50 G COXTEIBUTIOXS TO NOETII AMEEICAN ICHTHYOLOGY IV. 
790. II. eaig'ii’ofascialBis Agassiz. — Craivl-a-hottom. 
riead and body stout and heavy, the body compressed. Mouth moder- 
ate, the maxillary reaeliiug front of eyef eye moderate, 4 in head. 
Scales rather large. Fins all large. Breast usually naked, but some- 
times closely scaled; scales ou the median line of the belly somewhat en- 
larged, but not caducous nor especially spinous. Dark olive above, with 
blackish markings; sides with vertical bars, somewhat diamond-shaped, 
but quite narrow; these acute above and below, more or less confluent 
along the middle, about 12 in number; the bauds dark greenish, vary- 
ing to jet black, most distinct near the middle of the body and broadest 
behind; inner half of each of the vertical fins black; outer half more or 
less speckled and barred; top of head black, a black band through eye 
and snout, and a dark vertical shade below the eye; a small black spot 
between two smaller ones at base of caudal flu. Head 4; depth 5. D. 
XIl-12; A. II, 10; scales 7-58-15. L. 4 inches. Fivers of the Southern 
States from South Carolina to Louisiana; one of the largest of the 
darters. 
(Agassiz, Amer. Journ. Sci. Arts, xvii, 305, 1854; Jordan, Ann. Lyc. Nat. Hist. N. 
Y., 1877, 310: Plesioperca anccps Vaillant, 1. e., 37: Alvordius spiUniani Hay, Proc. 
U. S. Nat. Mns. 1880, 491, from Cliickasawlia Eivcr, Mississippi, specimens with the 
eye larger, the snout more pointed, the lius higher, and the color very dark.) 
263.— AOTHONOTUS Agassiz. 
Blue-hreasted Barters. 
(Agassiz, Bull. Mns. Comp. Zool. 1883, i, 3: type Etheosioma maculatum Kirtland.) 
Body robust, or rather elongate, comiiressed. Mouth terminal, mod- 
erate ;' the lower jaw somewhat included ; premaxillaries not protractile ; 
maxillary movable. Teeth strong, present on vomer and palatines. 
Gill-membranes scarcely connected. Scales moderate or small, ctenoid; 
those of the middle line of the bell}^ not enlarged, persistent. Lateral 
line well developed, nearly straight. Fins large, with strong spines ; 
first dorsal longer and larger than the second with 10 to 15 spines ; anal 
with two strong spines, the anterior usually the larger. Coloration 
often brilliant. prominent ; vwrtx;, back, in allusion to the large 
size of the dorsal fins, the name given in opj^osition to Catonotus.) 
a. Head short, the muzzle abruptly decurved; lat. 1. 52; dorsal spines 10 to 12 : fins 
dark-edged. 
791. N. Ciliiiitriis (Cope) Jor. — Blue-hreasted Darter. 
Body stout; head short; muzzle abruptly decurved, the mouth some- 
what inferior; lower jaw included. Caudal broad, truncate. Males very 
