196 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
reaching only half way to ventrals. Color silvery; the scales punctate 
with blackish; a dark band from the sboulders to the base of caudal; 
another from the end of the muzzle, across operculum, to base of anal. 
Head 4§; depth 4. D. 8; A. 7; scales 12-53-11; teeth 2, 4-4, 2. L. 3 
inches. Warm Springs, Utah. {Cope.) 
{Hjihopns bivittatus Cope, Hayden’s Geol. Snrv. Terr, for 1871, 1872, 474.) 
28.5. HI. timpanogensis (Cope) .1. & G. 
Body stout, rather compressed. Head heavy. Mouth oblique. Eye 
longer than muzzle, 3.^ in head. Dorsal fin slightly in front of ven- 
trals; pectorals iiQt reaching to ventrals, the latter reaching vent. 
Lateral line more or less incomplete (in the typical examples, which are 
all young; it is probably complete in the adult). Color brownish; the 
scales finely dusted with black points; a plumbeous lateral streak; 
cheeks silvery ; fins dusky. Head 3f ; depth 4 ; scales 13-52-G ; teeth 
2, 4-4, 2. L. 2 inches. Streams of Utah. {Cope.) This species and 
the preceding are perhaps young Squalii. 
{Hijbopsis timpanogensis Cope, Proc. Amer. Phil. Soc. Phihi. 1874, 134: Hyhojms tim- 
panogensis Cope & Yarrow, Zodl. Wheeler’s Expl. W. 100th Mer. 604.) 
c. Scales comparatively small, more or less closely imbricated, and with the exposed 
edges deep (as in Codoma and Luxiliis ) ; scales in front of dorsal small ; te.eth 
with the grinding surface more or less developed. {Lijthrurus Jordan.*) 
d. A black spot at base of dorsal in front. 
286. M. cyaiiocepliallBS (Copeland) Hay. — Hoy’s Bed-fish, 
Body short, stout, chubby, moderately comiiressed. Dorsal outline 
elevated, the axis of the body being half nearer the ventral outline 
than the dorsal. Caudal lieduncle short, not contracted, tlie form re- 
sembling that of Pimephales. Head very short, deep, its greatest depth 
three-fourths its length. Snout blunt, shorter than eye. Mouth large, 
very oblique, lower jaw projecting, maxillary reaching to border of eye. 
.Eye large, 3 l in head, not so wide as the interorbital space. Fins large. 
Dorsal well behind ventrals, its longest ray about as long as head ; pec- 
torals not reaching ventrals, the latter to anal. Scales small, much 
crowded anteriorly. Lateral line strongly decurved. Dorsal scales 
small; thoracic region mostly naked. Coloration <lark bluish above; 
sides not silvery. Males in spring jirofusely covered with small tuber- 
cles; the sides and fins clear, bright red; the back, and especially the 
top of the head, of a clear glaucous blue. Dorsal fin in both sexes with 
a large black spot at the base of its anterior rays, this sjiot about as 
•Jordan, Man. Vert. 187(5, 272: typo Semotilus diplemius Raf. {XvSpoy, blood; 
ovpdy tail.) 
