_— 
Ls ae en ee Ce 
Marcu, 1914. List or Fisnes oF Costa Rica — MEEK. III 
dd. 
bb. 
scales; bones of the lower jaw firmly united; teeth conical or 
villiform. Alfaro. 
Lower edge of caudal peduncle rounded, or obtuse, with a median 
series of scales. 
Ventral fins similar in both sexes; first produced ray of anal fin 
of male without long processes or appendages. 
Anal fin of male short, ending in a small retrorse hook formed by 
second and third produced rays; teeth conical or villiform, not 
movable. Brachyrhaphus. 
. Anal fin of male ending in a more or less distinct antrorse hook; 
the anterior branch of the second produced ray curved forward. 
Mouth moderate, with distinct lateral cleft; teeth conical or 
viliform, not movable. 
Dorsal rays 7 to 12; origin of dorsal behind that of anal; extremity 
of anal fin of male supported equally by third and anterior 
branch of second produced rays. Priapichthys. 
Dorsal rays 11 to 17; origin of dorsal in advance of that of anal; 
extremity of male anal fin a strong hook and formed by the 
unsegmented end of the anterior branch of the second ray. 
Pseudoxiphophorus. 
Mouth small, transverse; teeth oar-shaped, movable; extremity 
of anal fin of male supported equally by first and anterior branch 
of second produced rays; first ray not serrated. Peciliopsts. 
Ventral fins enlarged in the males, the second ray longest; first 
prolonged anal ray bearing a small antrorse spine at or near its 
end; last bearing a pair of processes directed outwards and 
towards the base of the fin. Mollientsia. 
The following is a key to the species Pectline listed here and is 
based mostly on characters of the females: 
a. 
b. 
bb. 
me 
d. 
dd. 
Dentary bones firmly united; teeth not movable; alimentary 
canal shorter than the body. 
Lower edge of caudal peduncle sharp, without a median series of 
scales. Alfaro cultratum. 
Lower edge of caudal peduncle rounded or obtuse, with a median 
row of scales. 
Origin of dorsal well behind that of anal. 
No caudal spot; middle half of sides with 5 to 8 narrow vertical 
lines; D. 7. A. 9 or Io. Priapichthys turrubarensis. 
A prominent caudal spot; no dark bars on sides; D. 7 or 8; A. 
8 or 9. Priapichthys parismina. 
