1906.] NATURAL SCIENCES OF PHILADELPHIA. 345 



broad silvery band from shoulder to caudal, where it becomes deep 

 brown or dusky and extends out on median caudal rays. A dusky 

 humeral blotch a little larger than pupil. Lower side and under por- 

 tions of body silvered. Fins pale brownish, dorsal and caudal a 

 trifle dusky. Iris brassy. Length 2i| inches (caudal damaged). 

 Possibly from some part of Central America, most likely Nicaragua? 

 Dr. J. F. Bransford. Five examples. 



The others show: Head 3i to 3|; depth 2f to 3^; D. in, 9; A. in or 

 IV, 24? to 26, i; scales 36 in lateral hne to base of caudal, and 2 more 

 on latter; 8 scales obliquely back from origin of dorsal to lateral line; 

 8 scales in a vertical series between lateral line and origin of anal ; eye 

 2f to 24 in head measured from tip of upper jaw; total length of speci- 

 mens lyV to 3^ inches (damaged caudals). The young examples are 

 more elongate and have larger eyes in proportion, though at all ages 

 the caudal and humeral blotches are evident. 



Although the name Tetragonoptenis finitimus was originally proposed 

 by Bocourt {Ann. Sci. Nat. Paris, Zool, 5, IX, 1868, p. 62), his account 

 is entirely too brief and imperfect to permit identification. Prof. 

 Vaillant and Dr. Pellegrin next describe examples from Guatemala 

 which they identify with this species and w^hich seem to agree with 

 my own specimens. 



Astyanax mexioantis (Filippi). 



Tetragonopterus mexicanus Jordan and Snyder, Bull. U. S. Fish Comm., 



XIX, 1899 (1901), p. 125. Rio Ixtla at Puente de Ixtla, Morelos. Profs. 



D. S. Jordan and J. O. Snvder. 

 Tetragonopterus streetsii Cope, Proc. Acad. Nat. Sci. Phila., 1871 (November 



28), p. 217. From the headwaters of the Coatzacalcos River among the 



Cordilleras. Dr. T. Hale Streets. 

 Tetragonopterus argentatus Cope, Proc. Amer. Philos. Soc. Phila., XXII, 1885 



(December 10, 1884), p. 1G8. In the city of Monterey. Prof. E. D. Cope. 



Jordan and Snyder, I.e., Rio Verde near Rascon. Fowler, Proc. 



Acad. Nat. Sci. Phila., 1904 (April 7), p. 248. Del Rio and De\al's River, 



Texas. Dr. H. A. Pilsbry. 

 A very large series of examples of most all ages from Rio Ixtla at 

 Puente de Ixtla, Morelos, and Rio Verde near Rascon, Mexico. These 

 collected and presented by Profs. Jordan and Snyder. Also a large 

 series from Monterey, Mexico, from Prof. E. D. Cope, and others from 

 the same evidently from Mexico. Others from Del Rio and Devil's river, 

 Texas, from Dr. H. A. Pilsbry. All show the following: Head 3 to 4; 

 depth 2^ to 3f ; D. in, 9, though sometimes ii or in, 8, and rarely in, 

 10; A. ni to iv, 17, i to 24, i, usually 21 or 20, frequently 19 or 22, 

 others with 23 and occasionally 24, though rarely 17 or 18; scales in 

 lateral line to base of caudal 32 to 37. and 2 or 3,more on latter, usually 

 35, frequently 34 or 36, and rarely 32, 33 or 37 ; 7 or 8 scales in an oblique 



