60 



CHAPTER IV. 



SYSTEMATIC DESCRIPTION OF THE GENUS GLOSSINA 

 AND ITS SPECIES, WITH NOTES ON THEIR 

 DISTRIBUTION AND HABITS. 



Genus GLOSSINA. 



Glossina, Wiedemann, Aussereuroptiische zweifliigelige Insekten, Zweiter 

 Theil, pp. 253, 254 (1830). Nemorhina, Robineau-Desvoidy, Essai 

 sur Ics jMyodaires (Memoires pr^sentes ... a I'Acad^mie Royale des 

 Sciences de I'lnstitut de Fiance . . . Sciences Math^matiques at 

 Physiques. Tome Deuxieme), pp. 389, 890 (1830). 



Narrow-hodied, elongate, dark (jreyish-hrown or yellowisJi-hrown 

 dull-coloured flies, ranging in size from 71 millim.* (3^ lin.) in 

 the case of a small specimen of Glossina morsitans, Westic, to 

 12 millim.''' (5|- lin.) in that of a large female of Gl. fusea, 

 Walk. ; recognisable ivhen alive and at rest by the wings being 

 closed flat one over the other above the abdomen (beyond which they 

 project considerably), instead of divaricate (as in the case of 

 Stomoxys) or tecttform (as in Hajmatopotaf ), and by the proboscis 

 (i.e., proboscis ensheathed in the palpi), which in length is equal to 



* Length measured from the face to the end of the abdomen, excluding 

 the proboscis and wings. 



t In the case of the genus Hieinafopota (family Tahanidve), the species 

 of which (in England often known as " clegs ") are greedy blood-suckers, 

 and, though readily distinguishable by the prominent antennae, are not 

 unlike those of Glossina in shape, size, and general colouration, the wings, 

 when the insect is at rest, are somewhat tectiform (i.e. their anal angles 

 meet together like the roof of a house), as well as slightly divaricate. 

 Dr. Kert6sz's Catalogue of Tabanidse (" Catalogus Tabanidarum Orbis 

 Terrarum Universi : conscripsit Dr. Colomannus Kert6sz. Budapestini, 

 1900 ") contains the names of some twenty species of Hmmatopota described 

 from various parts of Africa, and from specimens brought home by 

 collectors it is clear that Hiematopota is sometimes mistaken for Glonsina 

 when alive (C/. Fig. 1, p. b_). 



