THE ANATOMY OF THE PROBOSCIS 
OF BITING FLIES 
BY 
J. W. W. STEPHENS, M.D. Cantab. 
AND 
R. NEWSTEAD, A.L.S, F.E.S. 
( Received May nth, 1907) 
PART II.* STOMOXYS (STABLE FLIES) 
As far as we are aware, there have been only two descriptions, in 
recent years at least, of the anatomy of the mouth parts of Stomoxys. 
I he first, by Hansen, 1 is, as far as it goes, a good and accurate 
account, but it is incomplete in many respects, even in regard to 
important structures, which we should have thought it impossible to 
overlook. Moreover, sections were not cut by this author, and without 
these, it is, in our opinion, impossible to understand the relationship of 
the parts. The second description is by Giles. 2 . We feel bound to 
point out that this account is misleading and inaccurate ; and that 
the same criticism is equally applicable to his description of 
Glossina (/. c.) 
Methods. — For section cutting we find that a combined celloidin- 
paraffin method gives the best result. In this way it is possible to get 
intact sections of the chitin, otherwise a difficult matter. Owing to 
the opacity of the proboscis, examination with high powers, of 
specimens mounted in toto, is almost impossible ; but the whole 
proboscis can be rapidly rendered transparent to any desired extent 
by bleaching in chlorine gas : the chitin not being at all affected. 
* Glossina (Tsetse-flies), was published in Memoir XVIII, 1906, Liverpool 
School of lropical Medicine. 
