531 
Report on the Anatomy of the Tsetse-fly (Glossina palpalis). — 
By E. A. Mincutn, M.A., Professor of Zoology and Comparative Anatomy in 
University College, London, late Fellow of Merton eee a 
(Communicated by Professor E. Ray Lankester, F.R.S. Received 
August 17, Hee) 
The following description is based upon dissections and preparations made 
‘in the laboratory of the Sleeping Sickness Commission at Entebbe since my 
arrival here at the beginning of April. I hope on my return to England to 
work up my material into a detailed memoir on the anatomy and histology. 
Time does not suffice for me to complete my work out here, but it seemed 
worth while, nevertheless, to bring forward as soon as possible a brief 
description of the general anatomy of the fly, and especially of its digestive 
tract, on account of its importance for the study of the evolution of the 
trypanosomes of Sleeping Sickness, and other tsetse-fly diseases, within the 
body of their invertebrate host. 
In this paper I do not propose to attempt to deal with either the muscular 
system or the respiratory tracheal system. The former of these is so complex 
that much more time would be required for working it out than I could afford 
to spend, and it is, moreover, of little or no importance for the aim in view ; 
while the tracheal system, or at least its finer branches, are so intimately 
connected with the fat-body, which here, as in other insects, fills up the body- 
cavity, that in the process of clearing up and laying bare the organs, the 
trache are for the most part removed. Special muscles or trachez will be 
mentioned in places, but otherwise no account will be taken of these two 
systems. 
The drawings illustrating this memoir are to be regarded as semi- 
diagrammatic, but all details in them have been traced from sketches made 
with the camera lucida from actual dissections, and therefore claim to be true 
to nature and accurate as regards scale and proportions. For help in the 
preparation of these drawings I am much indebted to my colleague, Mr. F. 
Tulloch, R.A.M.C., who also kindly cut some sections for me. Mr. Tulloch 
has also made some dissections of Stomoa ys, comparison with which has 
thrown light on some points in Glossina ; Mr. E. Degen, who came out with 
me, has also helped me in various ways. | 
Since I have no access out here to any literature or works of reference 
dealing with insect-anatomy, I am unable to make this account comparative, 
