34 ACANTHOPTERTGII. 



2. Etlieostoma pottsii, Giiard, 1859. 



Etheostoma pottsii, Boulcug. Cat. Fisli. i. p. 74 (1895) ; Jord. & Everm. Bull. U.S. Nat. Mils. 



xlvii. 1896, p. 1083. 

 Depth of body 34 to 4 in the length, length of head 3^ to 3,|. Dorsal IX-XI 10-12. Anal II 7. Scales 

 44-50^ . Caudal peduncle a little longer than deep. Olive, barred and marbled with brownish. 



Hah. Mexico, Chihuahua and Durango. 



3. Etheostoma lepidum, Band & Guard, 1853. 



Etiivostoma lepidum, Bouleiig. Cat. Fish. i. p. 73 (1895) ; .lord. & Everm. Bull. U.S. Nat. Mus. 

 slvii. 1896, p. 1089. 



Depth of body 4 J in the length, length of head 4|. Dorsal IX-X 10-13. Anal U G-8. Scales 48-54 y. 

 Caudal peduncle nearly twice as long as deep. Ulive, with some more or less distinct dark vertical bars. 



Ifab. NoiiTH America, Texas. — Mexico, Chihuahua. 



4. Etheostoma australe, .Jordan, 1888. 



I'^t/ieostoma australe, Bouleug. Cat. Fish. i. p. 88 (1895) ; Jord. & Everm. Bull. U.S. Nat. Mu.s. 



xlvii. 1896, p. 1081. 

 Depth of body 4J-4f in the length, length of head 3^ to 3^^. Dorsal X-XII 9-11. Anal I 7-8. Scales 

 58-60 ifpp;- Olive, with about 10 strongly-marked dark vertical bars. 



Hab. Mexico, Pdo Conches in Chihuahua. 



5. Etheostoma later ale, Giraid, 1859. 



Etheostoma laterale, Bouleug. Cat. Fish. i. p. 87 (1895). 



Alvarius lateralis, Jord. & Fverm. Bull. U.S. Nat. :Mus. xlvii. 1896, p. 1099. 



l!ody 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. 



Hub. Rio Guande. 



Fam. 8. CENTRARCHID^. 



This family comprises the Indo-Pacific genus Knhlia and the allied Edelia and 

 yanoperca 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; 

 vcntrals below or a little bobiud tho base of pectorals, close together, each with I 5 rays, without scaly 

 a.xiUary process. Lateral lino concurrent with tlie dorsal prolilc. Head without spines or serraj." 



