14 AMERICAN MUSEUM NOVITATES NO. 3963 

FIGURE 5. Coloration of the wing membranes in Myotis nimbaensis (AMNH 279589, holotype). A, Dorsal 
surface of the wing showing the dichromatic black and orange skin coloration. The plagiopatagium and dac- 
tylopagial membranes are mostly black with thin orange bands along the metacarpals, phalanges, and forearm; 
the black pigmentation also extends nearly to the body wall in the area between the forearm and the hind leg. 
The propatagium is pale orange. B, Dorsal surface of the anterior and proximal portion of the wing showing 
the patterning of the black pigmentation near the body. C, Dorsal surface of the distal wing showing the 
brown thumb and orange (not black) pigmentation of the membrane between digits II and III. 
of M. nimbaensis. The pelage of M. tricolor is similar to that of M. nimbaensis, and M. tricolor 
similarly lacks black spots on the face or tail membrane. However, these species can be distin- 
guished easily based on coloration of the wing membranes: M. tricolor has wings that are dark 
brown rather than the distinctive dichromatic orange and black wings seen in M. nimbaensis. The 
pinnae of M. tricolor are dark brown compared with the pale orange brown seen in M. nim- 
baensis, and the emargination is more proximally located (nearly at the midpoint of the lateral 
edge of the pinna) in M. tricolor compared to the clearly distal location of the emargination in 
M. nimbaensis. The uropatagium of M. tricolor is also darker brown (rather than orange brown 
as in M. nimbaensis) and has a dense covering of coppery red fur proximately (more sparse in 
M. nimbaensis). In terms of craniodental features, M. nimbaensis has a greater condylobasal 
length (18.9 mm for both sexes) than seen in M. tricolor (15.9-18.5 mm including data from table 
1 and Monadjem et al., 2010). Although our comparative sample of M. tricolor was not large, we 
found that most other craniodental measurements similarly appear to distinguish M. nimbaensis 
and M, tricolor, with M. nimbaensis the larger of the two species. 
Sagittal crest development in Myotis tricolor is variable, with females typically lacking any 
sagittal crest development. In contrast, both male and female M. nimbaensis have well-devel- 
