ALLEN: MAMMALS FROM THE BLUE NILE VALLEY. 351 



bique; 5. n. coUas Thomas, from British East Africa; and S. n. leueo- 

 gaster (Cretzschmar) from Northeast Africa. The status of S. bor- 

 bonicm- 1 do not know. In these forms the forearm is large, from 51 to 

 57 mm. The smaller species seems to^have corresponding geographic 

 races, but their relationships are not yet settled. To this group 

 belong apparently S. nigritellm deWinton, a small species from the 

 Gold Coast, forearm 44.5 mm. ; S. damarensis Thomas, a larger form 

 from Damaraland, forearm 48 ram., 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 t\T)e, 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 (Sundcvall). 

 Hedenborg's Free-tailed Bat. 



Dysopes midas Sundevall, Kongl. Svenska vet.-acad. Handl. for 1842, 1843, 

 p. 207, pi. 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 

 points out the characters separating it from "D. ccstoni" {= C. 

 taeniotis) of Europe; the skull is figured of natural size, showing the 

 great breadth of the braincase and the narrow rostrum. ^Ye 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 

 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 molars 11; interorbital 

 constriction 5; upper tooth row excluding incisors 10, lower tooth row 

 excluding incisors 11.1. 



