1914.] NATURAL SCIENCES OF PHILADELPHIA. 19 



an open cultivated valley-head, draining the south slopes of Mount 

 Pichincha, about 8 miles south of Quito and at an elevation of 

 about 10,500 feet, the valley at this point being about half a mile 

 wide and extending to even greater widths as far as one can see, in a 

 southerly direction." (S. N. Rhoads.) 



