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states that at Uvalde, and in the foothills to the northward, where 

 bats are extremely abundant, mosquitoes often cause considerable 

 annoyance at night. On certain occasions when Mr. Bishopp' s 

 party camped in the foothills not far from where millions of bats 

 roost, they were annoyed by night-flying mosquitoes. A marked 

 illustration of how mosquitoes may breed in great numbers in the 

 presence of great numbers of bats is shown by an observation 

 which Mr. Bishopp' s party made at the time of one of their visits 

 to the Frio bat cave north of Uvalde. It seems that the bat guano 

 is removed from this cave once or twice a year and that during 

 this process the workmen camp at the cave for about two weeks. • 

 When they reached the cave in the fall of 19 14 they were greatly 

 annoyed at night by mosquitoes which were said to be more 

 abundant than they had ever seen them anywhere. When they 

 entered the cave they found that they had left a barrel of water in 

 its mouth from the previous spring and this was responsible for 

 the pests, which disappeared in a few days after the barrel had 

 been emptied. 



Mr. Bishopp collected a considerable number of bats as they 

 returned to the bat cave, and preserved the stomachs, and a 

 large number of slide mounts of the stomach contents of the bats 

 so taken were examined by specialists in the U. S. National 

 Museum. On the first lot. of slides the only insect remains which 

 were recognized were scales, legs, antennae, wings and bodies of 

 Lepidopterous insects (small moths). They were too badly 

 disintegrated for close naming. In the second series of slides 

 were found remains of Carabidae, especially Agonoderus, of 

 Jassidae, especially Agallia, of Tipulidae, the eggs of Noctuidae, 

 and the eggs and remains of other Lepidoptera. Nothing re- 

 sembling mosquito remains was found in the entire series. Dur- 

 ing the fall of 1914, and on a few occasions in 191 5, the feed- 

 ing habits of this bat were observed by Mr. Bishopp about arc- 

 lights. They were repeatedly seen catching moths of various 

 kinds, and seemed to show an especial liking for very large 

 noctuids, which were quickly devoured. His conclusions on the 

 whole are that these bats are very general insect feeders, seeming 

 to show a decided preference for moths, but he considers it 



