DEC. 28, 1916. FISHES or PANAMA MEEK AND HILDEBRAND. 271 



opposed to the premaxiltary teeth; the latter narrow at bases, broad at 

 tips, the cusps of about equal length, forming a straight transverse 

 cutting edge; no teeth on sides of lower jaw; gill-membranes broadly 

 united, free from the isthmus; gill-opening short; gill-rakers very short; 

 lateral line complete; scales moderate, 35 to 45 in lateral series, a few 

 large scales on caudal lobes; dorsal fin inserted in advance of middle 

 of body, partly in front of ventrals; anal very short; pectorals and ven- 

 trals similar, short and broad; adipose fin minute, over posterior rays of 

 anal. 



23. Apareiodon dariensis (Meek & Hildebrand). 



Parodon dariensis Meek & Hildebrand, Field Mus. Nat. Hist. Pub., 



Zool. Ser., X, 1913, 83 (Rio Cupe, Cituro, Darien, Panama). 

 Apareiodon dariensis Eigenmann, Ann. Carnegie Mus., X, 1915 (1916), 



?i- 



Head 4.6 to 4.7; depth 4 to 4.2; D. n; A. 9; scales 35 to 37. 



Body elongate, not much compressed; dorsal profile anteriorly 

 evenly convex; lower outline anteriorly straight, parallel with longitu- 

 dinal axis of body; head not deeper than wide; snout pointed, much in 

 advance of mouth, 2.8 to 3 in head; eye 4.2 to 4.4; mouth very small, 

 inferior; the lower lip with a straight transverse margin in the largest 

 specimen, the type, in the next largest it is somewhat rounded, in the 

 smallest it is distinctly triangular and feebly 5 lobed; lower jaw entirely 

 without teeth in the 3 specimens at hand; teeth in upper jaw in the 

 largest specimen very narrow at base expanded at tip, with a transverse, 

 pectinate margin; teeth of middle size specimen narrow at base, then 

 expanded and again narrower at tip, one of the cusps much enlarged, 

 pointed; those of the smallest specimen narrow at base, much expanded 

 at tip with an oblique, smooth margin; lateral line complete, straight, 

 very feebly developed, especially in our smallest specimen; scales 

 moderate, striate, regularly placed, 10 or n in median series in advance 

 of dorsal; 2^ rows between lateral line and base of anal; 5 or 6 across 

 caudal peduncle from one lateral line to the other; dorsal fin inserted 

 in advance of ventrals, its origin midway between tip of snout and tip 

 of adipose or a little nearer the latter; adipose fin small, over posterior 

 rays of anal; caudal fin forked, with a few large scales on base of fin; 

 anal fin very small, shorter than dorsal, its origin nearer base of caudal 

 than base of ventrals; ventral fins very broad, with 9 rays, reaching past 

 vent which is situated midway between base of ventrals and origin of 

 anal; pectoral fins broad, with 14 rays, inserted under margin of 

 opercle, reaching about % of the distance from their base to origin of 

 ventrals. 



