ALLEN: MAMMALS FROM THE BLUE NILE VALLEY. 345 



Lavia frons affinis Andersen and Wroughton. 



Northern Big-eared Bat. 



Lavia from affinis Andersen and Wroughton, Ann. mag. nat. hist., 1907, ser. 7, 

 19, p. 140. 



Specimens of this bat were obtained at Singa and Abu Zor on the 

 Blue Nile, and at El Abiad on the Binder. De Winton (1900) records 

 it also from Roseires. No doubt it is one of the common species and 

 widely distributed. Compared Math a series of skins from British 

 East Africa (Guaso Nyiro) representing L. frons frons those from the 

 Sudan are decidedly smaller (forearms 56-61 mm., as against 62-63) 

 and paler in color. Two males differ from any of the East African 

 specimens in the color of the fur on the rump which shades into olive- 

 green and forms a distinct patch at the posterior end of the body, con- 

 trasting with the pearly gray of the rest of the coat. At Singa, 

 December 28, 1912, two, a male and female, were found hanging in the 

 branches of a thin mimosa tree where it was still shady in the early 

 forenoon. They hung one atop of the other and were possibly a mated 

 pair. At other times they are frequently distiu'bed among thick 

 bushes or vines in the daytime and ever alert, fly to a new covert 

 when approached. Their habits during their periods of activity we 

 could never observe. None were ever identified or shot in the evening 

 when other species were collected. At El Abiad, however, just before 

 dawn I noticed several flying about a large thorn tree above our tent 

 and finally coming to rest in its upper twigs as the daylight came on. 

 The shelter was so thin, that had thev been undisturbed, thev would 

 doubtless have quitted it later for some thick vines near at hand. 

 The dull orange-yellow of the membranes soon fades out in the pre- 

 served specimen. 



Rhinolophus dobsoni Thomas. 

 Dobson's Leaf-nosed Bat. 



Rhinolophus divosus Dobson, Cat. Chiropt. Brit, mus., 1878, j). 120 {nee 



Riippell). 

 Rhinnlo'phus dobsoni Thomas, Ann. mag. nat. hist., 1904, ser. 4, 14, p. 156. 



Thomas has showTi that the alcoholic specimens from which Dobson 

 drew his description of R. divosus, were not that species but belong 



