220 CONTEIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
orbital width being nearly half the length of the head. Mouth rather 
large, slightly oblique, the upper lip on the level of the lower part of the 
eye, the maxillary reaching the line of the front of the eye, the upper jaw 
very protractile, the lower jaw included. Eye small, rather high up 
and anterior, G in head. Fins rather large ; dorsal in advance of the 
middle of the body; caudal peduncle rather stout. Scales large and 
silvery; lateral line dqcurved; 23 scales in front of dorsal. Coloration 
pale; back bluish; sides and below silvery; head mostly white; tins 
pale. Head 44 - ; depth 4|. H. 8 ; A. 8 ; scales G-50-5 ; teeth 2, 4-4, 2. 
L. 12 inches. Kocky Mountain region from the Kansas and Yellow- 
stone Elvers to the Saskatchawan ; abundant. 
{Cyprinus (Leuciscus) gracilis Rich, Fauua Bor.-Amer. Pise. 1836, 120: Fogonichthys 
communis Grcl. Proc. Acad. Nat. Sci. Phila. 1856, 188, aad U. S. Pac. R. R. Surv. x, 
247 : Pogonichthys communis Gill, Ichth. Captain Simpson’s Surv. 408: Pogonichthys (Pla- 
iygobis) gidonellus Cope, Proc. Acad. Nat. Sci. Phila. 1864, 277 : Leuciscus gracilis Giin- 
ther, vii, 240: Leucosomus commuriis and guloncUus Gunther, vii, 267, 268.) 
346. P. pallidus Forbes, sj). nov. 
“The depth is contained 4f times in length, and the head 4. The eye 
equals the snout, and enters length of head 3f times and the interor- 
bital space twice. The head is flat above and the snout overhangs the 
mouth, which is large and wide, with a maxillary barbel about one-tliird 
as long as the eye. The mandible reaches a vertical line drawn through 
the middle of the iris in front. The greatest depth of the head enters 
its length 1| times. The scales are G-55-5, with 22 rows before dorsal, 
where they are much smaller than else where. The lateral line is straight, 
except for a few scales in front. The pectoral fins are large and pointed, 
reaching the ventrals, and the latter attain the vent. The front of the 
dorsal is situated a trifle before the ventrals and a little nearer snout 
than caudal. I). 8; A. 8. The color in alcohol is plain, with a 
jflumbeous lustre along sides, and traces of a dusky lateral stripe behind 
dorsal. The pharyngeal teeth are stout, 2, 4-4, 2, hooked, with masti- 
catory surface. L. 24 inches. One specimen from the Ohio Eiver at 
Cairo, probably adult, as the snout is tuberculate.” {Forbes, MSS.) 
95.— SEi^IOTILPS Raiinesque. 
Chubs. 
{Leucosomus Heckel ; Ckilonemus Baird.) 
(Rafinesque, Icbtli. Oh. 49, 1820: type Semotilus dorsalis Rat — Cyprinus corporalia 
Mitch.) 
Body robust. Head large. Mouth terminal, the upper jaw pro- 
tractile, a small barbel on the maxillary just above its extremity. In. 
