22 



EINAR LÖNNBERG, MAMMALS COLLECTED IN CENTRAL AFRICA. 



known, does not disagree with the present specimens in any important point, I have 

 nsed this nanie for the Chimpanzees of Rutshuru especially as the type locality of cotloni, 

 »»Sassa-Fluss, siidöstlich des Albert-Edward Sees», is not geographically very distant 

 from Rutshuru. 



Cranial dimensions of adult Chimpanzees from Rntshuru. 



c? 



n:o 70 



c? 

 n:o 163 



9 

 n:o 1.60 



Total length of skull 197,5 



Oceipitonasal length 151 



Basal length 135,5 



Condylobasal length j 150,5 



Zygomatic breadth ! 123,5 



Least postorbital breadth .... 



Breadth of brain-case 



Breadth across alveoles of canines 



» » outsido of m 1 . . . 



Length of palato mesially . . . . 



» • upper molar series . . . 



» » » true raolars . . . 



» » lower molar series . . . 



» » » true molars . . . 



Breadth across orbits 



Least interorbital vvidth 



Height of orbit inside 



Width » » » 



Breadth of m 3 



69,7 

 100 

 58,4 

 54,7 

 75,8 

 46.3 

 31,7 

 51,5 

 34 (33, 

 98,5 

 18,8 

 27,2 

 32,3 



11 



186 mm, 



141,8 



131,5 » 



145 



131 » 



65 » 



100 



65,5 » 



53, G » 



78.4 » 

 43,1 



29.5 • 

 48,2 » 

 31,7 



103,7 » 



19,8 » 



32 » 



31 » 



10,8 » 



184.0 mm 

 139,5 » 



142,3 » 

 123,2 



69 » 



100 » 



54 



58 • 



44,5 » 



30,5 » 



49,5 - 1 



32,7 >' 



100.1 » 

 14,2 •> 

 37,7 » 

 35,5 » 



11,2 » 



n:o 161 n:o 178 



? ? 



a:o 181 n:o 224 



186 mm. 

 141 



129 » 



144,6 » 



113 » 



60.6 » 



92.4 » 

 50 » 

 51,3 » 

 73,7 



43.5 » 



30.2 » 

 51 



34 » 



94.3 » 

 16 

 28,8 ' 



32.7 »> 



11,2 » 



179,5 mm. 189 mm. 



136 » 

 125 » 

 141,5 • 

 121 



67,5 » 



96,5 » 



51 



55 » 



71 



39 » 



26.3 » 

 43 



28.4 » 

 90,2 

 13 

 37,4 

 32 



9,5 • 



143,5 



129 



143,5 



117,5 

 71 



98,5 

 51,7 

 52,3 

 71,8 

 44,8 

 30 

 51 

 33,7 



101 

 18,3 

 32,7 

 32,7 



9,8 



177 n 



134,8 

 123,5 

 137,5 



06,5 



93,7 



51,2 



55,3 



69,5 



40,1 



28,2 



44,s (44) 



30,1 



11,6 



32 



33,2 



9.7 



The measurements recorded above show a very considerable variation chiefly with 

 regard to the orbits, interorbital space and the teeth. 



The shape of the orbits influences the superciliary ridge which in all is very pro- 

 nounced, but with differently arched outline. In the ef n:o 70 (Pl. V, tig. 1) it forms an 

 even arch with no concavity above the interorbital space. The ? n:o 181 shows almost 

 the same condition, but in the ef n:o 163 there is a slight depression above the inter- 

 orbital region, or perhaps more correctly the superciliary arch above each orbit is inde- 

 pendently a little more elevated than mesially. In the $ n:o 161 (Pl. V, fig. 3) about the 

 same condition prevails, but in the females n:s 178, 224, and 160 (Pl. V, fig. 4) the arches 

 above the orbits are considerably raised, and in the last the mesial concavity amounts 

 to nearly 4 mm. which does not sound much, but nevertheless gives a quite strikingly 

 different aspect of these skulls, effected by the simultaneous raising of the eyebrow ridges 

 with a mesial concavity between them and the increased height of the orbits. This 

 enlargement of the orbits is, however, only produced by the raising of the superciliary 

 ridges, and therefore the upper portion of these orbits looks very shallow. 



1 Not coimting extra anomalous molar. 



2 Premolars vvauting, thus approximately Ironi alveoles. 



