﻿20 



IXDIAXA UNIVEESITT STUDIES 



PARASTREMMA gen. nov. 



A genus of the Rlioadsinae. General features of Astyanax. 



Premaxillary with an outer series of two conical teeth, the seven to 

 nine denticles of each tooth of the inner series of about equal size ; max- 

 illary with two similar serrate teeth and about fifteen conical teeth scat- 

 tered along its entire margin : dentary with about six teeth similar to 

 those of the inner premaxillary series, the outermost one much smaller 

 followed on sides by six canines of which the first and last are small, the 

 other four very large, recurved, on the elevated margin of the dentary. 

 Lateral line complete; adipose fin well developed; origin of dorsal near 

 middle of body. 



21. Parastremma sadina sp. nov. 

 Description of the type. 



Head 4.6; depth about 2.5; D. 11; A. 30; scales 11-61-10; eye 1 in 

 snout, 3.5 in Jiead. a little less than 2 in the interorbital. 



Compressed ; dorsal and ventral profiles equally arched, ventral and 

 dorsal areas rounded ; predorsal line in part naked, predorsal scales about 

 20. Head subcouical, snout blunt, extending slightly beyond mouth ; skull 

 arched in cross section ; frontal fontanel short, triangular, about twice 

 as long as its width ; occipital process bordered by about 5 scales on each 

 side, extending about one-sixth the distance from its base to the dorsal ; 

 cheek triangular, entirely covered by the third suborbital ; preopercle pro- 

 longed, rounded below; mouth large, maxillary-premaxillary border angu- 

 late. as long as snout and eye; maxillary slender, extending to or beyond 

 suture between second and third suborbital. Dentition as described for the 

 genus. 



Gill-arches short. 0 + 8 rakers, the longest raker 4 in the eye. 



Origin or dorsal midway between snout and caudal, the fin pointed, 

 extending to midway between its end and middle of the adipose fin. 

 Caudal lobes about 4 in the length : anal long, its origin on a vertical from 

 the last dorsal ray, its second to sixth rays forming a slight lobe, thence 

 graduated ; ventrals not reaching anal ; pectorals narrow, not reaching 

 ventrals. 



Scales cycloid, with few diverging striae ; upper part of sides with 

 scales regularly imbricate, below lateral line slightly less so ; caudal naked ; 

 a series of very small scales along base of anal anteriorly ; a large axillary 

 scale ; lateral line straight and complete. 



A large subcircular spot on caudal peduncle ; double humeral spots, 

 vertically elongate, one across third and fourth, the other across tenth and 

 eleventh scales of the lateral line ; fins without black markings. 



Type, 136 mm.. Istmina. CM. No. 4812. 



Paratypes, twenty-two specimens, Istmina, CM, Xo. 4813 a-e; I.U.M. 

 No. 12675 a-f. 



This species is locally known as "Sadina." 



