234 DR. KNUD ANDERSEN ON BATS. [Apr. 7, 



Tips of wings (region of third phalanx of third digit) lighter- 

 coloured . 



The above description is taken from an adult female with 

 unworn teeth, preserved in alcohol. There can scarcely be any 

 doubt that the specimen represents a ■' light phase " ; the type in 

 the Berlin Museum is, judging from Peters's short description, 

 considerably darker. Similar contrasts in the coloration of the 

 fur occur in many other species of Artiheus. 



Measureinents .- — On p. 246. 



Specimens examined. — 2 ad. (ale). Para ; with skull ; British 

 Museum. — I have been unable to find the specimen ( 5 ad., 

 Upper Amazons) catalogued by Dobson (Z. s. c.) as A. planirostris 

 var. a. 



Range. — Surinam ; Para ; Upper Amazons (probably). 



Peters's ^4. cowcoZor, 1865. — Type locality: Paramaribo, Surinam. 

 A. Goncolor was described by Peters as being in every respect 

 similar to A. fallax [i.e. A. planirostris fallax of the present 

 paper], but much smaller ; molars f , m^ in position and relative 

 size as in A. fallax; "Unterarm" 47 mm. (Peters probably 

 measured the radius, not the "forearm"), tibia 18 mm. There 

 are no measurements of the skull in the original description, but 

 according to Prof. Matschie (in a letter quoted by Oldfield Thomas 

 in 1892, I. s. c.) the maxillary tooth-row measures 7'5 mm., the 

 maxillary width across m^-m' 9*9 or 10 mm. — These details seem 

 to exclude all doubt as to the identification of A . concolor. 



From the above description of A . concolor it will be evident that 

 Dobson was mistaken in regarding this species as a, mere variety 

 of A . jjlanirostris ; it is far more different from A . planirostris 

 than is this latter froi>i A. jamaicensis ("^4. perspicillatus " in 

 Dobson's Catalogue). 



A. concolor seems to be very rare in collections, the type in the 

 Berlin Museum, two specimens in the British Museum, and one 

 in the Para Museum being, to my knowledge, the only examples 

 on record. 



Artibeus planirostris Spix. 



Diagnosis. — Molars |^. Maxillary tooth-row 9"8-12 mm. Fore- 

 arm 55-73 mm. Tibia and distal pai-t of interfemoral so short- 

 haired as to appear almost naked. Colour of fur of upper side 

 not drab. 



Teeth. — The teeth of this species have been described in detail 

 and figured above, pp. 207-212, text-fig. 41. 



The rudimentary m^, situated postero-internally to m^, partly 

 pressed into a sharp angular emargination in the posterior margin 

 of this lattei', between its cusps 5 and 7, is very rai-ely wanting 

 in adult individuals. 67 skulls of fully adult individuals have 

 been examined, representing all the races of A. planirostris re- 

 cognised in this paper; in two skulls {A. p. fallax, c? ad. and 

 5 ad., British Guiana, teeth unworn and slightly worn, B.M 

 nos. 6.4.8.7 and 8) is m'^ present on one side, while the tooth 



