104 GL. LONGIPENNIS: DISTINCTIVE CHAEACTEllS. 



his original description Corti {lor. cit., p. 139) states that the 

 specios is allied to Gl. tachinoides, Westw. ( = GL palpalis, K.- 

 Desv., var. tachinoides, Westw.), to which of course it is in reality 

 by no means closely related. As already stated in dealing with 

 Gl. fusca, Walk., the latter species, with the one under dis- 

 cussion, " forms a group which, by reason of the considerably 

 larger size of the individuals, contrasts strongly with the other 

 species of the genus at present known." 



Apart from all other characters, Glossina longipennis is 

 readily distinguished from Gl. fusca by the ocellar spot being 

 dark brown and therefore very conspicuous, and by the presence 

 of the four dark brown oval spots on the dorsum of the thorax. 

 These dark brown spots are perhaps remnants of the dark 

 patches enclosed in the curved stripe in the complete scheme of 

 thoracic markings in the genus Glossina, as described above in 

 the case of Gl. palpalis ; but they are so much darker than the 

 remaining very faint and vestigial markings on the dorsum of 

 the thorax in Gl. longipennis that they appear as altogether 

 independent markings. 



It must be observed that the wings in the present species are 

 not noticeably longer in proportion to the size of the body than 

 are those of any other species of Glossina. On the other hand, 

 the proboscis (i.e., palpi and proboscis) is remarkably short — 

 actually considerably shorter than in Gl. fusca, and relatively 

 shorter than in any other species of the genus,* so that hrevirostris 

 would have been a much more appropriate designation. 



Lastly, it should be noted that in both sexes of Gl. longipennis 

 the front is considerably broader than in Gl. fusca. 



* It says much for the discernment of the late Captain A. J. Haslam, 

 whose untimely death cannot be too greatly deplored, that he should have 

 noticed this in the field. As has already been mentioned, Captain Haslam, 

 while acting as Transport Officer to the Uganda Railway in 1898, collected 

 and forwarded to the British Museum specimens of Glossina pallidipes 

 fusca, and longipennis, and it is therefore to Gl. pallidipes and Gl. 

 longipennis that the following observation, taken from his letter of 

 16.4.1898, must be held to apply : " It is seen that the proboscis of the 

 smaller ones is larger in proportion to the body than the proboscis of the 

 larger flies is to their bodies." 



