eigenmann: fresh water fishes. 277 



Habitat : Chili to Punta Arenas and Rio Chico. 



Twenty-four specimens, ranging from 49-96 mm., were collected by 

 Hatcher in the Rio Chico, 15 miles below Rio Belgrano, and eight be- 

 tween 48 and 1 13 mm. near Punta Arenas. The oldest specimen is finely 

 mottled with irregular light cross streaks. The light becomes more marked 

 in the specimen 90 mm. long. Of two specimens 87 mm. long one is 

 colored like the largest, the other has dark blotches and cross streaks on 

 a yellow background. With a decrease in the size there is an irregular 

 decrease in the amount of pigment which is in cross streaks and irregular 

 blotches. 



Family VI. APLOCHITONID^E. 



HaplocJiitonidcc Gunther, Cat. Fish. Brit. Mus. V, 381, 1864. 



The family is composed of two genera, the naked ApIocJiitoii with two 

 species in Chili and Patagonia, and the scaled Prototroctes with three 

 species in New Zealand, Queensland and South Australia. 



The species of Aplochiton have also received detailed consideration 

 from Smrtt. 



10. APLOCHITON Jenyns. 



Aptoc/iitou ]&nyns, Voy. Beagle, Fishes, 131, 18. 



FarioncIIa Cuvier & Valenciennes, Hist. Nat. Poiss. XXII, 507. 



Haplochiton Gunther, Cat. Fish. Brit. Mus. V, 381, 1864. 



Species of Aplochiton. 

 a. D. 12-13 ; ^- 15-16. 



b. Head 22.5-25.9 percent, of the length ; width of head 1 1.3-12.4 per cent. ; olivaceous, 

 darker above, a series of narrow dark cross bars. 19. zebra. 



from tip of snout to origin of dorsal about 1 .46 in length without caudal ; height of anal about 

 8.46 in same length, its base about 2.20 in head, the tips of first rays not reaching tips of last 

 when depressed ; distance from tip of snout to anal origin about 1.32 in the length without caudal ; 

 pectoral short, rounded; ventral very short, about 2.5 in head, the distance from its origin to 

 base of pectoral about 3.35 in length without caudal, and distance from its origin to point of anal 

 about 5.25 in same length ; caudal deeply emarginate. 



Color, very pale gray, slightly more dusky on back from thick minute punctulations ; irregular 

 groups of black dots on side extending not quite to belly, giving a clouded effect and the appear- 

 ance of broken and entire crossbars ; belly pale, with very few dots in front of ventral ; a row of 

 black dots from base of each ventral to each side of vent ; fins pale, with some punctulations, head 

 thickly punctulated above, on snout, and on side about to level of upper jaw, abruptly pale below. 



Type. — A specimen 5.62 inches long, collected December 1 3, 1903, by Mr. John W. Titcomb, 

 from Rio Traful near Lake Traful, Argentina. 



