105 



CHAPTER V. 



THE MOUTH-PARTS OF GLOSSINA AND STOMOXYS. 



(Plates VIII. and IX.). 

 By Dr. H. J. Hansen (Copenhagen). 



The Glossina material investigated by me consisted of four 

 specimens belonging to three species, viz., a male and female of 

 Gl. pallidipes, Austen, and males of Gl. morsitans, Westw., and 

 Gl. fusca, Walk.* All the specimens were dried ; the heads I 

 boiled in water and examined as well as possible, after which 

 three of them were cleaned in a cold solution of caustic potash, 

 so that the chitin could be better studied. For comparison I 

 have also examined some spirit specimens of the common 

 European blood-sucking form Stomoxys calcitrans, L., and one 

 dried specimen of an African species of the same genus, f After 

 the examination of St. calcitrans I was able to find nearly all 

 the same muscles in the boiled specimens of Glossina, but it is 

 of course impossible to discover and study such organs as small 

 glands, nerves, etc., in specimens which have been preserved in a 

 dried condition. In the following pages I furnish a description 

 of the essential features of the external and internal mouth-parts, 

 and attempt to show how the animals bite and pump the blood 

 into the alimentary canal. Neither the very short time (nine 

 days) available for my investigation, nor the quality of the 

 material of Glossina, permitted me to make a more special study 



* The labels attached to the specimens were as follows : — Gl. pallidipes, 

 Austen, <? : " Kilima-Njaro, P. J. Jackson"; Gl. pallidipes, Austen, 9 : 

 " Witu Forest, 1895, Sultan of Witu, per W. S. Godfrey" ; Gl. morsitans, 

 Westw. i : "Beira Railway, Lower Pungwe River, Portuguese East 

 Africa, Oct. 1897, G. A. K. Marshall, — ' Flew into railway carriage at 

 night attracted by light ' " ; Gl. fusca. Walk. : " Witu Forest, 1896, Sultan 

 Witu, per W. S. Godfrey." 



t This specimen bears the label; " Pcmba Island, East Africa, 

 26. vjii. 1899, D. R. O'Sullivan Beare." 



