588 JiK. A. M. ALTSON ON THE 
double-jointed vaginal palp (p), which bears a number of sensory pits. The 
inner lateral faces of the palps are concave. Within each basal piece is a 
short forked rod (/V); ^"'1 articulating between the prongs of the foi'k and 
running back some distance is achitinized rod (rd) (" Seiten stuck/' Stein 11). 
The abdominal nerve-ganglion and commissures are not depicted ; the latter 
were only traced to the venter of the spermatheca and to the valve. 
The left top corner of PI. 32. fig. 1 depicts a portion of the mesenteron (ms) 
terminating in the ileum (Jni), from which arise six malpighian tubes {iiip). 
The ileum, which is lined with chitinized setae at its junction with the 
mesenteron, is followed by the colon {cl), which leads into the rectum (r). 
The rectum, which is of muscular structure, is visible for a considerable 
length before it — like the comnion oviduct — disappears into the "ovipositor." 
(In this figure the rectum has been pulled across to the left : it should lie 
looped over the " ovipositor " and enter from the right as in PI. 33. fig. 2.) 
PI. 34 depicts the "ovipositor" in section. Figs. 4, 5, 6, and 7 are camera 
lucida drawings of transverse sections from an "immature" female. Fig. 4 
shows the rectum (r) entering the inner sheath (ins) of the ovipositor from 
the right and assuming a position dorsal to the common oviduct (co), which 
enters from under the loft. In fig. 5 the rectum (r) is now dorsal to the 
common oviduct (co), and both are completely enclosed by the inner sheath 
or distal portion (ins) of the " ovipositor," which in turn is enclosed within 
the outer sheath {ots). In fig. 6 the rectum (»•) is seen emerging through the 
dorsal wall of the distal portion of the " ovipositor " ; whilst in fig. 7 the 
rectum and anus {an} are now free of the inner sheath, which^ at this point, 
becomes the integumental covering of the apex of the common oviduct (co) 
or bursa copulatrix. 
Fig. 8 is a transverse section through the apex of the " ovipositor " of a 
fertilized female which had begun egg-laying. The section is about the 
beginning of the vaginal orifice (vo) ; it shows the stout outer lateral wall of 
the basal pieces [bp) and transverse muscles to allow of expansion. 
Figs. 1, 2, and 3 are partially reconstructed camera lucida drawings of 
longitudinal sections of the " ovipositor " of a fertilized female that had been 
ovipositing. Fig. 1 shows the junction (jo) of the inner and outer sheaths, 
and the entry of the couimon oviduct from underneath to the ventral surface 
of the inner sheath and the position of the rectum. Fig. 2 is of a median 
section of the "ovipositor" showing the rectum convoluted (re). Fig. 3 is 
a section through that part of the " ovipositor " where the rectum (»•) emerges 
through the inner sheath. 
The relative positions occupied by the genitalia and alimentary tract within 
the abdomen, meta- and mesothorax are depicted in PI. 33. figs. 1, 2, and 3. 
No muscles are shown, as their inclusion would obliterate a large part of 
these orgnns. it will be seen that the female possesses an apodemc (aji) of a 
similar structure to that described in the male. The figs. 1 and 3 are based 
