KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 58. NIO 2. 



17 



thus in this respect to, or even above the maximum and stånd high above the average. 1 

 A result of this is that the difference between the male and female brain-capacity, which 

 in the Mikeno Gorillas is about 150 — 162 ccm., is verv much greater in this race than the 

 average which is put to only 60 ccm. by Selenka. 



According to Captain E. Arrhenitjs the Gorillas are rather numerous on the vol- 

 cano Mikeno. At one opportunity lie met with a band of about 30. They are, however, 

 very shy and live in such localities where it is extremely difficult for a man to penetrate. 



Fig. 1. Tho Volcano Mikeno, where the Gorillas live. The summit is covered with snow. 



( 'apt. Arrhenius and his men had to crawl on all four in single filé through the thickets 

 of bamboo, and it was therefore difficult for him to get space enough to shoot when he 

 struck the band of Gorillas. He saw once a large male who hurried away on his hind legs 

 with a big pole in his hand. When disturbed the Gorillas are said to take their refuge 

 higher up on the mountain in still more unaccessible places. 



Captain Arrhenius wrote in a letter about the occasion when he surprised the band 

 that they made a tremendous noise - - »they barked, screamed and babbled». 



Captain Arrhenius has further given the following information concerning the 

 Gorillas of Mikeno, which are called »Tngagi» by the natives in the language »kiniaruanda ». 

 They live in bands consisting of 20 — 30 individuals, and do not remain more than about 

 a month at the same ])lace. When they liave eaten up what they can find in one tract of 



1 The capacity of an old Gorilla skull from Cameroon in this Museum is 560 ccm. 



K. Sv. Vet. Akad. Handl. Band 58. N:o 2. 3 



