1917.] Lang and Chapin, Field Notes on African Chiroptera. 529 



made some remarks on the comparative brightness of color of these forms 

 which our larger series from the same locality would show to be purely 

 individual. Dr. Allen has pointed out (p. 440) that " the length of the red 

 tips to the hairs of the back varies from 2 to 5 mm. in length in specimens 

 taken the same day." Furthermore the length of the hairs, given by Thomas 

 as 5 to 6 mm., in our series of both subspecies varies from 4 to 8 mm. and the 

 longer ones appear somewhat shaggy. The bright color cited above may, 

 in worn specimens, fade to cinnamon on the back and paler on the under 

 side. The specimens with very short red tips look somewhat dusky since 

 the dark bases show through. 



Our specimens are all from Bafwabaka and Medje, but the type locality 

 is Efulen, Kamerun, nearly 1000 miles westward across the forest. Its 

 habits would indicate that it has as wide a distribution as Pipistrellus 

 nanus, but since it seldom visits villages and keeps away from houses it is 

 not liable to come to the notice of travellers. 



30. Myotis bocagii hildegardese Thomas. 



In addition to the remarks under M. bocagii cupreolus we may state that 

 this is an equally pretty bat though slightly paler and somewhat larger. 

 Its total length is 3.55 inches (90 mm.) and the spread of wings 10.25 inches 

 (260 mm.). 



We found it living in the same banana plantations with Pipistrellus, 

 though most of them were found hiding beneath the dead overhanging leaves 

 of plantains and only a few between the fruits in the bunches. 



Myotis bocagii hildegardece undoubtedly replaces M. bocagii cupreolus 

 outside the rain-forest in the more open country. Its type locality, Fort 

 Hall at the foot of Mt. Kenia, lies nearly 600 miles eastward of Aba. 



31. Pipistrellus nanus {Peters). 



This pipistrelle is one of the very small African bats; it measures only 

 3 inches (76 mm.) from the nose to the end of the tail, the latter accounting 

 for nearly half the length. The expanse of the dark wings is 7.25 inches 

 (184 mm.). The fur is darker basally, and though warm sepia is the most 

 common shade, blackish-brown specimens occur occasionally, the under side 

 being always a little lighter. The variation in color is individual and not 

 influenced by age or difference of sex. 



On rare occasions two young are born. We had at least one female in 

 August with two embryos, though in December and January single young 



