THE AMERICAN TETRAGONOPTERINAE. 289 



Faint traces of lines following the scales. No humeral spot; a large dark 

 band extending from the tips of the three rays above the middle of the caudal 

 to their base, expanding on the caudal peduncle and downward and forward, 

 fading out above the origin of anal. 



Closely allied to A. maximus, differing from all other species in the oblique 

 band on the tail. 



43. AsTYANAX MAXIMUS (Steiudachner). 

 Plate 87, figs. 1-3. 



Tetragonopterus maximus Steindachner, Ichthyol. beitr., 1875, 4, p. 43, pi. 7 (TuUumayo; Monterico) ; 



1876, 6, p. 6 (syn.); Eigenmann & Eigenmann, Proc. U. S. N. M., 1891, 14, p. 54; Ulrey, Ann. 



N. Y. acad. sci., 1895, 8, p. 276; ?Perugia, Ann. Mus. civ. storia nat. Geneva, 1897, ser. 2, 18, p. 25 



(Alto Beni). 

 Aslyanax maximus ?Fowler, Proc. Acad. nat. sci. Phil., 1906, p. 342 (Peruvian Amazon); Eigenmann, 



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

 Tetragon-optertbs alosa GOnther, Ann. mag. nat. hi.st., 1876, ser. 4, 17, p. 399 (Monterico, Peru). 

 Tetragonopterus rutilus Stakks {non Jenyns), Proc. U. S. N. M., 1906, 30, p. 777 (Rio Peren6). 



Habitat. — Mountain streams of eastern Peru. 



Specimens examined. 



Catalogue Number of Size 



number specimens in mm. Locality Collector 



13762 1. 1 116 Yahuarmayo, Peru Purchase of Rosenberg 



Field Mus. 12 97-133 Moyobamba^ July, 1912 Osgood & Anderson 



I have examined one of the specimens inentioned by Fowler. It has the 

 origin of the dorsal equidistant from the snout and the caudal, and I am in doubt 

 whether it is A. maximus. It is very probably a form of A. fasciatus. 



Head 4.5; depth 2.5; D. 11; A. ^, ^; scales 7 or 8-38 to 40-6; eye 3.3 

 in the head, 1.5 in interorbital. Depth of caudal peduncle 2 in the head. 



Pectorals reaching ventrals or shorter, ventrals to anal or shorter. 



A large, obscvue, vertical humeral spot; faint dark stripes between two 

 rows of scales. A large caudal spot, abruptly narrowed and continued to the 

 end of the middle caudal rays; otherwise no oblique band above anal as in metae. 



44. AsTYANAX REGANi Meek. 

 Plate 61, fig. 3. 



Astyanax regani Meek, Field mus. Publications, 1909, 7, p. 207 (Las Cafias); Eigenmann, Rept. 



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

 Astyanax glohiceps Eigenmann, Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 432. 



Habitat. — Pacific slope of Panama, Costa Rica. 



