ii4 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



length ; pectoral fin to */$ the length of the head ; ventrals reaching 

 vent ; caudal truncate ; caudal peduncle i ^3 to 2 times as long as deep. 



Color brownish above, silvery below, with dark spots which are 

 most conspicuous posteriorly; fins immaculate; total length 84 mm. 



Three specimens from the Rio Santiago, Mexico. (Regan.) 



103. Zoogoneticus diazi Meek. 



Zoogoneticus diazi Meek, Field Col. Mus. Pub. 65, 1902, 93; 



Patzcuaro; Zirahuen. 

 Basin of the Rio Lerma. 



Fie. 32. ZOOGONETICUS DIAZI Meek. 



No. 3618, Field Columbian Museum. 



Head 3^3; depth 3^; D. 17; A. 14; scales 13-34. Body elongate, 

 robust, compressed; back much elevated, forming a prominent angle 

 at the nape; top of head slightly convex; interorbital width 2^ in 

 head; snout bluntish, 4 in head; mouth large, teeth conical in a band 

 in each jaw. the outer series being the larger; lower jaw 'the longer; 

 chin very prominent; eye moderate, 3^ in head; dorsal fin slightly 

 in advance of the anal, its origin midway between base of caudal 

 and posterior margin of opercle; base of dorsal ig in head, its height 

 2 (in male if) in head; pectoral fin if in head; ventral 2f ; alimentary 

 canal scarcely as long as .the body; peritoneum pale. 



Color light olivaceous, young much mottled with darker; the 

 darker in form of irregular cross-bars on the sides; many of the 

 larger specimens in life with a reddish tinge over the body, fading 

 to nearly a uniform light olive ; fins all plain ; the males a little duller 

 and of a more uniform color than the females. Length about 3 

 inches. 



Abundant where found. One female 3 inches in length contained 

 28 young, each .60 inches in length. A second female 3.15 inches 

 in length contained 47 young, each .43 inches in length. The young 

 are born the last of May and early in June. 



