430 



PROCEEDINGS OF THE ACADEMY OF 



[June, 



Also several from Lago de Guzman, Chihuahua, Mexico (Dr. 

 P. P. Calvert). 



Cyprinodon bovinus rubrofluviatilis subsp. nov. Fig. 4. 



Head 3; depth 2|; D. i, 9; A. i, 10; P. i, 15; V. i, 6; scales 27 

 in median lateral series to caudal base and 4 more on latter; 14 

 scales transversely between dorsal and anal origins; about 25 pre- 

 dorsal scales; head width 1| in its length; head depth at occiput 

 l£, lower jaw 3|; third branched dorsal ray \\; fourth branched 

 anal ray If; least depth of caudal peduncle If; caudal If; pectoral 

 If; ventral 2|; snout 3| in head measured from upper jaw tip; 

 eye 3|; maxillary 3; interorbital space 2f. 



Body well compressed, deepest at dorsal origin, predorsal with 



Fig. 4. — Cyprinodon bovinus rubrofluviatilis Fowler. 



median trenchant keel and well arched before dorsal fin. Caudal 

 peduncle compressed, its least depth li in its length. 



Head compressed moderately, upper profile more inclined than 

 lower, and lower sides not especially converging below. Snout 

 short, wide, and length about § its width. Eye moderate, high, 

 centre about first § in head. Jaws greatly protractile, upper at least 

 distensible space equal to snout length. Maxillary nearly vertical, 

 largely concealed. Lips moderate. Teeth uniserial, compressed, 

 each tricuspid and expanded terminally., Inner upper and lower 

 buccal folds moderately wide. Tongue fleshy, small, depressed, 

 little free around edges. Lower jaw slightly protruding in front, 

 oblique to somewhat vertical, shallow, and rami not elevated inside 



