S60 REPORT OF THE HARVARD AFRICAN EXPEDITION 
belonging to two fundamentally distinct zodgeographic subregions of the Ethio- 
pian Region. By far the greater part of the Belgian Congo belongs to the West 
African Subregion, its fauna being similar to that of Upper and Lower Guinea. 
The southeastern corner (in what may be called Upper Katanga) and the high- 
lands along the eastern border, however, are included in the East-and-South 
African Subregion, their fauna being essentially that of the neighboring terri- 
tories of East Africa.? 
Of the one hundred and thirty-four species and varieties of the subjoined list, 
few are generally or very widely distributed throughout the Ethiopian Region. 
Such omnipresent forms are Chrysops longicornis Macquart, Tabanus africanus 
Gray, T. par Walker, 7. thoracinus Palisot de Beauvois, T. biguttatus Wiede- 
mann, 7’. canthomelas Austen, T'. atrimanus Loew, T. variabilis Loew, T. gratus 
Loew, 7. laveranit Surcouf, T. fraternus Macquart, T. sagittarius Macquart, 
T. taeniola Palisot de Beauvois, Haematopota pertinens Austen, H. decora Walker, 
and H. vittata Loew. 
The following species may be regarded as typical of the West African Sub- 
region: Dasycompsa cincta Enderlein, Hinea rodhaini (J. Bequaert), Taba- 
nocella stimulans (Austen), Thriambeutes singularis Grinberg, Subpangonia 
gravoti Sureouf, Nuceria mayombensis J. Bequaert, Chrysops dimidiata van der 
Wulp, C. funebris Austen, C. silacea Austen, C. distinctipennis Austen, Tabanus 
argenteus Sureouf, 7. besti Sureouf, 7. billingtoni Newstead, T. canus Karsch, 
T. claripes Ricardo, T. congoiensis Ricardo, T. fasciatus Fabricius, 7’. fuscomar- 
ginatus Ricardo, T. tanthinus Sureouf, T. trroratus Surcouf, T. marmorosus 
Sureouf, 7’. obscurefumatus Surcouf, T. obscurehirtus Ricardo, T. obscurior Ri- 
eardo, 7. regnaulti Sureouf, T. ruficrus Palisot de Beauvois, 7’. secedens Walker, 
T. socialis Walker, Thaumastocera akwa Grinberg, Haematopota angustifrons 
Carter, H. duttoni Newstead, H. harpax Austen, H. inornata Austen, H. ochra- 
cea (Bezzi), Hippocentrum strigipenne (Karsch), and H. versicolor Austen. 
While most of these species extend eastward into Uganda or even into the 
Nyanza Province of Kenya Colony (the fauna of that Province being typically 
West African), some do not reach westward beyond the Cameroon. In the 
Katanga District a number of West African species extend southward beyond 
the limits of the West African Subregion along the valleys of certain rivers, 
their distribution following that of the tsetse-fly, Glossina palpalis. A few spe- 
cies, such as Chrysops brucei Austen, seem to be more or less restricted to the 
Uganda-Unyoro District. 
The East-and-South African elements are found only in Upper Katanga 
and the mountains of the eastern borderland. They comprise: Mesomyia 
fallax (Austen), Tabanocella innotata (Karsch), T. uwmbraticola (Austen), Philo- 
liche oldii (Austen), Dorcaloemus auricomus Austen, D. compactus (Austen), 
Nuceria schwetzi (Austen), Chrysops laniger Loew, C. stigmaticalis Loew, Taba- 
! The boundary between the West African and Kast-and-South African Subregions may be seen 
on the map of the zodgeographic regions of the Belgian Congo published by H. A. Pilsbry and J. Be- 
quaert in 1927 (Bull. Amer. Mus. Nat. Hist., LILI, p. 487). The same publication contains a summary 
of the topography, climate, vegetation and other ecological conditions of the territory here under dis- 
cussion. 
