904 REPORT OF THE HARVARD AFRICAN EXPEDITION 
Mt. Ruwenzori), 7. amblychromus Speiser (Mt. Kilimanjaro), and 7’. canofasciatus 
Austen (Mt. Kenya). 1. imbecillus Karsch (of Usambara, Tanganyika Terri- 
tory) is perhaps also a Therioplectes, although Karsch described the eyes as bare; 
but Speiser, who saw the type, states that it is similar to his 7’. amblychromus. 
2. Sziladynus Enderlein contains species with hairy or pubescent eyes, but 
with the vertex strongly raised in the middle into a well-defined and often shiny 
callosity and with the frontal callosity well-developed. It corresponds to Thervo- 
plectes Enderlein (1925, Mitt. Zool. Mus. Berlin, XI, 2, pp. 346 and 357), not of 
Zeller.! In the Ethiopian Region this group seems to be but scantily represented. 
I should refer to it 7. nagamiensis Carter, I. muluba J. Bequaert, and 7’. sub- 
fasciatus T. Becker. 
3. Atylotus Osten Sacken contains species with the eyes more or less pubescent 
(generally strongly so in the male, often very faintly in the female), but with 
the vertex not raised appreciably. The frontal callosity is reduced to a small 
shiny spot (often hardly developed or absent) and the median callosity, if at all 
present, is very small and not connected with the basal spot. ‘The legs are 
normal, the fore tibiae not swollen. I believe that Enderlein is right in regard- 
ing Ochrops Szilady as a synonym of Atylotus. A comparison of specimens of 
T. plebejyus and T. bicolor shows that the two are very closely allied. I am also 
unable to accept Dasystypia Enderlein as distinct from Atylotus, as the close 
relationship of 7’. rusticus to T. bicolor and T. plebejus is evident.2, The pres- 
ence or absence of an appendix to the fork of the third longitudinal vein, 
used by Enderlein to separate Atylotus and Dasystypia, is altogether too 
trifling and variable a character, often hardly of specific value. Most of the 
small Ethiopian species with more or less hairy eyes, placed by Surcouf in his 
fourteenth and sixteenth groups, appear to belong in Atylotus, viz., T’. albipalpus 
Walker, 7’. ditaeniatus Macquart, T’. fuscipes Ricardo, T. diurnus Walker, 7’. 
fulvianus Loew, T. chevaliert Surcouf, T. tenuicornis Macquart, T. capensis 
Macquart, 7’. taeniatus Macquart, 7. laevifrons Loew, T. vexans Loew, T. 
crocodilinus Austen, and 7’. pertinens Austen. 
Szilady, in attempting to correct Enderlein’s misinterpretation of Therio- 
plectes, has only added to the confusion. He overlooked Coquillett’s earlier 
designation of the type of T'herioplectes as Tabanus tricolor Zeller. Since he re- 
gards T’. tricolor as a mere variety of 7’. gigas Herbst, Sziladya Enderlein can only 
be a synonym of Therioplectes Zeller. In redefining Therioplectes, Osten Sacken 
designated no type nor did he attempt to list the European species that remained 
in that genus. He merely removed to Atylotus the two species, 7. fuluus Meigen 
and 7. rusticus Linnaeus, which Zeller had included in Therioplectes. Moreover, 
Szilidy’s Therioplectes corresponds to Sziladynus Enderlein, which, as shown 
above, may be regarded as subgenerically distinct from Therioplectes Zeller. 
4, Ateloza Enderlein is, according to the description, based upon a Tabanus 
1 Surcouf’s (1924, ‘Les Tabanides de France,’ p. 92) subgenus Therioplectes likewise is Sziladynus 
Enderlein and not Therioplectes Zeller; while his subgenus Atylotus covers part of Enderlein’s Sziladya. 
2 Szilddy (1926, Zoolog. Anzeiger, LX VI, p. 327) also synonymized Dasystypia with Ochrops. 
8 Szilddy, Z.1927. ‘Ueber Enderleins Bremsengattung Sziladya und Sziladynus.’ Zoolog. Anvereen, 
LXXIV, pp. 202-205. 
