SUPPLEMENT. 



The following additions and corrections are chiefly necessitated by the acquisition 

 of fresh material during the progress of this work, and by the recent publication of 

 some papers by Dr. S. E. Meek on Central-American fishes. I am indebted to 

 Dr. Meek for kindly sending me proof-sheets of his latest memoir (Publ. Columbian 

 Mus., Zool. vii. 1907, pp. 133-157) ; in this he quotes, presumably from proofs, a 

 paper on the fishes of the Eio Motagua (Miller, Bull. Amer. Mus. Nat. Hist. 1907, 

 pp. 95-124) which I have not seen. 



ACHIRUS (p. 3). 



2 (a). Achirus fischeri, Steind., 1879. 

 Achirus fischeri, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1898, p. 2699. 



Depth of body nearly 2 in the length ; right pectoral fin represented by a single ray ; 60 to 62 scales in a 

 longitudinal series. 



Hal. Panama, Eio Mamoni. 



SICYDIUM (p. 10). 

 1 (a). Sicydium altum. 



Sicydium altum, Meek, Publ. Columbian Mus., Zool. vii. 1907, p. 149 '. 



Horizontal teeth of lower jaw mostly concealed. Scales extending forward on the upper surface of the head 

 nearly to the interorbital region ; abdomen scaly, except for a small area just behind the ventral fins ; 

 92 scales in a longitudinal series. Dorsal YI, I 10. Anal I 10. Dark olivaceous, without spots or 

 bars ; fins without spots or vermioulations, the anal with a dark edge. 



Bab. Costa Eica, Turrialba ^ and El Guayabo i. 

 Total length 105 mm. 



1 (b). Sicydium pittieri. 



Sicydium pittieri, Regan, Ann. Mag. Nat. Hist. (7) xix. 1907, p. 260'. 



Horizontal teeth of lower jaw concealed or not. Scales extending forward on the upper surface of the head 

 nearly to the interorbital region ; abdomen with a median naked area or strip ; 75 to 80 scales in a 

 longitudinal series. Dorsal VI, I 10. Anal I 10. A dark spot on each scale ; dorsal fins with dark 

 vermioulations ; anal with a dark edge. 



Hal/. Costa Eica, Eio Grande de Terraba i [Pittier). 



Here described from the types, two specimens (males), 120 and 135 mm. in total 



length. 



BIOL. CENTR.-AMER., Pisces, February 1908. 2 B 



