34 ACANTHOPTERYGII. 
2. Etheostoma pottsii, Girard, 1859. 
Etheostoma pottsii, Bouleng. Cat. Fish. i. p. 74 (1895) ; Jord. & Everm. Bull. U.S. Nat. Mus. 
xlvii, 1896, p. 1083. 
Depth of body 34 to 4 in the length, length of head 34 to 33. Dorsal IX-X1 10-12. Anal II7. Seales 
44-50 oti Caudal peduncle a little longer than deep. Olive, barred and marbled with brownish. 
Hab. Mexico, Chihuahua and Durango. 
3. Etheostoma lepidum, Baird & Girard, 1853. 
Etheostoma lepidum, Bouleng. Cat. Fish. i. p. 73 (1895) ; Jord. & Everm. Bull. U.S. Nat. Mus. 
xlvii. 1896, p. 1089. 
Depth of body 42 in the length, length of bead 4}. Dorsal IX-X 10-13. Anal II 6-8. Scales 48-54 ae 
Caudal peduncle nearly twice as long as deep. Olive, with some more or less distinct dark vertical bars. 
Hab. Nortu America, Texas. —Mexico, Chihuahua. 
4. Etheostoma australe, Jordan, 1888. 
Etheostoma australe, Bouleng. Cat. Fish. i. p. 88 (1895) ; Jord. & Everm. Bull. U.S. Nat. Mus. 
xlvii. 1896, p. 1081. 
Depth of body 4342 in the length, length of head 34 to 33. Dorsal X-XII 9-11. Anal 17-8. Scales 
58-66 aan Olive, with about 10 strongly-marked dark vertical bars. 
Hab. Mexico, Rio Conchos in Chihuahua. 
5. Etheostoma laterale, Girard, 1859. 
Etheostoma laterale, Bouleng. Cat. Fish. 1. p. 87 (1895). 
Alvarius lateralis, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 1099. 
Body slender, elongate. Dorsal VI 10. Anal 8. Scales very small. Brownish, spotted with black; a 
narrow blackish lateral stripe, which extends round the snout ; first dorsal with a black spot on its upper 
posterior edge; caudal barred. 
Hab. Rio GRANDE. 
Fam. 8. CENTRARCHIDZE. 
This family comprises the Indo-Pacific genus AKuhlia and the allied Hdelia and 
Nanoperca from the fresh waters of Australia, and about thirty species, which 
may be grouped into eight or nine genera, from the fresh waters of North America. 
Six species range into Northern Mexico, but only one of them extends further south 
than the southern tributaries of the Rio Grande. 
These may be distinguished from other Perch-like fishes of Mexico by the following 
combination of characters :— 
«A single dorsal fin, with X-XI 10-13 rays, the middle spines the longest ; anal with III 8-12 rays; 
ventrals below or a little behind the base of pectorals, close together, each with I 5 rays, without scaly 
axillary process. Lateral line concurrent with the dorsal profile. Head without spines or serre.” 
