PACIFIC SLOPE OF ECUADOR, PERU AND CHILI. 519 



ill the bottom of the Rio Rahue at Osorno. Geotria australis occurs 

 in Australia as well as in Chili. 



Velasia chilensis is very rare, and as far as known, is limited to 

 Chili. 



Velasia stcnostomus is found in New Zealand as well as in 

 Chili. 



One species of the genus Caragola, C. lapicida, and two species 

 of Mordacia, M. acittidcns and M. Anzvandteri, occur in the 

 streams of Chili. They are much smaller than Velasia and Geotria. 

 The genus Mordacia is also found in Australia. 



Of catfishes, there are two families. The Diplomystidae are 

 represented by Diplomyste Chilensis and are confined to Chili and 

 Patagonia. They are distinguished by the functional maxillary, a 

 bone rudimentary in most other catfishes, but in this species bear- 

 ing teeth. 



The Pygidiid?e confined to South America, but within it found 

 everywhere from the sea to Lake Titicaca, and from Panama to* 

 Patagonia, are represented by three genera. 



Nematogenys, the " bagre " of the Santiago market, is confined 

 to Chili. It reaches a considerable size. It seems to be at its best 

 in the Maipo basin, but occurs as far south as Lautaro. It is 

 probably nearer the original of this family than any other living 

 species. 



Pygidium areolatum is found everywhere south of Choapa. Its 

 relative P. Chiltoni is more restricted in its distribution. The genus 

 is found in all mountain streams from 300 feet to 12,000 south of 

 Panama. 



Hatcheria, as far as known, is confined to Chili and northern 

 Patagonia; one species occurs between the Bio Bio and Lautaro. 



Cheirodon pisciculiis is a small fish belonging to a genus widely 

 distributed between Panama and Rio Grande do Sul and the La 

 Plata basin. It lives in weedy stretches of quiet water. It occurs 

 from \^allenar south at least to Puerto Montt, wherever conditions 

 are favorable. The northernmost range of the genus is much nearer 

 the equator than Vallenar. Its known southernmost range, 41° 

 18', is much farther from the equator than the farthest north for 

 any of the family of Characins to which it belongs. It has under- 



