64 TELEOSTEI. — EVENTOGNATHI. — XI. 
e. Lower lobe of C. chiefly black; upper lobe pale; color pale, un- 
spotted. 
138. H. gelidus (Girard). Veryslender; snout long, thick, blunt, 
overhanging the rather large mouth; barbel as long as eye; eye 
44 in head; fins all high; P. as long as head; C. deeply forked. 
Head 4; depth 54. A.7. Lat.144. L.2. Missouri River, abun- 
dant in the river channels but not ascending brooks; a singular 
little fish. (Lat., frigid.) 
ee. Lower lobe of C. pale, like the upper; body dusted with dark 
specks. 
139. H. hyostomus (Gilbert). Body and head very slender; 
snout long, acute, projecting beyond mouth for half its length; 
mouth short, wide, inferior ; eye 3} in head; barbel long; P. large, 
other fins small; 13 scales before D. Head 4; depth 5}. A. 8. 
Lat. 1. 37. L. 24. Silvery, dusted with dark specks. Ind. to 
Iowa. (Similar species are H. estivalis Girard, Ark. to Mexico, 
still more slender, with longer snout and much smaller eye, 4 in 
head, and H. tetranemus Gilbert, Kansas, nearly like H. estivalis, 
but with two barbels on each side.) (ds, hog; ordya, mouth.) 
dd. Dorsal fin with a large black blotch on its last rays; scales small. 
140. H. monachus (Cope). Body slender; head long and 
slender; eye 44 in head; 24 scales before D. Olivaceous, sides 
silvery; a black spot at base of C.; no lateral band; scales not 
speckled. Head 4; depth 54. A.8. Scales8-56-4. L.4. Tenn. R. 
(Lat., solitary.) 
bb. Eyes very large, 2? to 3 in head; barbels conspicuous; D. inserted more 
or less before V.; body not conspicuously speckled. 
J. Teeth 4-4; sides with dark blotches. 
141. H. dissimilis (Kirtland). Body very long and slender; 
head long, the snout blunt at tip, projecting beyond the small 
mouth ; eye 2% in head; P. long; 22 scales before D. Olivaceous, 
with dusky lateral band, along which are several large round dusky 
spots, the most distinct at base of C. Head 44; depth 54. D. 8. 
A. 7. Scales 6-47-5. L.5. Lake Erie to Ky, and Iowa. (Lat., 
unlike.) 
Jf. Teeth, 1, 4-4, 1 or 0. 
g. Sides with a dark lateral band overlaid by silvery. 
142. H. amblops (Rafinesque). Body slender, the head large, 
flattish above; eye longer than snout, 3 in head; mouth small ; 
snout bluntly decurved ; 16 scales before D. Greenish; sides with 
a blackish or plumbeous band extending around snout, overlaid by 
silvery. Head 4; depth 5. Scales 5-38-4, L. 4. Ohio Valley to 
Ala.,common. Smaller than the next, and somewhat different in 
color. (dpBrvs, blunt; dy, face.) 
