MAY, 1902. THK ICHTHYOLOGY OF MEXICO MKEK. 119 



having a much deeper body, no blue stripes on the cheeks and a 

 smaller eye. 



Ovaries well developed, spawning season probably the latter 

 part of July or early in August. Abundant at Jimenez; one 

 specimen also taken at Santa Rosalia. Jimenez; Santa Rosalia. 



PERCID.E. 

 Etheostoma pottsii (Girard). 



This species is quite abundant in the head waters of the trib- 

 utaries of the Rio Conchos. With the following species it is the 

 most westerly of the group to which it belongs. Very few other 

 darters, if any, are found at 'as high an altitude as are these two 

 species. E. boreale, found in Hudson Bay and St. Lawrence 

 Basins, is its most nearly related species. San Andres; Santa 

 Rosalia; Chihuahua; Jimenez. 



Etheostoma australe Jordan. 



Found with the preceding. Very abundant. No darters have 

 yet been found in the head waters of the Rio Yaqui, though this 

 river seems to have gotten its fauna from the head waters of the 

 Rio Conchos or other tributaries of the Rio Grande. San Andres; 

 Santa Rosalia; Chihuahua; Jimenez. 



CENTROPOMID.E. 

 Centropomus undecimalis (Bloch). 

 Common at La Antigua. 



Centropomus ensiferus Poey. 



A few small specimens from La Antigua, largest 2.50 inches. 



GERRID.E. 



Eucinostomus harengulus Goode & Bean. 

 La Antigua, common. 



Cichlasoma eigenmanni, sp. nov. 



Type, No. 3712, F. C. M. Length, 6.65 inches. 

 Locality, Rio Tehuacan, Venta Salada, Pueblo, Mexico. 

 Head 3^; depth 23; D. xvii, 14; A. V., 10; scales 6-33-11. 

 Body rather elongate, profile convex but not very stoep; mouth 



