NATURAL SCIENCES OP PHILADELPHIA. 279 



Hybopsis storerianus*. No. 329, Flint River at Flushing, Genesee Co. 

 Hybopsis h u d s o n i u s, Agass. No. 531. Lake. 

 Hypsilepis d i p 1 se m i a.' Specimens from near Lansing. 



Hypsilepis frontalis!, Agass. 



Numerous specimens from Grosse Isle, Detroit River, Three Mile Lake and 

 Waterford, Oakland Co.; Swartz Creek, Genesee Co. and Monroe Co. 



Specimens from the last locality, seven in number, represent a strongly- 

 marked variety, characterized by the great elevation of the outline in front 

 of the dorsal fin, and other points. From the first dorsal ray, the outline 

 again descends, giving the fin a very oblique position : this extends also, 

 when laid back, as far as above the fifth anal ray, while in frontalis it 

 most usually reaches a point opposite the first ray only. The eye is contained- 

 four times in the length of the head more frequently four and a half times 

 in f r o nt al i s. The length of the head measures in the depth of the body, 

 from the dorsal outline to the middle of the row below that bearing the 

 lateral line ; it extends nearly to the ventral outline in frontalis. The 

 pharyngeal bones appear to be relatively rather stouter than in typical 

 frontalis, and are not furnished with so prominent an inferior angle to 

 the external ala. This, with the form of the body, would almost indicate a 

 species ; but as I find approximations in these and transitions in the other 

 characters, I cannot so consider it. In H. frontalis the number of scales 

 traversed by the lateral line varies from 38 to 43. 



Hypsilepis cornutus Bd. 



Specimens from Pine Lake, Emmet County, Bruce, Macomb County, and 

 one from Swartz crek, agree with the many Susquehanna specimens in my 

 possession in a more elongate form of head and body than specimens from 

 tributaries of the Delaware. They often differ from those of the Susquehanna 

 in having a row of scales or two more below the lateral line. In Delaware 

 specimens the head is shorter than in the latter, not more so than in the for- 

 mer, but the depth of the body is greater than in either, entering in length 

 to base of tail 3i times in the others 4 and 4^ times. The dorsal fin is a 



behind ventrals, like the anal slightly concave on the border. Caudal not deeply forked. Kays, 

 D.I 8; C. 19; A. 1 7; V. 7 ; P. 13. Twenty-five rows of scales trim dorsal to ventral. Largest, 

 specimen nearly 3 inches. Silvery. Pale cinnamon above ; a dark lateial shade; yellowish below. 

 A dark spot at base of caudal. 



Hybopsis phaenna is a species found in some of the tributaries of the Delaware, which I 

 have received from Trenton, N. J., from my friend Charles C. Abbott. It is more elongate in form 

 than H. hudsonius and storerianus, and has not the rounded front of the first or the small, 

 compressed head of the last. Eye a little less than one-third length of head ; latter 5% times to 

 concavity of tail, and more than equal greatest depth of body ; in s t o r e r i a n u s the head does 

 not equal the depth, and the back is nure compressed Angle of mouth not posterior to anterior 

 nostril. Scales ^38. Lateral Hue very slightly deflected opposite dorsal fin. Base of caudal to 

 posterior edge of dorsal equal from latter to beginning of skin of head. Rays D. l - 8; C. 19; A. 

 1-8, its outer border concave like that of dorsal ; V. 19 ; P. 15. Length 4 inches. 



Lateral band and below silvery, a dark shade passing through former; no spot at base of tail. 

 Above pale ochre, with a faint median line. 



The operculum of this fish is narrower than that of the hudsonius, rather than broader as 

 in amarus, and the head is longer than in the latter. In stOTerianus the mouth is smaller, 

 and the operculum broader, and with a prominent superior angle. The gracilis is said to have 

 the pectorals reaching the ventrals, which I have not seen in any of the species at my disposal. 



f Cyprinella, distinguished from Hypsilepis by its crenate teeth, must receive the Leuciscus k e n- 

 tuckiensisof Dr. Kirtland. It is abundant in the tributaries of the Ohio, where it represent* 

 the nearly allied C. analo s tana, Gird., of the Susquhanna and Delaware. The differences be- 

 tween these species are as follow : 



analostana. 



Head Z% to 4 times in length to base of tail. 



5-(6) 

 Scales 325. 



-(3) I 3-4 



1864.] 



kentuckiensis. 



Head 4% times ; muzzle more acute, 

 b 7 

 Scales 3840. 



