PEECINA. — ETHEOSTOMA. 33 



VI-XVII 8-17 raj's. Anal short, with I-II 6-12 rays. Pectorals symmetrical, rounded. Yentrals 

 below or behind the base of the pectorals, each with a moderate or feeble spino and 5 branched rays ; iici 

 scaly axillary process. 



The work of Boulenger and of Jordan and Evcrmann renders a full account 

 unnecessary, but I have examined the examples in the British Museum collection. 



Synopsis of the Species of Mexican Percidse. 

 I. Dorsal XIII-XVII 12-17; lateralline complete Ferciria caprodes. 



II. Dorsal IX-XII 9-13 ; lateral line incomplete. 



A. Lateral line forming a curve above the pectoral. Anal II 6-8 . Etheostoma fusiforme . 



B. Lateral line nearly straiglit. 

 a. Anal II G-8. 



Caudal peduncle a little longer than deep E. pottsii. 



Caudal peduncle nearly twice as long as deep . E. lepidxim. 



h. Anal 17-8 E. australe. 



III. Dorsal VI 10 E. laterale. 



1. PEECINA, Haldeman, 1842. 

 Percina, Bouleng. Cat. Fish, i, p. 56 (1895). 



1. Percina caprodes, Eafin., 1818. 



Percina caprodes, Bouleng. Cat. Fisli. i. p. 57 (1895) ; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 



1896, p. 1026. 

 Depth of body 5 to 6^ in the length, length of head 4 to 4|. Snout projecting beyond the mouth, which is 



inferior. Dorsal XIII-XVII 12-17. Anal II 9-12. Scales 90-95 y~^^. Lateral line complete. 



Olivaceous, with numerous dark vertical bars, usually alternately long and short. 



Ilab. NoETH 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. 



Etheostoraa fusifonie, Bouleng. Cat. Fish. i. p. 75 (1895). 



Bolekhthys fusiformis, Jord. & Everm. Bull. U.S. Nat. Mus. slvii. 1896, p. 1101. 



Depth of body 4 to 6 in the length, length of head 3| to 4. Dorsal IX-X 9-12. Anal II 6-8. Scales 



43-60 j2_i,3. Lateral line incomplete, forming a curve above the pectoral. Olivaceous, with darker spots 



and cross-bars. 



Hab. North America, Massachusetts to the Rio Grande. 



BIOL. CENTR.-AMER., Pisces, February 1907. F 



