496 COXTEIBUTIONS TO NOETH AMEEICAN ICHTHYOLOGY — IV. 
cles scaly j the cheek scales small and closely set ; a triangular series 
of scales on temporal region ; throat smooth ; neck above closely 
scaly ; belly closely scaled. Fins large ; spinous dorsal high, the 
second still higher, but smaller than the first, its base about equal to 
the length of the head; dorsal fins contiguous, slightly connected. 
Color olivaceous ; head above entirely black ; back with 8 dark cross- 
bars ; about 11 bar-like blotches, somewhat indistinct, arranged along 
the lateral line; fins chiefly black; membranes of the second dorsal 
and ventral fins entirely black, that of the spinous dorsal with a broad 
black horizontal bar at base, above which are numerous distinct black 
oblique streaks ; anal with a broad black bar; caudal and pectoral fins 
largely dusky. Females and young probably paler. Head ; depth 
4J. D. XIl-lO; A. II, 7; Lat. 1. (not counted). L. inches. Cum- 
berland River; but one specimen known. 
{Arlina atrwianis Jordan, Ball. U. S. Nat. Mas. 1877, 10; Jordan, Man. Vert. ed. 
2,223.) 
775, U. siBai©tea*a (Cope) Jordan. 
Body short and rather deep. Head small ; the snout very obtuse, as 
blunt as in Dlplesiiini. Cheeks, opercles, and breast scaly. Dorsal fins 
well separated. Back and sides each with a series of quadrate blackish- 
green blotches; belly saffron-color; upper parts sprinkled with red 
spots ; first dorsal margined with orange-red ; a row of oval red spots 
across the middle of the fin ; second dorsal with the membrane chiefly 
blood-red; a black spot on occiput and opercle; a dark strii)e downward 
and one forward from eye; caudal fin brown, barrel 1. Head 5; depth 
4. D. X-11 ; xl. II, 7 ; scales 10-'-52-12. L. 3 inches. Headwaters of 
the Tennessee and Cumberland rivers; an elegant and peculiar species, 
carrying to an extreme the gobioid appearance of these fishes. 
( Hfiosfoma siniotermn Cope, Joiirn. Acad. Nat. Sci. Phila. 1858, 215 : Htiostomasimoterum 
Vaillant Eecherclies, 100: Diplesiuni simoteruni Jordan, Man. Vert. ed. 2, 223.) 
257.— DlPlxE§IUM Eafinesque. 
{Rijosfoma Agassiz. ) 
{Diplesion Eafinesque, Ichtli. Oli. 1820, 37; type Etheostoma dlennioides Eaf.) 
Body elongate, subterete. Head very short and blunt, with tumid 
cheeks; the profile very convex. Mouth sm'all, inferior, horizontal. Pre- 
maxillaries protractile, little movable, joined to the forehead mesially 
by a slight frenum ; maxillary not protractile, adnate for most of its 
length to the fleshy skin of the preorbital; lower jaw very short; teeth 
