NO. 14S2. 



ARGENTINA FISHES— EVERMANN AND KENDALL. 



87 



Coniajo, Territory of Newquen, one from a tributary of Lake Traful, 

 two from a small tributary of the Limay, and the rest were without 

 label, ])ut were probably from one or another of these places. 



Proportional measurements of Pygidium areolatum. 



In the synonymy of this species, Berg- includes T. maculaitiSyGirard 

 (part), T. cardovensis Weyenbergh, and T. tetmis Weyenbergh. 



28. PYGIDIUM CORDOVENSIS (Weyenbergh). 



Trichomycterns cordovensis Weyenbergh, Act. Acad. Nac. Cien. Buenos Aires, 



III, Pt. I, 1877, p. 11, pi. Ill, figs. 1 and 2, "Rio Primero y acequias de 



Cordoba." 

 Trichomycterus tenuis Weyenbergh, Act. Acad. Nac. Cien. Buenos Aires, III, 



Pt. I, 1877, p. 12, pi. Ill, figs. A, B, C, "Laguna en la Sierra de Cordoba, 



cerca de la Villa Cruz-del-Eje." 

 Trichomycterus tenuis and Trichomycterus cordovensis, Eigenmann and Eigenmann, 



Occ. Pap. Cal. Ac. Sci., I, 1890, p. 326. 

 Pygidium areolatum. Berg, Anal. Mus. Nac. Buenos Aires, IX (2d ser., I), 



1895, p. 143 (Cordoba); in part. 



Berg- regards this species and P. tenuis (Weyenbergh) as specifically 

 identical with Pi areolatum (Cuvier and Valenciennes). Eigenmann 

 and Eigenmann list these two among others as "doubtful species of 

 Pygidium.'''^ They remark: ""As most of the 3'oung of the species of 

 Pygidimii are very much alike in coloration, and usualh' entirel}" dif- 

 ferent from the adult, we are compelled to place here most of the 

 species based on 3'oung individuals, unless they were collected together 

 with large individuals." 



We have 2 specimens easily referable to Pygidium tenuis; we 

 also have somewhat larger j^oung of P. areolatum, which are certainly 

 different from P. cordovensis according to the description of that 

 species by Weyenbergh. We can observe no essential differences 

 other than those that may be due to size between P. cordovensis and 

 P. tenuis as shown by the descriptions and figures. Tlie m.ost pro- 

 nounced difference is in the greater length of the barbels in P. cordo- 

 vensis. Disregarding this, P. te^iuls may be regarded as the young of 

 P. cordovensis. 



