THE AMERICAN TETRAGONOPTERINAE. 



259 



Specimens examined. 



These specimens agreeing with the Rio San Francisco specimens in the 

 anal rays and number of fin rays differ in having a black lateral stripe replacing 

 the silvery band. The dark in the axils of the scales is also more conspicuous. 



21. AsTYANAX (PoECiLURiCHTHYs) JANEiROENSis Eigenmann. 



Plate 42, fig. 1. 



Astyanax janeiroensis Eigenmann, Bull. M. C. Z., 1908, 52, p. 96; Rept. Princeton univ. e.xped. Pata- 

 gonia, 1910, 3, p. 433. 



One specimen. 21057 Type. 92 mm. Rio de Janeiro. Thayer Expedition. 



This species is closely related to A. bimaculatus. It differs conspicuously 

 from typical specimens of A. bimaculatus from Rio de Janeiro in its much more 

 elongate form. 



Head 4; depth 2j; D. 11; A. 26; scales 6-38-5; eye 3.5; interorbital 2|; 

 two maxillary teeth; denticles of the second series of premaxillary teeth in a 

 crescent. 



Pectorals not quite reaching ventrals, base of anal equals the space between 

 the dorsals. 



Width of body 2j\ in the depth (3-3.4 in all specimens of A. bimaculatus 

 from Rio de Janeiro); predorsal line entu-ely scaled, with an almost complete 

 series of median scales. 



A faint basal caudal spot not continued on the middle rays in the type 

 which is very much bleached. 



The following specimens - differ from the type of A . janeiroensis in having 



» A. 24 in 3, 25 in 4, 26 in 3; L. 1. 32 in one, 33 in 2, 34 in 3, 35 in 4. 



^ Catalogue Number of Size 



number specimens in mm. Locality Collector 



3288 8 83-119 Iguape Haseman 



3289 6 39-110 Agua Quente Haseman 



3290 2 71-105 Iporanga Haseman 



3291 1 106 Morretes, Parani Haseman 



