distinguished from all other blood-sucking Diptera with which 

 confusion could possibly take place (especially from those belonging to 

 the genera Stomoxys, Fig. 2, and Haematopota, Fig. 3, which are most 

 likely to be mistaken for them), by the fact that the wings lie closed 



Fig. 2. Stomoxys calcitrans, L., in resting attitude, showing the position of 

 the wings. (Partly diagrammatic. x3. After Austen. Reproduced by per- 

 mission of the Trustees of the British Museum.) 



flat over one another down the back, like the blades of a pair of scissors, 

 while the proboscis (i.e., the proboscis ensheathed in the palpi) 

 projects horizontally in front of the head (see Fig. 1)" (Austen, 3). 1 



"As already mentioned, species of Stomoxys and Haematopota are 

 most likely to be mistaken for Glossina, and apart from these confusion 



Fig. 3. Haematopota vittata, Lw. (Tropical Africa), in resting attitude, 

 showing the position of the wings, the markings on which are omitted. (Partly 

 diagrammatic, x 3. After Austen. Reproduced by permission of the Trustees 

 of the British Museum.) 



can hardly take place. The members of both genera are greedy 

 blood-suckers, and often torment human beings and domestic animals 

 very greatly. Although Stomoxys also has a prominent proboscis, it 



1 With the object of avoiding a multiplicity of footnotes, and constant 

 repetitions, throughout this work references to authorities are indicated by 

 numbers in round brackets, which refer to the bibliography at the end (pp. 165- 

 178). 



