1906.] 



NATURAL SCIENCES OF PHILADELPHIA. 



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IV, 6 + 11, IV, pointed, longest | of filaments which are f of orbit. 

 Each scale with several fine striae. Color in alcohol brownish, sides 

 brassy or silvered. Back a little darker than other portions. Fins all 

 brownish, dorsal and caudal a little darker. A large blackish blotch, 

 a little larger than iris, at base of caudal and extending out on middle 

 caudal rays. An indistinct grayish humeral blotch. Iris brownish, a 

 little darker above. Length 6| inches (caudal damaged). Type. 



Other example shows: Head 3^; depth 3^; D. ii, 9; A. iv, 25, i; 

 scales about 55 in lateral line to base of caudal, and 4 more on latter; 

 snout 3f ; eye 4; maxillary If; interorbital space 4^. 

 Acestrorhynchus abbreviatus (Cope). Fig. 49. 



Xiphorhamphus abbreviatus Cope, Proc Amer. Philos. Soc. Pliila., XVII, 

 1877-78 (May 17, 1878), p. 687. Cotypes, Nos. 21,532 (type), 21,105 to 

 21,107, and 21,982 and 21,983, A. N. S. P. Peruvian Amazon. Prof. J. 

 Or ton. 



Width of head 2^ in its length; interorbital space S^. Body well 

 compressed, and edges of body rounded except thorax, which has a 



Fig. 49. — Acestrorhynchus abbreviatus (Cope). 



large median keel. Postdorsal region, and both upper and lower 

 surfaces of caudal peduncle, somewhat flattened and level. Head 

 compressed. Snout a trifle longer than wide. Teeth in jaws rather 

 irregular canines, about 6 well developed in upper and 8 in lower. 

 Other teeth small, those on rami of mandible posteriorly fine, and 

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