THE GYMNOTID EELS OF TROPICAL AMERICA. 135 



3166 C. M., one, 90 mm. Cacequy, Jan. 31, 1909, Haseman. 



3167 C. M., two, 75-80 mm. Rio Boa Ventura, June 16, 1909, Haseman. 



3168 C. M., two, 65-120 mm. Villa Hays, Paraguay, April 13, 1909, Haseman. 



3169 C. M., one, 120 mm. Rio Mamore, Sept. 19, 1909, Haseman. 

 4894 I. U. M., eighteen, 75-140 mm. Rio Grande do Sul. 



3170 C. M., one, 80 mm. Puerto Suarez, Sept. 19, 1909, Haseman. 



1792 C. M., 12615 I. U. M., four, 57-165 mm. Mud Creek, Aruka, Shideler. 



1793 C. M., 12616 I. U. M., two, 100-165 mm. Chipoo Creek, Shideler. 



1794 C. M., 12617 I. U. M., two, 95-105 mm. Pacopoo Pan, Wm. Grant. 



1795 C. M., 12618 I. U. M., four, 118-160 mm. Nickaparoo Creek, Wm. 

 Grant. 



1796 C. M., one (broken), 80 mm. Savannah Landing, Eigenmann. 



12635 I. U. M., one, 95 mm. Creek below Savannah Landing, Eigenmann. 



1797 C. M., one, 117 mm. Twoca Pan, Rupununi, Wm. Grant. 



1798 C. M., one, 70 mm. Kumaka, Eigenmann. 



Head 8.25 to 9.25, greatest depth 7 to 9 in the length to the end of the anal; 

 anal rays 220 to 260; snout 3.3 to 3.7, interorbital about 3 in the head; eye 2.5 in 

 the interorbital, 2.5 to 3 in the snout, and about 6 in the head. 



Body rather cylindrical, though slightly compressed caudad; head chubby, 

 somewhat conic; width of head 2 to 2.5, depth of head in occipital region about 

 1.75 in greatest depth; anus twice the diameter of the eye behind the vertical 

 from the eye; dorsal profile of the head distinctly slanting, of the body weakly 

 convex; ventral profile regularly convex. 



Snout short and truncate; mouth small; gape very short; eyes moderately 

 small; jaws equal. 



Caudal peduncle 4.5 to 5 in the total length; pectorals 1.5 to 2 in the head; 

 origin of the anal about the length of the snout behind the origin of the pectorals. 



Ground-color buff, overlaid with chocolate-brown; dorsal parts dark; ventral 

 lighter; numerous bands of dark brown crossing the body but not the anal; lateral 

 line buff; head dark; fins bluish white to hyaline; rays more or less black. 



Distribution: Rio Magdalena, Guianas, Amazons south to Rio de la Plata. 



10. Hypopomus artedi (Kaup). 



Seba, Thesaur., HI, tab. 32, fig. 2. 



Rhaynphichthys artedi Kaup, Apod., 128, 1856 (Mona); GtJNTHER, Cat., VIII, 



6, 1870. 

 BrachyrJuwiphichthys artedi Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., 



XIV, 1891, 62. 

 Rha^nphichthys miilleri Kaup, Apod., 129, 1856 (French Guiana); GtJNTHER, Cat., 



VIII, 6, 1870. 

 Hypopomus miilleri Gill, Proc. Acad. Nat. Sci. Phila., 1864, 152. 



