal which is greyish. A vertical 

 black streak may be seen beneath the orbit. 



[Feb. 



