ARKIV FÖK ZOOLOGI. 



BAND 14. N:o 20. 



A third Coiitributioii to tlie Maminalogy of 



Ecuador. 



By 



EINAR LÖNNBERG. 



With 3 figures. 

 Read December 1^^ 1921. 



Consul L. Söderström has recently favoured the R. 

 Natural History Museum by presenting stiJl another collec- 

 tion of Mammals. On this valuable material the following 

 remarks are based, by which increased knowledge is won 

 about the morphology, variation and geographical distribu- 

 tion of some rare mammals. Three forms have proved to 

 be new and have thus been described and named. 



Ateles fusciceps Gray. 



Two specimens, both collected at Gualea, 4000 f. alt., 

 are of great interest, because they show probably the ex- 

 tremes of the variation of the colour of the head. In one 

 (?) ('Vio 1918) the upper part of the head behind the black 

 frontal band is very påle, about the lightest shade of »cha- 

 mois» (Rép. de coul. 325, i), on the occiput merging into 

 »deep bistre» (Rép. de coul. 303.2). In the other (J^) speci- 

 men (1920) the head is very dark, so that only the anterior 

 half of the crown behind the frontal black band has a very 

 dark shade of »burnt umber» on the tips of the hairs. The 



Arkiv för zoologi. Bd 14. A'.o 20. i 



