436 PROCEEDINGS OF THE ACADEMY OF [June, 



Belonesox belizanus Kner. 



Orizaba, Mexico. 



Pseudoxiphophorus bimaculatus (Heckel). 



Orizaba and Jalapa in Vera Cruz (Dr. P. P. Calvert), Mexico. 

 One example from Orizaba adult, and with exceptionally produced 

 hunch on the predorsal region. 



Heterandria formosa (Girard). 



Tick Island in Spring Garden Creek, St. John's River basin (Dr. 

 H. A. Pilsbry), Florida. 



Poeciliopsis occidentalis (Baird and Girard). 



Heterandria occidentalis Baird and Girard, Proc. Acad. Nat. Sci. Phila., 

 1853, p. 390. Rio Santa Cruz, Tucon, Arizona. 



No. 6,972, A. N. S. P., cotype of H. occidentalis Baird and Girard. 

 Rio Santa Cruz, Tucon, Arizona. Smithsonian Institution (No. 

 3,511). 



Many examples also from the above locality September, 1910, 

 and others from the Salt River in the Gila basin (Dr. H. A. Pilsbry). 



This species has recently been placed in Mollienisia by Dr. Regan, 

 but the comparison of my series shows it belongs to Poeciliopsis. 



Poeciliopsis lutzi (Meek). 



Head 3f to 3|; depth 3| to 4; D. i, 7; A. in, 7; scales 25 to 27 

 in median lateral series to caudal base, and 2 or 3 more on latter; 

 S or 9 scales between dorsal and anal origins ; snout 3| to 4^ in head ; 

 eye2|to3|; maxillary 2f to 4; interorbital 2 to 2\. Body elongate, 

 fusiform, compressed. Head depressed above. Snout truncate as 

 viewed above, length about f its width. Eye close to upper profile, 

 ■centre at first third in head length. Mouth wide, upper jaw greatly 

 protractile. Maxillary nearly vertical. One row of slender bent 

 spoon-like flexible teeth in each jaw. Lower jaw truncate, scarcely 

 projects. Interorbital flat. Rakers about 14 slender weak points, 

 \ of filaments. Scales mostly uniform, single row on cheek. Dorsal 

 inserted at last third in space between snout tip and caudal base. 

 Anal inserted little nearer pectoral origin than caudal base. Caudal 

 convex behind. Pectoral reaches nearly f to anal, ventral f to vent. 

 Color in alcohol pale brownish, obscure darker blotch on most scales 

 on back. Sides of head and costal region silvery-white. Row of 

 eight to ten small brownish spots, concurrent with vertebral axis of 

 body along its sides, each spot not greater than diameter of eye. 

 Conspicuous blackish blotch at anal origin, sometimes absent or 

 represented by dark basal line, in smaller examples. Fins pale, 



