eigenmann: the cheirodontin^. 19 



the maxillary oblique, about equal to length of eye; seven to nine teeth in the pre- 

 maxillary, nine or ten teeth in the maxillary, about thirteen to sixteen teeth on 

 the dentary; tooth-bearing portion of dentary over half the length of the lower jaw. 



Origin of dorsal about equidistant from preopercle and base of middle caudal 

 rays; margin of dorsal rounded, the fifth ray highest, httle if any longer than post- 

 orbital portion of head; caudal but feebly forked, its lobes short, about equal to 

 'ength of head less snout; origin of anal under posterior part of dorsal; base of 

 anal half as long as head, or a little 'onger; marg'n of anal nearly straight or 

 rounded in front, without lobe, the fifth ray highest; ventrals nearly reaching 

 anal, or a little beyond the base of the first ray; pectorals broad, reaching half-way 

 to middle of ventrals; origin of ventrals in middle, or a httle behind the middle of 

 the distance from snout to caudal. 



Scales of middle of s'des large, decreasing rapidly towards the back and belly. 

 No scales on base of anal or caudal. 



Sides reticulated with dark, basal angles of scales very dark; upper parts of 

 head and naked predorsal area blackish, an obscure humeral spot over and some- 

 times on the second and third scales of the lateral line; no caudal spot, a faint dusky 



lateral band. 



Genus II. Spintherobolus Eigenmann.^ 



Spintherobol'us Eigenmann, Ann.- Carnegie Mus., Vol. VIII, 1911, p. 167, PL V, 

 figs. 1-4. 



Type: Spintherobolus papilliferus 'Eigenmann. 



Teeth tricuspid, in a single series in dentary, premaxillary, and upper part of 

 maxillary; no adipose fin; lateral line on one or two scales; caudal naked; anal 

 very short, naked; tactile papillae excessively developed; suborbitals very feeble; 

 predorsal area fully scaled. 



2. Spintherobolus papilliferus Eigenmann. (Plate III, figs. 1-4.) 

 Spintherobolus papilliferus Eigenmann, I. c. 

 Range : Upper Tiete basin. 

 3882, C. M., type 41 mm. 3883, C. M., paratypes, four. 25-39 mm. Alto 



da Serra, Tiete basin, Sao Paulo, Aug. 4, 1908. Haseman. 

 Head 3.33; depth 3; D. 11; A. 12; scales 35, 13 between dorsal and ventral; 

 eye 4.3; interorbital 3.5 in the head. 



Cyprinodontiform; profile sloping rapidly to above the ventrals; caudal 

 peduncle a trifle less than half the greatest depth, length of the peduncle twice its 



8 (Tiri!'9ijpo/3oXos, emitting sparks, referring to the appearance of the yellow tactile organs of the head. 



