132 FIELD COLUMBIAN MUSEUM -ZOOLOGY, VOL. V. 



Basin of the Rio Lerma. 



FIG. 38. GAMBUSIA INFANS Woolman. 



No. 45570. U. S. National Museum. 



Head 4^; depth 3^"; D. 7 ; A. 7; scales 8-28. Body robust, 

 moderately compressed; head small, flat above, its interorbital width 

 2 in head; snout 4 in head; mouth small, lower jaw the longer; teeth in 

 jaws in bands, outer series the larger; diameter of eye 3 in head; origin 

 of dorsal over last anal rays, its distance from base of caudal 1^3 in 

 distance from tip of snout ; pectoral i l /^ in head ; ventral 2 ^ ; caudal 

 fin truncate; least depth of caudal peduncle i^ in head; alimentary 

 canal about i X times the length of fish ; peritoneum dusky, 



Color light olivaceous ; edges of scales darker ; a narrow dark stripe 

 on body; belly and sides not punctulate with dark dots; fins all plain. 

 Length about 2 inches. 



The young of this species are born about the middle of June. 



122. Gambusia bonita sp. nov. 



Type, No. 4630, F. C. M., 2.5 inches in length; Refugio, Vera 

 Cruz. 



Upper tributaries of the Rio Papaloapam. (Motzorongo; Refugio.) 



FIG. 39. GAMBUSIA BONITA Meek. 



