CHAPTER II. 



THE EXTERNAL CHARACTERS OF THE GENUS 

 GLOSSINA. 



Genus GLOSSINA. 



Glossina, Wiedemann, Aussereuropiiische zweifliigelige Insekten, Zweiter 

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

 sur les Myodaires (Memoires present6s ... a 1' Academic Royale des 

 Sciences de I'lnstitut de France . . . Sciences Math^matiques et 

 Physiques. Tome Deuxieme), pp. 389, 390 (1830). 



Narrow-bodied, elongate, dark brown, blackish, ijellowish-hrown, 

 or yellowish flies belonffing to the Faynili/ Muscidae, rangiwj in size 

 from about 6 or 8 mm* in the case of Glossina tachinoides, Westw., 

 to as much as 13 or 13*5 mm.* in that of a large female ofG. brevi- 

 palpis, Netost., or longipennis, Corti ; recognisable lohen alive and at 

 rest by the loings 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 tectiform (as in Haematopota), and by the 

 proboscis (i.e. p-oboscis ensheathed in the palpi), projecting hori- 

 zontally in front of the head ; palpi, as seen in the natural position, 

 extending slightly beyond, the proboscis, their inner sides grooved so 

 as to form a sheath for the latter, to ivhich in life they are applied 

 so closely as entirely to conceal it ; base of p>roboscis suddenly 

 expanded beneath into a large onion-shaped bulb. 



Head rather narrower than the thorax ; eyes separate in 

 both sexes ; width of the front at the vertex in the ^ ranging 

 from one-third to rather more than one-half of that of the eye at 

 its widest part, and in the 9 fi'oi^^ one-half to rather more than 



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

 the proboscis and \vings. 



