352 bulletin: museum of comparative zoology. 



Chaerephon emini (deWinton). 

 Emin's Free-tailed Bat. 



Nyctinomus emini de Winton, Ann. mag. nat. hist., 1901, ser. 7, 7, p. 40. 



Wroughton (1911) has recorded this species from Roseires, on the 

 Blue Nile, where a single male was taken by Mr. A. L. Butler. We 

 collected a specimen not far from the same locality, at Aradeiba, 

 which seems to be the same species, though differing from the type as 

 described by de Winton in that the first upper premolar is crowded 

 slightly to the exterior of the line of the tooth row instead of standing 

 directly in it. The lower incisors are markedly bifurcate in this 

 specimen in addition. The color above is a very grayish brown rather 

 than reddish bro"vvn; the throat hairs are pure white to their bases, 

 and this color extends down the midventral line. The hair at the 

 elbow and thence along the sides to the groin is not white but more 

 like that of the sides of the body — a variation similar to that seen in 

 this area of C. puniilu^. The forearm measures 42 mm. ; that of the 

 type specimen from Mosambiro, 43 mm. The skull measures: — 

 greatest length 19 mm., palatal length 8.2; width outside last molars 

 9.5; zygomatic width 12.7; interorbital constriction 4; upper tooth 

 row excluding incisors 7.5; lower tooth row excluding incisors 8.5. 



Chaerephon bivittatus (Heuglin). 



Grav-streaked Free-tailed Bat. 



Nyctinomus hiviltatus Heuglin, Nova acta Acad. Leop. Carol., 1861, 29, art. 8, 

 p. 13. 



Two large heavy-bodied bats from El Garef on the Blue Nile, seem 

 to represent Heuglin's species, though the forearm measurement 

 (42, 44 mm.) seems rather smaller than that given by the describer 

 (1 inch 10 lines = 46.4 mm.). Heuglin's specimens were from Keren, 

 in north-central Erythrea. The color above is very dark brown 

 with a minute frosting of gray, and with scattered specks or streaks 

 of whitish, on the nape, shoulders, and back; below, the fur is grayish, 

 darker on the sides, and clearer on the lower throat. The two speci- 

 mens were very fat and heavy bodied. They were flying shortly after 

 sunset, going in a rather steady slow course, in comparison wdth the 

 smaller species. Compared with C. emini, which it approximates in 



