292 DR. KNUD ANDERSEN ON BATS. [^W- 7, 



brown ; hair-bases on the hinder back hght greyish di'ab, on the 

 neck ecru-drab. Under side drab. Facial stripes strong. Karrow 

 white edgings to the ears. No light tips to the wings. — These 

 are the lightest coloured individuals I have seen ; very likely a 

 still lighter phase occurs, similar to that of A. watsoni (p. 290). 



Range. — Northern part of S. America : Para, Guiana, Vene- 

 zuela (including Trinidad), Colombia. 



Remarls. — This species cannot be discriminated with certainty 

 from A. glmccios and watsoni without an examination of the teeth 

 (a rudimentary nig present in glauciis and watsoni, wanting in 

 cinerPAis). 



Two geographical races ai-e separable, differing only in size. 

 The one, A. c. cinereus, has probably its centre of distribution in 

 Guiana, having spread southward at least to Para, northward 

 to N.W. Venezuela ; the other, A. c. bogotensis, seems to have its 

 centre in Colombia, having spread northward to JST.W. Venezuela, 

 where consequently both forms meet. 



Arxibeus cinereus cinereus Gervais. 



Stenoderma cinereum Blainville, MS. label in Paris Museum {fide Gervais, 



I. i. c). 

 1856. Dermamira cinereum Gervais, Exp. Castelnau, Mamm. 2" Mem. livr. 15, 



slieet 5*, p. 36; pi. viii. figs. 4, 4f<; pi. ix. figs. 4, 4«; pi. xi. fig. 3. — Type 



localitj' : " Bresil." 

 1901. AHiheus cinereus Gerv., Thomas, Ann. & Mag. N. H. (7) viii. p. 143 (Aug. 



1901).— Kanuku Mts. 

 1901. Artibeus cinereus Gerv., Thomas, Ann. & Mus. N. H. (7) viii. p. 192 (Sept. 



1901).— Para. 



Diagnosis. — Teeth, skull, and external dimensions avei^aging 

 smaller. Forearm 39-42 mm. 



A. c. cinereus and bogotensis. — There is only an average dif- 

 ference between the eastern form of A. cinereus here under con- 

 sideration and the western form of the same species described 

 below [A. c. bogotensis). The skull, in A. c. ci7iereits, is on the 

 whole slightly narrower, the maxillary width ranging between 

 8 and 8'6 mm. (average 8'3 mm.), in A. c. bogotensis between 

 8"5 and 8"9 mm. (average 8"6 mm.). The teeth are slightly 

 smaller ; the length of the upper tooth-row varies between 6 "4 

 and 6'8 mm. (average 6"7 mm.), in A. c. bogotensis between 6"7 

 and 7"2 mm. (average 6"9 mm.). The forearm and metacarpals 

 average 2"2-3"5 mm. shorter. 



Measurements. — On p. 295. 



Specimens examined. — 10 specimens (4 skins) and 8 skulls, from 

 the following localities : — 



British Museum : — Para (1). Kanuku Mts., British Guiana, 

 about 59° W., 3° N. (4). Trinidad (1). Merida, Venezuela (2). 

 ISr.W. Venezuela (1). — 7 skulls, representing all these localities. 



* The title-page of the volume is dated 1855 ; on the probable dates of publica- 

 tion of the liv)-aisons see C. Davies Sherborn and B. B. Woodward, Ann. & Mag. 

 N. H. (7) viii. p. 164 (Aug. 1901). 



