101 
SUPPLEMENTARY NOTES ON THE TSETSE FLIES 
(GENUS GLOSSINA, WIEDEMANN) 
BY 
ERNEST E. AUSTEN* 
ZOOLOGICAL DEPARTMENT, BRITISH MUSEUM } AUTHOR OF l A MONOGRAPH OF THE TSETSE-FLIES,* ETC. 
SINCE the publication of A Monograph of the Tsetse-Flies a little more than a year 
ago, our knowledge of these interesting insects, so important to the student of 
African trypanosomiasis, has been extended in various directions. It has, 
therefore, seemed advisable to embody these additions in a short paper, which it is 
hoped may not prove altogether unworthy ot the attention ot the members of this 
Section, and may serve to bring the author's Monograph so far as possible up to date. 
In the work in question seven species of Tsetse-flies were recognized and 
described. But within the last few months an eighth species has been described under 
the name Glossina decorsei, by Dr. Emile Brumft, from specimens recently obtained 
by Dr. Decorse on the River Shari and the shores ot Eake Chad.' An examination 
of some of Dr. Decorse's specimens, however, kindly submitted by Dr. Brumpt, shows 
that the supposed new species is in reality none other than Glossina tachinoides (West- 
wood), which was described as long ago as the year 1850. In his Monograph, Glossina 
tachinoides was regarded by the present author as a variety of Glossina palpahs 
(Robineau -Desvoidy), the species that, since Colonel David Bruce's investigations 
in. Uganda last year, has become widely known as the disseminator of Trypanosoma 
gambiense, now recognized as the cause ot sleeping sickness. The study of further 
material, however, and especially ot a long series ot specimens obtained two months 
ago on the Benue River, Northern Nigeria, by Mr. W. F. Gowers, and kindly pre- 
sented by him to the British Museum, shows that G/ossina tachinoides (Westwood) is 
in reality a perfectly distinct species, nearly related to Glossina pallidipes (Austen) but 
distinguishable at once, apart from its much smaller size, by the fact that the hind 
tarsi are either entirely dark, or, as in the female, are dark with the bases of the first 
three joints usually pale. The total number of species of Tsetse-flies now known 
* Reprint,;/ by permission of tit-: publishers of the British Medical Journal, August, 1904 
