eigenmann: the cheirodontin^. 53 



Farbung zeigt der grosse runde Fleck auf der Dorsale. Langs der mittleren 

 horizontalen Schuppenreihe des Rumpfes liefen bis zum Beginn der Caudale 33 

 Schuppen. 



"D. 11. A. 30. L. lat. 33. L. tr. 6/1/3M. 



"Das grosste der von uns untersuchten Exemplare ist 30 mm. lang (mit 

 EinscWuss der Caudale). 



"Fundort: Amazonenstrom bei Villa Bella und Obidos." 



The lengths of the pectoral and ventrals, the shape of the anal, and the color 

 make it very probable that eques, which I have not been able to examine in the new 

 light of these studies, belongs to this genus. 



26. Megalamphodus melanotus (Eigenmann) . 

 Aphyocharax melanotus Eigenmann, Mem. Carnegie Mus., Vol. V, 1912, p. 312 



(Rockstone on the Essequibo River, British Guiana). 



This species is known only from the specimens originally described. 



1877a, C. M. Type, 43 mm. Rockstone sand-bank. Eigenmann. 



Head 4; depth 3.8; D. 10; A. 25; scales 5-33-2, six with pores. Eye 2.75 in 

 head, interorbital 3.75. 



Compressed, preventral and predorsal areas rounded, the latter with a median 

 series of ten scales. 



Frontal fontanel not entirely separating the f rentals; second suborbital in 

 contact with the preopercle below, a very narrow naked area behind it. 



Mouth large, the antero-posterior extent of the premaxillary very short; the 

 maxillary large, with a curved anterior margin, its length about equal to that of 

 the eye; about twelve teeth in each premaxillary; maxillary with about four 

 similar teeth; about twenty teeth on each side of the lower jaw. 



Origin of dorsal a little nearer snout than caudal; origin of anal under end of 

 dorsal; ventrals not quite reaching anal, pectorals not quite to ventrals. Scales 

 with a few divergent striae. Pseudotympanum faintly evident on one side. Four 

 chromatophores, tip of anterior dorsal rays dark. 



27. Megalamphodus heteresthes (Ulrey). 

 Aphyocharax heteresthes Ulrey, Ann. N. Y. Acad. Sci., Vol. VIII, 1895, p. 293 



(Brazil); Eigenmann, Report Princeton Univ. Exped. Patagonia, Vol. Ill, 



1910, p. 429. 



Range : Brazil, definite localities not known. 



Head 3.33; depth 3; D. 11; A. 27-30; scales about thirty-one. Eye twice 

 the length of the snout, 3.5 in the head. 



