THE AMERICAN TETRAGONOPTERINAE. 227 



teeth, the front four or five on each side being much larger than any of those of 

 the upper jaw, the fourth tooth from in front being usually, though not always, 

 somewhat the largest. Dorsal behind ventrals. Lateral line interrupted. 

 Species with numerous longitudinal stripes. 



Very similar to Hollandichthys. 



Habitat. — Western Ecuador. 



PsEUDOCHALCEUS LiNEATUS Kner. 



Plate 64, figs. $ and 5. 



Pseudochalceus lineatus Kner, Sitzungsb. Akad. wiss. Munchen, 1863, p. 225; Kjsier & Steindachneb, 

 Abhandl. Bayer, akad. wiss., 1864, 10, p. 35, pi. 5, fig. 1 (Western slopes of Ecuador); Eigenmann, 

 Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 432. 



This species is known only from the types in the K. K. naturhistorisches 

 Hofmuseum, Vienna, from which the generic description has been drawn. 

 Wagner (Abhandl. Bayer, akad. wiss., 1864, 10, p. 98) states that it occurs only 

 at about 1000 feet elevation. 



Head 3.5; depth 2.8-3; D. 10 or 11; A. 25 or 26; scales 36; eye 4 in the 

 head, equal to snout, slightly less than interorbital. 



Second suborbital covering nearly the entire cheek; origin of anal below 

 end of dorsal; scales with 12-14 striae; lateral line developed on 6-8 scales; 

 brownish, with darker stripes between rows of scales. 



14. AsTYANAX Baird and Girard. 



Aa-Tu-ai'ai, o, lord of the city. In Homer Astyanax, son of Hector. 



Tetragonopteriis in part by authors generally. 



Astyanax Baird & Gir.4.rd, Proc. Acad. nat. sci. Phil., 1854, 7, p. 26; U. S. & Mex. bound, surv., 1859, 



p. 74; Eigenmann, Ann. Carnegie mus., 1907, 4, p. 127 (argentatus) . 

 Poecilurichihys Gill, Ann. Lye. nat. hist. N. Y., 1858, 6, p. 54 (hrevoortii) } 

 Zj/jo^oster Eigenmann, Indiana univ. studies, 1913, no. 18, p. 23 (filiferus).^ 



Type. — Astyanax argentatus Baird & Girard. 



Small, compressed fishes, more or less elongate, rarely reaching a length of 

 150 mm., usually much smaller, but in one instance, A. maximus, reaching 200 

 mm. in length. 



Premaxillary with two series of teeth, the first series with several teeth; 



' woUiKla, variegated, ovpa, tail, ixSvs, i>, fish. 

 - iv^op, t6, a yoke, yaarrip, r/, the beUy. 



