386 



SYNOPSIS OF TITK CYPRINIDJE OP PENNSYLVANIA. 



Hybopsis procne is very commonly sold for aquaria in Philadelphia, 

 captured as food by the wampum snake (Tropidonotus sipedon). 



T have seen it 



HYBOPSIS HUDSONIUS, Clinton. 



Amer. Lye. M. H., New York, 1824, 49, PI. TT, f. 2, Agassiz, Putnam Bulletin, Mus., 

 Comp. ZooL, Cambridge. Hudsonius fluviatilis, Girard, Proc. A. N. S., Phila., 1856, 210. 

 Eyhapsis phaenna, Cope, 1. c, 1864, 279. 



I have this species from the Delaware near Trenton. It no doubt in- 

 habits the Susquehanna, as I have procured it from the Potomac near 



Washington. 



It is in general northern in its distribution, occurring 



commonly in the waters of the great Lakes. Specimens from our regions 

 have a less obtuse and rounded muzzle than sonic from Lake Huron 

 and than Clinton's figure, but I incline to ascribe the more conic form to maturer age, as 

 it accompanies increased size. There are also slight variations in the form of the opercu- 

 lum, some having an individual feature in the greater prolongation of its anterior inferior 

 angle. A specimen from the Potomac exhibits the anomaly of the successional outer (or 

 long) scries of teeth having taken its place in advance of the shedding of the previous 

 set, hence they are 2. 4. 4 — 4. 4. 1. Those of the outer row are without masticatory sur- 

 face, those of the median as in the other species of the genus, the conic ones much trun- 

 cated. Occasionally the grinding surface is found but slightly developed. 



In this species the upper surface of the cranium is broad ; the temporal region rounded ; distance between narcs 

 about equal from anterior margin of same to end of muzzle. Bye a little less than one-third length of head ; latter 

 five and one-third times to concavity of tail, and more than equal greatest depth of body ; in storerianus the head 

 does not equal the depth, and the back is more compressed. Angle of mouth not posterior to anterior nostril. 

 Scales 5 — 88 — 4. Lateral line very slightly deflected opposite dorsal fin. Base of caudal to posterior edge of 

 dorsal equal from latter to beginning of skin of head. Hays D. 1.8 ; G. 19 ; A. 1.8, its outer border concave like 

 that of dorsal; V. 19 ; P. 15. Lateral band and beloiv silvery, a dark shade passing through former; no spot at 

 base of tail. Above pale ochre, with a fuint median line. Total length 4.75 inches; caudal fin one inch, its 

 peduncle to base of anal 1.125 inches, depth half way between anal and caudal .344. End muzzle to base dorsal 

 1.875; same to base ventral; length pectoral .72, of dorsal .875. 



A specimen from the Concstoga, half grown, exhibits some peculiarities, as a less obtuse 

 muzzle than larger specimens from Michigan, and a lateral lead-colored band two and a 

 half scales in width anteriorly. 



Yellow olive above with dorsal line and brown-edged scales, below ycllowish-whito. No distinct spot at base 

 of dorsal. Cranium and back broad. 



