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NORTH AMERICAN FAUNA. 



leaving San Bias and again upon reacliing the islands. It was evident 

 that the sea lions had been hunted for sport by previous visitors until 

 they had become comparatively scarce and are now in a fair way to 

 become extinct. After learning the location of the most frequented 

 places on both islands, we visited them under the guidance of a tortoise- 

 shell hunter who was very familiar Avith the shore, but we saw only a 

 single sea lion. It was on a rocky islet oft' the shore of Maria Oleofa, 

 and took to the water and disappeared before we could get a shot. 

 Our guide said that sometimes the sea lions leave the islands for a few 

 days, and this may account for the failure to find them about their 

 usual haunts. The consensus of opinion among the residents of Maria 

 Madre was that these animals are now very scarce. Formerly they 

 were found in many places ; but at present a rocky point on the north- 

 west side and a jutting reef on the south side of Maria Magdalena 

 and some islets west of Maria Gleofa are the only landing places used. 



It is possible that the Guadalupe Island fur seal {Arctocephalus 

 townsendi Merriam) may also occur at times about the islands. 



Rhogeessa parvula H. Allen. Tres Marias Rhogeessa. 



EJiogeessa parinda H. Allen. Proc. Acad. Nat. Sci. Phila., 1866; p. 285. Type from 

 the Tres Marias. 



These little bats were rather common on Maria Madre, where they 

 live in the forest and fly at dusk along the trails and about small open 

 places. At times they appear in such situations in broad day. Two 

 were killed while flying up and down a trail in the brilliant sunshine in 

 the middle of the forenoon, and I saw one hawking for insects among 

 the tree tops along a trail two hours before sunset. As a rule, however, 

 they only come out when it is too dark for one to see more than an 

 indistinct form as they flit about among the trees. A few were also 

 seen on Maria Magdalena. 



My Otis nigricans (Maximilian). Maximilian's Black Bat. 



According to Mr. Oldfield Thomas, a specimen of this bat was taken 

 on the Tres Marias by Mr. Forrer.^ We took none, and they probably 

 occur on the island only as stragglers. 



Otopterus mexicanus (Saussure). Big-eared Bat. 



A colony of over a hundred big-eared bats was living in an old ware- 

 house at the settlement on Maria Madre, and others were found in sev- 

 eral caves situated in various parts of the island. The warehouse where 

 these bats were found had a large open window and wide cracks, so 

 that it was quite light inside, yet they were found hanging from the 

 ceiling and roof, in plain view, and evidently had lived there a long 

 time. The specimens were mostly females heavy with young. 



Glossophaga mutica Merriam. Tres Marias Glossophaga. 



Glossopliaga mutica Merriam. Proc. Biol. Soc. Washington, XII; pp. 18-19, Jan- 

 nary 21, 1898. Type from Maria Madre Island. 



This was by far the most numerous bat on Maria Madre, where it was 

 found in every cave sufficiently deep to be dark. One cave was among 



^ Biologia Centrali- Americana, Mammalia, 206, 1881 (under Vesj^ertilio nigricans). 



