
1905.] Anatomy of the Tsetse-fly (Glossina palpalis). 543 
armature of hooks, spines, hairs, and semaphore-like erectile flaps, which 
would require so many figures to make their arrangement and relations clear, 
that I refrain at present from attempting any description of them. 
The female genital organs differ considerably in appearance according 
as they are in the gravid or non-gravid condition. In the course of my 
dissections I have only found one female in the latter state. In the later 
periods of gestation the condition of the female is obvious externally, but 
females which do not appear to be gravid are found on dissection to have a 
small larva in the uterus. 
The female organs (fig. 6) consist, like the male, of paired and unpaired 
portions. The former comprise the ovaries, the receptacula seminis and 
their ducts, and the uterine glands; the latter are the oviduct, uterus, and 
Fia. 6. Fia. 7. 
_ rec. sem. 
i ae _-7 OV.e. 


2 = rec. 
ov.| ---- 

x 78. 


EAE ay S , te 
C3 CE aN ---Mmvag. 
amet S g 

x 75, 
Fig. 6.-The Hinder Segments of the Abdomen with the Female Genital Organs 
in situ, dorsal view. 
rec. sem., receptacula seminis ; ov., 7., ov. l., right and left ovarioles ; d. rec., duct of the 
right receptaculum seminis ; gl. wé., uterine glands (the greater number of these have 
been removed) ; c. d. gl., their common duct; retr. ut., retractor muscle of the uterus ; 
Od., oviduct ; Ut., uterus; Z., hinder extremity of the larva, causing a bulge in the 
uterus ; pro. ut., protractor uteri, attached to the chitinous plate (CA. 1); m. vag., muscle 
(dilator vagine?) passing from the vagina to the tergum of the seventh abdominal 
segment; m. v., muscle passing from the paired chitinous plate (Ch. 2) on each side of the 
vulva to the seventh tergum ; Vag., vagina; V., vulva, the anterior margin of which is 
shown by a dotted line; An., anus ; Ch. 1, Ch. 2, paired chitinous plates. 
Fie. 7.—The Ovarioles and Oviduct of a Non-gravid Female. 
a. Ov., apex of right ovariole ; other letters as in the preceding figure. The very large 
ovum in the right ovariole has pushed the oviduct over towards the left side of the body. 
VOL, LaxVi—BrB. 20 
