V. ON APAREIODON, A NEW GENUS OF CHARACID 



FISHES.* 



By Carl H. Eigenmann. 



(Plates XI-XII.) 



Apareiodon^ is in all respects like Paradon except that there are 

 no teeth in the side of the lower jaw. The ampulla on the upturned 

 edge of the lower jaw, with which the teeth are associated in Paradon, 

 is less well-developed in this genus. 



Distribution. — Western Panama and Ecuador, Rio San Francisco, 

 La Plata. 



Type: Parodon piracicabce Eigenmann. 



Key to the Species of Apareiodon. 

 a. Mouth distinctly inferior. 



b. A dark streak along the lateral line and a second one above the first or 

 second row of scales above it. 



c. Head 5; lateral line 41 or 42; interorbital 3, or less than 3, in the 



length of the head i. piracicabce (Eigenmann). 



cc. Head 4.5; lateral line 35 or 36; interorbital 3 in the length of the 



head 2. itapicuruensis Eigenmann & Henn. 



bb. A dark streak along the lateral line and dark shades across the back, at 

 least in the adult. 



d. Lateral band continuous. 



e. Two teeth in the maxillary; lateral line 40-44; predorsal scales 

 12-14; eye 4 in the head, interorbital less than 3. 



3. ajjinis (Steindachner). 

 ee. One tooth in the maxillary; lateral line usuallj^ 37 (41 in one 

 specimen); predorsal scales 10-12, usually 11. 



4. hasemanni Eigenmann. 

 dd. Three broken stripes; dorsal and caudal lobes with cross-bands. 



5. dariensis Meek & Hildebrand. 

 ddd. Lateral band moniliform; one maxillary tooth; lateral line 37; pre- 

 dorsal scales 11-12 6. ecuadoriensis (Eigenmann & Henn). 



aa. Mouth terminal; a simple lateral band. . .7. terminalis (Eigenmann & Henn). 



I. Apareiodon piracicabae (Eigenmann). 



Parodon affinis Eigenmann & Norris (nan Steindachner), Revista Museu 

 Paulista, Vol. IV, 1900, p. 356. 



* Contribution from the Zoological Laboratory of Indiana University, No. 143. 

 ' a privative, iraptio. = the cheek. 656}V, = tooth; Apareiodon = without 

 teeth in the cheeks, or side of the mouth. 



71 



