no. 1655. NOTES ON VERTEBRATES FROM INDIANA HAHN. 579 



Lar, but the cinnamon tips are longer and brighter and the bases of 

 the hairs darker. 



The seasonal variation in color, in so tar as it can be determined 

 from this series of eighteen skins, may be summarized as follow-: 

 The old coal of hair is shed in July or August, while the new growth 

 is Mill quite short. The new hairs are at first nearly unicolor, the 

 tint being something near mouse gray. As the hairs lengthen, the 

 basal pari grows darker, finally becoming almost black in some 

 individuals, while the tip assumes a reddish tinge which may vary 

 from bright cinnamon to tawny olive or raw umber. Alter a time the 

 reddish tinge fade- in some individuals, leaving the animals drab or 

 grayish in color, while others retain the reddish color throughout the 

 year. The hairs of the underside are at firsl dark at the base and 

 yellowish at the tips, but the yellow fades also, leaving the animals 

 white beneath. The dark bases do not show on either the dorsal or 

 ventral sides. 



The ear varies more than any other structural character, the ex- 

 treme- being 11 and L6 nun. The forearm varies from :'>l to Id mm. 

 and the tibia from L6 to 1!> mm. Cranial variation is comparatively 

 slight. 



Average measurements (from the flesh) of eight males and two 

 females: Total length, 87..9 mm.; tail vertebra'. 37.6; hind foot, 9.9; 

 ear. from crown. L2.7; forearm. 37.8; tibia, 17.1. Cranial measure- 

 ments: Greatest length of skull, L5.3 mm'.; basilar length, L1.8; pala- 

 li lar length, 7.:'>: greatest width of braincase, 8.1; depth of brain- 

 case from aduital bullae, 7.4; maxillary tooth row, 7.3. 



MYOTIS LUCIKUGUS (Le Conte). 

 LITTLE BROWN BAT. 



This is by far the most abundant species of bat in this vicinity. 

 Not less than four hundred passed the winter in the caves of the 

 University property, and the number may have been much larger, as 

 these animal- sometimes creep away into the -mall crevices where 

 they can not be seen. During the greater part of the year they are 

 gregarious, cave-dwelling bat-, but during the summer very few are 

 found in the cave. 



Color variations consist chiefly in a difference in intensity and 

 apparently have no relation to season or sex. Some individuals are 

 very near the typical color of Eptesiciis fuscus (dark cinnamon), 

 while other- are very nearly tawny olive at the tip- of the hair-. 

 Still others are much darker, near Prout's brown. Molting seems 

 to take place at any time during the summer. The darker basal 

 part of the hair- is not so well concealed by the reddish tip-, and the 

 color is apt to be darker jnst after the molt. However, there are 



