PERCINA.—ETHEOSTOMA. 33 
VI-XVII 8-17 rays. Anal short, with I-II 6-12 rays. Pectorals symmetrical, rounded. Ventrals 
below or behind the base of the pectorals, each with a moderate or feeble spine and 5 branched rays; no 
sealy axillary process. 
The work of Boulenger and of Jordan and Evermann renders a full account 
unnecessary, but I have examined the examples in the British Museum collection. 
Synopsis of the Species of Mexican Percide. 
I. Dorsal XTJI-X VII 12-17; lateral lime complete. . . . . . . Percina caprodes. 
Il. Dorsal IX-—XII 9-18; lateral line incomplete. 
A. Lateral line forming a curve above the pectoral. Anal Il 6-8 . Etheostoma fusiforme. 
B. Lateral line nearly straight. 
a. Anal II 6-8. 
Caudal peduncle a little longer than deep . . . . . . 2 1... OE. pottsii. 
Caudal peduncle nearly twice aslongasdeep . . . . . . . . .) . OK. lepidum. 
6. AnalI 7-8 . . 2... wee ee ee E. australe. 
III. Dorsal VI10 . 2. 2... ww ee ew. E., laterale. 
1. PERCINA, Haldeman, 1842. 
Percina, Bouleng. Cat. Fish. 1. p. 56 (1895). 
1. Percina caprodes, Rafin., 1818. 
Percina caprodes, Bouleng. Cat. Fish. i. p. 57 (1895) ; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 
1896, p. 1026. . 
Depth of body 5 to 63 in the length, length of head + to 437. Snout projecting beyond the mouth, which is 
inferior. Dorsal XIII-XVII 12-17. Anal II 9-12. Scales 90-95 =". Lateral line complete. 
Olivaceous, with numerous dark vertical bars, usually alternately long and short. 
Hab. Nortu America, Great Lakes to the Rio Grande. 
This is the largest of all the Darters, attaining a length of 200 mm. 
2. ETHEOSTOMA, Rafin., 1819. 
Etheostoma, Bouleng. Cat. Fish. i. p. 64 (1895). 
1. Etheostoma fusiforme, Girard, 1854. 
Etheostoma fusiforme, Bouleng. Cat. Fish. i. p. 75 (1895). 
Boleichthys fusiformis, Jord. & Everm. Bull. U.S. Nat. Mus. xlvi. 1896, p. 1101. 
Depth of body 4 to 6 in the length, length of head 31 to 4. Dorsal [IX-X 9-12. Anal II 6-8. Scales 
43-60 a Lateral line incomplete, forming a curve above the pectoral. Olivaceous, with darker spots 
and cross-bars. 
Hab. Norta America, Massachusetts to the Rio Grande. 
BIOL. CENTR.-AMER., Pisces, Ledruary 1907. F 
