The 1922 Africa map differed from today's: notice French West Africa, Anglo-Egyptian Sudan, and this Congo
[DOC] [TLE] Full text of "Revision of the African snakes of the genera Mehelya ... [PAR] (French Cameroon; French and Belgian Congo; A.-E. Sudan; Uganda; .... 
Midbody loveridge: African snakes 137 scales in 15 (17-19 on neck) rows, ... Wau 
and Chak Chak, Bahr el Ghazal Province, Anglo- Egyptian Sudan.