﻿COEYNORHINUS MACROTIS. 



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CORYNORHINUS MACROTIS (Le Conte). Big-eared Bat. 



1831. Plecotus macrotis Le Conte, McMurtrie's Cuvier, Animal Kingdom, I, Appendix, 

 p. 431 ((^eorgia). 



1837. Plecotus leconiii Cooper, Ann. Lye. Nat. Hist. N. Y., IV, p. 72. (Name j^roposed 

 as substitute for macrotis.) 



1864. Synotns macrotis H. Allen, Monogr. N. Am. Bats, j). 63. 



1865. CorijuorJiinus macrotis H. Allen, Proc. Acad. Nat. Sci. Pliila., p. 173, 

 1893. Cori/norJiiuKs macrotis H. Allen, Monogr. Bats N. Am., p. 55. 



Type locality. — Georgia (see Proc. Acad. Nat. Sci. Pliila., 1855, ]). 434), 

 probably near the Le Conte Plantation, 5 miles south of Kiceboro. 



Geographic distribution. — Lower Austral zone in the eastern United 

 States. 



General characters. — Size large (forearm 41 mm. to 42 mm., ear about 

 32); fur everywhere distinctly bicolorj general color yellowish brown. 



Ears. — The ears of typical Gorynorhinus macrotis do not ai)j)reciably 

 differ from those of the other subspecies. They are so different from 

 those of all other North American bats as scarcely to require detailed 

 description. They may be instantly recognized by their length, much 

 more than half that of forearm, and by the form of the tragus. This 

 is sinqde, with a large basal lobe, and wholly free from the auricle. In 

 UndoDia niaculatumy tlie only other North American bat with ears 

 approaching those of Gorynorhinus in size, the tragus is joined to the 

 external basal lobe. 



Membranes. — The meuibranes are broad and amx)le. In texture they 

 are remarkably thin and delicate for so large a bat. Wings (PI. Ill,- 

 fig. 2) attached at side of metatarsus just below base of toes. CJro- 

 patagium extending to extreme tip of tail. 



Feet. — The feet are slender, less than half as long as tibia^, and armed 

 with strong claws. Calcar a little shorter than tibia, and about equal 

 to free border of interfemoral membrane. It is without vestige of keel 

 on x)osterior border. The termination is obscure and without lobule. 

 Back of toes sprinkled with long bristly hairs. 



Fur and color. — The fur is soft and silky, that on middle of back 

 averaging about 12 mm. in length. In distribution it shows no striking 

 peculiarities. It extends a short distance on the dorsal base of the ear, 

 but scarcely reaches the wings or interfemoral membrane. 



Back uniform yellowish brown, much as in Myotis lucifuyus; the 

 hairs everywhere sepia through a little more than the basal half and 

 with very indistinctly pale tips. Belly grayish white; throat and chest 

 darker and more tinged with yellowish. Throughout the ventral sur- 

 face the fur is very shari)ly bicolor, the dark bases of the hairs consider- 

 ably darker than on the back. The light tijys are too short wholly to 

 conceal the dark under fur. Ears and membranes light brown. 



SMll and teeth. — The skull (fig. 8) and teeth (fig. 9) have been suffi- 

 ciently described under generic characters. An adult skull from 

 Houma, La. ( 9 No. 45894, United States National Museum, Biological 

 Survey collection), measures: Greatest length, 16 j zygomatic breadth, 



