DEC. 28, 1916. FISHES OF PANAMA MEEK AND HILDEBRAND. 367 



Chonophorus taiasica (in part) Jordan & Eigenmann, Proc. U. S. Nat. 



Mus., IX, 1886, 500; Meek, Field Mus. Nat. Hist. Pub., Zool. 



Ser., X, 1914, 131 (East slope of Costa Rica). 

 Chonophorus mexicanus Jordan & Eigenmann, Proc. U. S. Nat. Mus., 



IX, 1886, 501 (Eastern slope of Mexico). 



Awaous taiasica Jordan, Proc. Cal. Ac. Sci., ad Ser., V, 1895, 494 (Presi- 

 dio) ; (in part) Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 



1898, 2236. 

 Awaous mexicanus Jordan & Evermann, Bull. U. S. Nat. Mus., XLVII, 



1898, 2237. 

 Chonophorus banana (in part) Regan, Biol. Cent. Amer., Pisces, 



1905, ii. 



Head 3.4 to 3.9; depth 4.75 to 5.55; D. VI-I, 10; A. I, 10; scales 69 

 to 76. 



Body anteriorly subcylindrical, posteriorly compressed; head rather 

 large, wider than deep; snout long, 2.04 to 2.6 in head; eye small, 5.25 

 to 7.5; interorbital 6.25 to 9.7; mouth large, horizontal; upper jaw pro- 

 jecting, the lip thickened; maxillary not quite reaching anterior margin 

 of eye, 2.5 to 3 in head; teeth small, pointed, in a narrow band in each 

 jaw; gill-openings rather small, the membranes broadly attached to 

 isthmus; scales small, ctenoid, except the reduced scales on predorsal 

 region and abdomen; about 20 rows of scales between anterior rays of 

 second dorsal and anal; head and chest mostly naked; origin of first 

 dorsal notably nearer snout than base of last ray of second dorsal, the 

 spines short and weak, rarely reaching second dorsal; origin of second 

 dorsal about midway between posterior margin of eye and base of cau- 

 dal, the rays rather short; caudal fin scaly at base, the margin rounded; 

 anal fin similar to second dorsal; ventral fins not much longer than snout; 

 pectoral fins rather short, 1.3 to 1.73 in head. 



Color yellowish green; back and sides spotted and mottled with 

 dark brown; a series of dark blotches along side; sides of head usually 

 with a few dark stripes. Dorsals, caudal and sometimes the pectorals 

 with dark spots on the rays forming cross-bars; pectorals with a short 

 black bar at base of upper rays, running downward and backward; 

 anal and ventrals unmarked. 



Of this species we have 48 specimens, ranging from 50 to 215 mm. in 

 length. These were taken at various places in the Chagres Basin, but 

 always in fresh water, most usually in the lower courses of the streams, 

 but a few of them are from the Upper Chagres. 



We have compared specimens from Guatemala and Costa Rica with 

 our Panama material and find that the differences between the Pacific 

 and Atlantic slope forms as set forth in the above key also are true for 



