32 2 Field Museum of Natural History — Zoology, Vol. X. 



reaching about one-third the distance to eye; teeth in the jaws pointed, 

 in narrow bands, the outer ones somewhat enlarged; scales moderate, 

 cycloid, extending forward to the eyes; caudal peduncle strongly com- 

 pressed, its least depth 1.4 to 1.7 in head; origin of dorsal in female just 

 behind base of last ray of anal and about equidistant from posterior 

 margin of eye and tip of caudal or slightly nearer the latter; in the male 

 this fin is somewhat nearer posterior margin of eye than tip of caudal; 

 caudal fin rounded; anal fin in the female inserted about equidistant 

 from posterior margin of eye and base of caudal, its posterior margin 

 nearly straight; in the adult male this fin is inserted a little nearer tip of 

 snout than base of caudal, the longest modified ray 2.6 to 2.7 in body; 

 the first ray strongly serrate, with a hook at apex directed downward 

 and forward, the anterior branch of second produced ray curved for- 

 ward, the second branch shorter; ventral fins rather small, reaching 

 origin of anal in female and past this point in male; pectoral fins i.i to 

 1.4 in head. 



Color of female plain olivaceous; scales on back and upper part of 

 sides with dark punctulations; no black spot on sides or on fins; a dark 

 area at base of anterior ray of anal, and a dark line from anal fin to base 



Fig. 7. Distal part of INTROMITTENT organ of Priapichthys daritnsis 

 (Meek & Hildebrand). (Greatly magnified.) 



of caudal. The male with a variable number (often as many as 20) of 

 narrow, dark cross-bars on sides; otherwise essentially as in females. 



There are over 100 specimens of this species in the present collection. 

 The largest female is 36 and the largest male 27 mm. in length. This 

 species was taken in the Rio Juan Diaz, Rio Bayano, and Rio Tuyra 

 basins. 



60. Priapichthys panamensis sp. nov. 



Type No. 8950, F. M. N. H.; length 24 mm.; Chame Point, 

 Panama. 



Head 3.55 to 4; depth 3.65 to 4.3; D. 8; A. 10; scales 29 to 31. 



Body moderately compressed; profile very gently convex from snout 

 to origin of dorsal; head broad, flat above; snout short, 3.75 to 4.5 in 

 head; eye 2.65 to 3.3; interorbital 1.75 to 2.4; mouth small, the cleft 



