

Eigenmann: Collection of Fishes from Paraguay. 137 



65. Astyanax bimaculatus lineatus Perugia. 



Many specimens, Ascuncion (281) ; Corumba (344, 368) ; Bahia 

 Negra (380) ; Puerto Max (388, 389, 393) Sapucay (456). 



Steindachner states that bimaculatus (maculatus) varies in the shape 

 of the body, with age and sex, and with the habitat in rapid clear 

 waters or in stagnant water. 



Variation in depth, anal rays and scales of bimaculatus recorded by : 



Length Depth A. Scales 



1. Giinther 31-34 7~39-7-5- 



2. Steindachner, 



^trTzir \ ? 4*=5 in '' eS W \ 32-33 7-5 or 8. 5 - 3 5 or 3 6-6 to 7.5. 

 ( $ A X A " 2.33-2.4) 



3. Steindachner, 



Cauca & Magdalena 2.1-2.5 32-39 7.5 or 8-35 to 36-7. 



4. Ltitken {lacustris) 2 24-32 5 to --34 to 36-4^. 

 Rio Grande do Sul 27 7-39-5. 



Sixty-five specimens from the basin of the Paraguay have the fol- 

 lowing rays, counting the rudimentary ones : 



Two have 27, one has 28, four have 29, thirty-two have 30, 

 eighteen have 31, five have 32 and three have 33. 



The specimens from the Paraguay system have usually a small 

 accumulation of pigment cells at the tips of the scales which form 

 horizontal series. It is probable that such a specimen has served 

 Perugia for his type of lineatus. Perugia's specimen had 28 anal rays 

 with nothing said as to whether or not the rudimentary rays were 

 counted. It is seen above that some specimens have 28, not counting 

 the rudimentary rays, so that his specimens fall within the limits of 

 bimaculatus whether he counted these rays or not. The most impor- 

 tant difference is in the number of scales in the lateral line, which, 

 according to Perugia, is 34, whereas the specimens examined by us 

 from the basin of the Paraguay have the scales 36-40 in the following 

 ratio: twelve have 36, twenty have 37, seventeen have 38, eight have 

 39 and one has 40. 



There are no other differences and I have little doubt that Perugia's 

 li?ieatus is identical with bimaculatus. If it is desirable to distinguish 

 the differences which the Paraguayan specimens show they may be 

 termed Astyanax bimaculatus lineatus. 



66. Astyanax fasciatus (Cuvier). 



P. scabripinnis Eigenmann & Kennedy, 1. c, 521. 



