4: DISTINCTIVE CHAEACTEES OF 1\SETSE-FLIES. 



while the p-oboscis (i.e. the proboscis enshcathed in the palpi) 

 projects horizontally in front of the head (see Fig. 2). As 

 pointed out by Col. Bruce, the closed wings thus give the fly "an 

 elongated appearance" (Cf. Chapter VII., Appendix A, p. 271 ; 

 see also 55, 76, II9, 152, 161).* Measured from the tip of the 

 proboscis to the end of the closed wings the length of Glossina 

 morsitans is about half an inch ; that of 67. fusca about three- 

 quarters of an inch. 



Most writers who haA-e attemjited a description of the Tsetse 



A Tsetee-fly (Gtosfina (ojw/i'jiouiis, Corti, from yonialilnnfl) in resting attitude, 

 showing the position of the wings, (x 4.) 



have stated that it is rather larger than the common house-fly, 

 hut the comparison is somewhat unfortunate, since few people, 

 other than trained Dipterists, are capaV^le of recognising the 

 true house-fly (Mtisca domestica, Linn.), Moreover, at least two 

 other species of Muscidas, Homalomyin cnnicularis, Linn., and 

 Gyrtoneura stahidans, Fin., are quite common in houses in Europe 

 ivt certain seasons ; the latter of these is considerably larger than 



* The numbers refer to the Bibliography (Chapter VI.). 



