242 DR. KNUD ANDERSEN ON BATS. [Apr. 7; 



A. p. planirosfris, in external dimensions rather intermediate 

 between A. 2)- trinitatis ^wA 2il(tnirostris. 



A. p. grenadensis and closely allied forms. — The skull, teeth, 

 and external dimensions of A. j)- gre7iadensis average somewhat 

 larger than in its nearest relative, A . p. trinitatis. The size of 

 the skull and teeth is almost quite as, or if anything still a trifle 

 larger than, in A. p. planirostris, but externally A. p. grenadensis 

 averages somewhat smaller than this latter race. For details see 

 the table of measurements, p. 246. 



Though undoubtedly an offshoot of the Trinidad-Tobago race, 

 this form has almost reversed to the size of the continental 

 A. p. planirostris ; practically it is difficult to discriminate 

 A . p. grenadensis from this latter. But even if it were proved 

 that A. p. grenadensis is, also in average characters, completely 

 similar to the Venezuelan and Brazilian A. p. p)lanirostris, it 

 would be reasonable to keep it separate ; there is only one other 

 alternative, viz. to xvnite A. p. planirostris, trinitatis, and grena- 

 densis into one " race," as opposed to the unquestionably much 

 more different A. p. fallax ; but this would obliterate the two 

 facts that passing from Venezuela to Trinidad-Tobago there is a 

 decrease in the average size of the individuals, and passing from 

 Tobago to Grenada there is, again, an increase in the average 

 size, — facts which seem to me worth recording and, if so, are to 

 be expressed in the technical names of these bats. 



Specimens examined. — 11 specimens (6 skins) and 8 skulls, from 

 the following localities : — 



British Museum :— Grenada, W.I. (5).— 2 skulls. 



U.S. National Museum* : — Grenada, W.I. (6). — 6 skulls. 



Bange. — As yef. recorded only from the island of Grenada, 

 Windward Isles, W.I. ^ 



Artibeus planirostris fallax Pet. 



1865. Artiheus fallax Peters, MB. Akad. Berlin, pp. 355-57. — Type locality : Guiana. 

 1878. Artibeus planirostris Spix (partim), Dobsoii, Cat. Chir. Brit. Mus. p. 517. — 



British Guiana. 

 1898. ? Artibeus planirostris Spix, Tliomas, Boll. Mus. Torino, xiii. no. 315, p. 3 



(18 April, 1898).— Caiza, Tarija, S. Bolivia. 

 1901. Artibeus planirostris Spix, Thomas, Ann. & Mag. N. H. (7) viii. p. 143 



(Aug. 1901). — Kanuku Mts., B. Guiana (specimens examined). 



1901. Artibeus planirostris Spix, Thomas, Ann. & Mag. N. H. (7) viii. p. 191 



(Sept. 1901). — Para (specimen examined). 



1902. ?A7'tibeus hercules Rehn, Proc. Acad. N. Sci. Philad. pp. 638-39 (12 Oct. 



1902).— E. Peru. 

 1904. ? Artibeus planirostris Spix, J. A. Allen, Bull. Am. Mus. N. H. xx. Art. xxix. 



(8 Oct. 1904). — Ciudad Bolivar, Venezuela. 

 1907. Uroderma validum D. G. Elliot, Field Col. Mus., Publ. [no. 115, Zool. Sev. 



vol. viii. pp. 537-38, fig. 74 (skull). — Cayenne. 



Diagnosis. — Similar to A. p. j^lct^nirostris, but averaging con- 

 siderably larger. 



A. p. fallax as compared tuith the other races.— A. p. fallax is 

 the most completely differentiated of the four races of Ao'tibeus 



* U.S. N. M. nos. 111510, 111513-14, 111517, 111519, 111523. 



