DEC. 28, 1916. FISHES OF PANAMA MEEK AND HILDEBRAND. 275 



with comparatively few dusky points, those above base of anal more or 

 less regularly arranged in the form of several V's with the apex pointed 

 backward. Fins with dusky points, those on the anal fin mostly 

 arranged in a single series and on the anterior margin of the rays, few 

 or none on the interradial membranes. 



Of this species there are over 200 specimens in the present collection, 

 ranging in length from 25 to 40 mm. It is found along with Pseudo- 

 cheirodon affinis, but is apparently less numerous. 



Habitat: Both slopes of Panama. 



20. Pseudocheirodon gen. nov. 



Type Pseudocheirodon affinis sp. nov. 



Minute fishes ranging in length from 25 to 60 mm. Body elongate, 

 compressed; the back elevated; head small; second suborbital covering 

 nearly the entire cheek; teeth in each jaw in a single series, expanded at 

 tips, their cutting margins transverse or slightly rounded; 2 or 3 teeth 

 on maxillary; lateral line incomplete, present on from 5 to 20 scales; 

 scales thin, with radiating striae; origin of dorsal about equidistant from 

 tip of snout and base of caudal; adipose fin well developed; base of 

 caudal with normal scales; origin of anal under posterior rays of dorsal, 

 anteriorly with a single row of scales at base; interhsemal spines of the 

 caudal peduncle not projecting; air bladder large, its walls thin; a con- 

 spicuous caudal spot usually present. 



This genus is closely allied to Cheirodon on the one hand and to 

 Odontostilbe on the other hand. From the former it differs in the 

 absence of the protruding interheemal spines on caudal peduncle and 

 from the latter in the incomplete lateral line. From Contpsura it 

 differs in having the scaling on the base of the caudal in the male 

 normal. 



26. Pseudocheirodon affinis sp. nov. 



Cheirodon insignis (non Steindachner) Evermann & Goldsborough, Proc. 



Biol. Soc. Wash., XXII, 1909, 98, fig. 2 (Tabernilla, Atlantic slope, 



Panama Canal Zone). 

 Cheirodon insignis Eigenmann, Memoir. Carnegie Mus., VII, 1916, 69 



(in part). 



Type No. 8941, F. M. N. H.; length 38 mm.; Rio Gatun, Monte 

 Liria, Canal Zone. 



Head 3.8 to 4.5; depth 2.2 to 2.9; D. 10 or n; A. 21 to 24 (rarely 

 with only 20 rays); scales 31 to 33. 



Body rather short, compressed; profile straight over eyes, elevated at 

 nape; head small; snout blunt, 4 to 4.5 in head; eye 2.6 to 3; interorbital 



