l86 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



from its habit of frequenting reeds. It is common over the whole of the 

 great plains, which compose the eastern side of the southern part of 

 America. According to Azara, it extends northward as far as latitude 30°, 

 and to the south, I have reasons to believe, from accounts I have received, 

 that it is found near the Strait of Magellan, which would give it a range 

 of nearly 1400 miles, in a north and south line. One of my specimens 

 was obtained in 50° south, at Santa Cruz : it was met with in a valley, 

 where a few thickets were growing. When disturbed, it did not run away, 

 but drew itself up, and hissed. My other specimen was half-grown, and 

 was killed in the end of August, at Bahia Blanca." 



Order CHIROPTERA. 



Family VESPERTILIONID^. 



While Bats in great variety reach Paraguay and northern Argentina, 

 representing at least ten genera and about twenty species, only four species 

 appear to have been authentically recorded from Patagonia south of the 

 Rio Negro. None of these is represented by specimens in the collections 

 made by the Princeton Patagonia Expeditions. Mr. Brown reports see- 

 ing a skin of a large bat in the possession of a ranchman, as noted below, 

 which, from his account of it, was apparently Histiotits velatus. All of the 

 bats reported from southern Patagonia belong to the family Vespertilioni- 

 dae, and to genera that reach, also, the highest latitudes attained by bats 

 in the northern hemisphere. 



Genus MYOTIS Kaup. 

 Myotis ciiiloensis (Waterhouse). 



Vespertilio ciiiloensis Waterhouse, Zool. Voy. Beagle, Mamm., 1839,5, pi. 



iii, animal. Island of Chiloe, Chili. — Wagner, Schreber's Saug. 



Suppl., I, 1840, 536 (from Waterhouse); V, 1855, 753. — Dobson, 



Cat. Chirop., 1878, 322. — Lataste, Act. Soc. scien. du Chili, I, 



1892, 79. 

 Myotis ciiiloensis Lahille, Congr. cient. Lat. Amer., Ill, 1899, 174. 

 Not Vespertilio ciiiloensis P. Gervais. 



This species was described from a specimen obtained on one of the 

 islets on the eastern side of the island of Chiloe, as stated by Darwin (in 



