XXU ADDENDA AND CORRIGENDA CHEIRONDONTIN^E. 



on 4-8 scales only. Dorsal 10; origin equidistant from gill-opening and base of 

 caudal, above the anterior part of the anal. Anal 34-38; origin equidistant from 

 anterior part of eye and base of caudal; anterior rays the longest, about .6 the 

 length of head; free edge straight or slightly concave. Pectoral extending to or a 

 little beyond the base of ventral. Caudal forked. A lateral band (blackish in 

 preserved specimens) from the lower part of eye to the lower lobe of caudal. An 

 oblique dark stripe on the dorsal; anal with a dark margin. 



"Habitat, Arroyo Yaca, Estacion Cabellero, Paraguay. 



"Several specimens, the largest 40 mm. in total length, collected by Dr. A. 

 Barbero." 



Chirodon arnoldi Boulenger, Ann. and Mag. Nat. Hist. (6), Chirodon arnoldi 

 Boulenger, Ann. and Mag. Nat. Hist. (8), IV, p. 497. 



This species described as a Cheirodon is probably a Hemigrammus. If it is a 

 Cheirodon and if it comes from the northern part of the Isthmus of Tehuantepec, 

 it extends the known range of the genus Cheirodon northward for more than ten 

 degrees latitude. 



Head 4; depth 3. D. II. 9: A. III. 19; scales 32, 4 or 5 with pores, 11 scales in a 

 transverse series. 



Strongly compressed, snout shorter than eye, eye 2.66 in head, equals inter- 

 orbital; maxillary not reaching anterior border of eye; lower jaw scarcely projecting. 

 Origin of dorsal just behind base of ventrals, equidistant from snout and caudal 

 longest ray of dorsal as long as head. 



Yellowish above, finely speckled with black, silvery white beneath; a large 

 round black spot on caudal peduncle, extending on base of middle rays of caudal; 

 dorsal, ventrals, and caudal tinged with orange. 



Length 33 mm. Said to have been imported by the Aquariest Arnold of Ham- 

 burg from Puerto Mexico, on the north coast of the Isthmus of Tehuantepec. 



