294 MEDICAL ENTOMOLOGY 



DIATOMINEURA, Rondani, and CORIZONEURA, Rondani, are found in 

 the Ethiopian region, the latter also in the Oriental region. They are not 

 aggressive blood-suckers, and are found in well-wooded districts. 



Genus DoRCALOEMUS, Austen. The flies of this genus have bare eyes 

 and have the posterior cell closed. They are not aggressive biters. The 

 genus is limited to South Africa. 



Genus RHINOMYZA, Wied. This genus has a superficial resemblance 

 to Chrysops. The antennae, however, resemble those of Tabanus, the 

 basal hook being well marked. Ocelli are present, and the hind tibiae 

 have spurs. They are found in Africa, Java and South America. 

 Neave states that they frequent shady places and feed most frequently in 

 the evening. 



The remaining genera of the Tabanidae are distributed as follows : 

 Udenocera, Ricardo, Ceylon. Neotabanus, Ricardo, Ceylon. Diach- 

 lonts, Osten Sacken, North and South America and the 

 phili PP ines - Lepidoselaga, Macquart, Brazil, Australia 

 and Chili. Stibasoma, Schiner, Brazil. Dasybasis, 

 Macquart, Australia and Chili. Bolbodimyia, Bigot, Venezuela. Acan- 

 thocera, Macquart, South America. Dichelacera, Macquart, South 

 America. Apocampta, Schiner, Australia. Dicrania, Macquart, Brazil. 

 Pityocera, Gigl-Tos, Central America. Goniops, Aldrich, North America. 

 Apatolestes, Williston, North America.- Pelecorhynchus, Macquart, 

 South America and Australia. Pronopes, Loew, Cape of Good Hope and 

 Java. Esenbeckia, Rondani, Brazil. Gastrixodes, Saunders, India. 

 Adersia, Austen, South Africa, Aegophagamyia, Austen, Zanzibar, 

 Rodrigues, and Astove Islands ; British East Africa. Bovierella, Surcouf, 

 Madagascar. Scepsis, Walker, South America. Selasoma, Macquart, 

 South America. Scione, Walker, Seychelles, South America and 

 Australia. 



When studying the feeding habits of the blood-sucking Tabanidae 

 it is useful to have a tame cow or horse, and to tether it in a field or 



some well-wooded place in the vicinity of water in a 

 Bionomics of the , r , , u ,, n- i 



T . . . locality in which the flies are known to occur. In a 



short time one or more of the females will alight on it 

 and commence sucking blood. The different species which have been 

 observed under such conditions in Madras show a remarkable peculiarity 

 in the selection of the site from which to feed. T. specious and T. albi- 

 medius almost invariably settle low down on the back of the hind leg, 

 while T. striatus and T. hilaris frequently select the same site, but may 

 also be seen biting on the under surface of the abdomen, particularly on 



