132 Field Columbian Museum — Zoology, Vol. V. 



Basin of the Rio Lerma. 



FlG. 38. GAMBUSIA INFANS Woohnan. 

 No. 45570. U. S. National Museum. 



Head 4^ ; depth 3^2; 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% in 

 distance from tip of snout; pectoral 1^3 in head; ventral 2%; caudal 

 fin truncate; least depth of caudal peduncle 1% in head; alimentary 

 canal about 1 % 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.) 





Hi *^mn 



Fig. 39. Gambusia bonita Meek. 



