274. G. H. BISHOP’ 
From the line of division of these two areas, marking the outer 
limits of the bursa proper, the ventral wall of the bursa, in the 
closed condition of the parts, envelops closely and lies in contact 
with the base of the sting (7); posterior to this line the tract 
opens out into a considerable cavity, enclosing the shaft of the 
sting and the tip of the rectum. The base of the sting fitting 
the bursa is slightly bilobed; that is, its two halves are separated 
by a flattened furrow, which runs up around the anterior surface 
of the sting’s base, and forms the posterior and dorsal wall of 
the bursa. The anterior and ventral wall of the bursa (the 
membrane above mentioned) is correspondingly sculptured into 
two cup-shaped areas (b) symmetrically disposed on either side a 
median ridge (f), which ridge extends from the midpoint of the 
posterior margin of the bursa to the vaginal orifice, and fits 
the furrow along the sting’s base. From either cup-shaped half 
of the bursa opens anteriorly a bursal pouch (c), by a slit with 
erenelated margins (d). The bursal region of the tract slants 
dorsally and anteriorly, and narrows laterally to the vaginal 
orifice (e). 
Of this orifice, the lower margin is the most prominent, and 
consists of a V-shaped lip, the lower point of which is continuous 
with the median elevation of the ventral bursal wall (fig. 1, A). 
The dorsal margin of the orifice, a lesser elevation, lies in the 
groove of the sting’s base aforementioned, and comprises but 
a. slight distortion of the smooth dorsal wall of the tract. 
The remainder of the sexual tract, the vagina proper, may be 
described here, since no complete description has been noted in 
the literature, although its elaborate sculpturing appears to be 
more concerned with oviposition than with copulation. 
Just anterior to the vaginal opening, the first region of the 
tract (g) widens out considerably and extends horizontally for- 
ward for a short distance without significant modification. The 
next region (/h) gives rise dorsally, from a cone-shaped prominence, 
to the duct and sperm pump (2) (described fully by Bresslau) 
leading to the spermatheca. Ventrally a tongue-shaped lobe 
extending from the ventral floor of this region fits, in the collapsed 
state of the organs, into the cone-shaped protrusion at the mouth 
