[Cope. -aiw^ [June?, 



48. Hybobsis chiliticus, Cope. 



Spec. nov. 



This species is an ally of the last ; it has a more clupeoid aspect, seen in 

 strongly deciirved 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. 1. 8, A. 1. 8. Line of premaxillary margin opposite middle of 

 jjiipil. 



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 broM'n 

 edged ; a vermillion band through anal fin and one through dorsal ; the 

 lips vermillion 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 Rivei', in Roane County, North Carolnia. 



HEMITREMIA, Cope. 



Genus novum. 



Char. Dentition 5 — 4, 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. 



Ilemitremia vittatM, Cope. 



This is a stout species with very short head and obtuse muzzle. The 

 latter is rounded horizontally from the orbits. The moiith is short and 

 oblique ; the end of the maxillary does not reach the orbit. Diameter of 

 orbit equal muzzle, 3.5 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 



3«1 Radii D. 1. 8 ; A. E. 7. Length to basis caudal 24.4 lines. Do to 



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 aloiig 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 sijecimen to me for examination. 



PHOTOGEMIS, Cope. 

 Proceed. Acad. Nat. Sci., 1867, 1G3. 



