Cope.] 462 (June 7, 
48. HyBopsis cHILITICUS, Cope. 
Spec. nov. 
This species is an ally of the last ; it has a more clupeoid aspect, seen in 
strongly decurved lateral line and more acuminate muzzle. Head broad 
behind occiput, convex, interorbital width less than length of muzzle, orbit 
3 times in head, exceeding length of muzzle; maxillary extending beyond 
its anterior rim. Teeth 4.2—2.4. Dorsal small, originating above vent- 
rals, R. I. 8, A. I. 8. Line of premaxillary margin opposite middle of 
pupil. 
Length 24.4 lines ; to basis dorsal 12.41; to basis caudal 24.4 1. Length 
pectoral from base 5; from same base to do. ventrals 5.7 lines. 
In life pure silver white to the dorsal line; the dorsal scales brown 
edged ; a vermilion band through anal fin and one through dorsal ; the 
lips vermilion all round the mouth. 
This species is as beautiful as the H. chlorocephalus ; if not as rich, its 
tints are much more transparent. Common in the tributaries of the Yad- 
kin River, in Roane County, North Carolina. 
HEMITREMIA, Cope. 
Genus novum. 
Char. Dentition 5-5, with marked masticatory surface. Alimentary 
canal short, with the usual two flexures. The lateral line one-half want- 
ing, and generally imperfect. First (osseous) dorsal ray adherent. Pre- 
maxillary projectile. 
This genus is Hybopsis with teeth 5—4, and undeveloped lateral line. 
Perhaps it will be necessary in future to refer H. heterodon and H. 
bifrenatus to it. 
Hemitremia vittata, Cope. 
This is a stout species with very short head and obtuse muzzle. The 
latter is rounded horizontally from the orbits. The mouth is short and 
oblique ; the end of the maxillary does not reach the orbit. Diameter of 
orbit equal muzzle, 8.5 in head ; 1.33 times in interorbital width. Length 
head 4.2 times to base caudal; depth 4.5 in same isthmus rather wider. 
The first dorsal ray originates a little behind above the ventrals; scales 
6 : 
38: Radii D. I. 8; A. E. 7. Length to basis caudal 24.4 lines. Do. to 
4 
basis dorsal 13.2 lines ; length pectoral 4.2. 
The specimen is alcoholic, and I do not know the colors in life. There 
is a conspicuous dark shade along the median lateral line, and a pale band 
above it; above this the whole dorsal region is of a dark color. 
This species is from the tributaries of the Holston River, near Knox- 
ville, Tennessee, and was procured by my friend, Prof. Harrison Allen, 
who submitted the specimen to me for examination. 
PHOTOGENIS, Cope. 
Proceed. Acad. Nat. Sci., 1867, 163. 
