146 Annals of the Carnegie Museum. 



D. XVI, 6-XV, 7 j A. Ill, 6-1II, 7 ; head 3 ; depth 2%. 



The lateral line ascends rapidly ; tubes are variously developed, rang- 

 ing from 5-10 on the anterior part of the lateral line ; behind the tubes 

 the scales contain inconspicuous pores only, which are on the row of 

 scales next to the dorsal for a distance, but further back they shift 

 down on the sides to the next row of scales. On the posterior section 

 of the lateral line tubes are variously developed from none at all to 3 

 next to the caudal, the remainder of the line being represented by 

 pores. 



10 1. Heterogramma corumbce Eigenmann & Ward sp. nov. (Plate 



XLV, Fig. 3). 



Type No. 10 166, one specimen, 30 mm., Corumba (303). 



Cotypes No. 10 167, nine specimens, 22-35 mm -> Corumba. (312, 

 part of 315, part of 318, part of 324.) 



Two specimens, 27 and 37 mm. from a forest laguna (392), near 

 Puerto Max in water saturated with calcium (gypsum?). 



The cotypes were evidently associated with Biotodoma fascialus, 

 inasmuch as they were mixed with specimens of the latter under the 

 same collector's number. The species which they represent, if dif- 

 ferent from trifasciatus, is in shape and fin-formula very similar to 

 that species. In color, in which they all agree, they differ very 

 strikingly from trifasciatus. There is the same streak from the eye 

 down and back, a similar dusky area along the base of the dorsal and 

 the same lateral band, but the edges of the latter tend much more 

 frequently to become jagged than in trifasciatus and the caudal spot 

 is much larger and more intense than in the latter species ; the most 

 striking difference comes below the lateral band. Here there are two 

 or three more or less interrupted lines following the series of scales and 

 parallel with the lateral band ; faint cross bands extend along the 

 entire sides ; ventrals as in trifasciatus with a large black spot or streak ; 

 anal and soft dorsal more or less barred ; caudal distinctly crossbarred. 



Head 3 ; depth 2^ ; D. XVI, 6 ; A. Ill, 6-7 j lat. I.9-11 -f 0-8 ; 

 22 scales along median line. 



Eye large, ^ in snout, 3 in head ; scales large ; the lateral line 

 very poorly developed, the number of developed tubes varying greatly, 

 both in the anterior and posterior portions. Pectorals reaching to 

 vent ; ventral to anal ; anal and dorsal to caudal. 



102. Hete7'ogramma borel/i Regan . 



Six specimens from Corumba (part of 312 and 324). 



