ALLEN: MAMMALS FROM THE BLUE NILE VALLEY. 351 
pique; S. n. colias Thomas, from British East Africa; and S. n. leuco- 
gaster (Cretzschmar) from Northeast Africa. The status of S. bor- 
bonicus I do not know. . In these forms the forearm is large, from 51 to 
57mm. The smaller species seems to have corresponding geographic 
races, but their relationships are not yet settled. To this group 
belong apparently S. nzgritellus de Winton, a small species from the 
Gold Coast, forearm 44.5 mm.; S. damarensis Thomas, a larger form 
from Damaraland, forearm 48 mm., S. viridis (Peters) of Mozambique, 
forearm 46, olive-green above, greenish yellow below; and S. altilis 
here described, which’ is at once distinguished by its size and color 
from these. 
In addition to the type, specimens were taken at Bados, El Serifa, 
and Fazogli along the Blue Nile. Their flight and appearance was as 
in the larger species, and they were similarly fat, whence the Latin 
designation. 
CHAEREPHON MIDAS (Sundevall). 
Hedenborg’s Free-tailed Bat. 
Dysopes midas Sundevall, Kongl. Svenska vet.-acad. Handl. for 1842, 1843, 
p. 207, pl. 2, fig. 7, a-e. 
| 
De Winton (1901) in his review of the Nyctinomi of Africa, rede- 
_ scribed this species on the basis of an imperfect cotype in the British 
Museum. Sundevall received several specimens taken in the Acacia 
| trees on islands of the White Nile by Hedenborg, who suggested the 
_ name in a note sent with them. The original description is clear and 
b points out the characters separating it from “D. cestoni” (= C 
| 
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taemotis) of Europe; the skull is figured of natural size, showing ie 
great breadth of the braincase and the narrow rostrum. We obtained 
a single specimen at Fazogli, near the Abyssinian border, from a 
| _ native who had caught it in a hollow tree. The general color above 
, is chocolate, with a grayish suffusion due to the pale tips of the hairs. 
| Below, these pale tips are more extensive, giving a hoary appearance. 
_ A narrow line of whitish hairs extends from the elbow along the outer 
h side of the forearm to the carpus. De Winton describes the skull in a 
_male as having a “very high keel-like sagittal crest raised above the 
» forehead from between the eyes” but in our female this crest is barely 
| indicated. The forearm measured 61 mm.; Sundevall gives 60 mm. 
_ The skull measures:— greatest length 25. 5 mm., palatal length 11, 
_ Zygomatic breadth 15; breadth outside last nigleirs 11; interorbital 
_ constriction 5; upper tooth row excluding incisors 10, lower tooth row 
excluding incisors 11.1. 
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