﻿92 



NORTH AMERICAN FAUNA. 



Fig. 22.— Side view of skull 

 of (a) Pipistrelliis hespcrus 

 and (6) P. suhflavus ( \ 2) . 



Typical Pijnsfrelhis suhffarKs presents a wide range of individual 

 variation in color. This is due to the extent of tlie terminal dark bands 

 on the hairs of the back, and also to tlie exact shade of the yellowish 

 subterminal bands. The yellowest specimens that I have seen were 

 taken at Washington, D. C, during May and June. 



SMJl. — The skull of PipistyeUus suhflavus (figs. 21a and 22 Z>) is 

 larger than that of P. hespcrus. That of an adult 

 male from Washington, D. C, measures 13 mm. in 

 occipito nasal length, 8 mm. in zygomatic breadth, 

 and 5 mm. in occipital depth. The dorsal outline 

 is nearly straight from the anterior nares to a point 

 immediatelj^ behind the orbits, then strongly con- 

 vex to occiput. Muzzle narrow and arched, the 

 concavities on each side nearly obsolete. In gen- 

 eral the skull of Fipistrellus suhflavus suggests a 

 miniature of that of the smaller forms of YespertiUo. 



Teeth.— The teeth of Pi2)istrcJIus suhflavus (fig. 

 23 h) are larger than those of P. hesperus but essen- 

 tially similar in form. The anterior upper premolar is large (about the 

 size of the larger upper incisor) and generally fully in the tooth row. 

 Measurements. — See table, page 957. 



Specimens examined. — Total number, 213, from the following local- 

 ities : 



Alabama: Greensboro, 2. 



District of Coluinbla: Wasliington. 17 (11 skins). 



Indian Territory : Stil^'ell, 13. 



Louisiana: Mer Rouge, 10 ; Houma, 2 (skins). 



Maryland : Marshall Hall, 

 5 (skins) ; St. Georges 

 Island, 2 (skins). 



Mississippi : Washing- 

 ton, 8. 



Missouri : Marble Cave, 



Stone County, 70. 

 New York : Sing Sing, 33. 

 North Carolina: Raleigh, 



7 (skins); Bertie 



County, 2 (skins). 

 Pennsylvania: Carlisle, 



7 (1 skin). 



Tennessee: Hickman County, l(skin); Arlington, 3; Big Sandy, 10; Danville. 4. 

 Texas: Clear Creek, Galveston County, 1; Brownsville, 1. 



Virginia: Cedarville, 6 (skins. Miller coll.): Fredericksburg, 6 (skins): Hamp- 

 shire County, 1 (skin): Wytheville. 2. 



General reniarJcs. — The Georgian bat, PipistreUus suhflavus, is so 

 readily distinguished among the species of the region it inhabits that 

 detailed comparisons are scarcely necessary. Its dental formula, small 

 size, relatively large thumb, distinctly trieolored fur and general yel- 

 lowish color are unmistakable characters. * 



Fig. 23.— Teeth of {a) Fiinstrelliis hesperus and (&) P. suhflavus 

 (X5). 



