142 ENTOMOLOGY 
minates in the intromittent organ, or penis. Often each vas 
deferens is dilated near its mouth into a seminal vesicle, or 
reservoir; or there may be only a single seminal vesiele, aris- 
ing from the common duct. One or more pairs of glands 
opening into the vasa deferentia or the ductus ejaculatorius 
secrete a fluid which mixes with the spermatozoa and often- 
times unites them into packets, known as spermatophores. 
All these parts are subser- 
vient to the formation, pres- 
ervation and emission of the 
spermatozoa. ‘These minute 
thread-like bodies (Fig. 180) 
arise in the testicular follicles 
from a germinal epithelium, 
and consist, as in vertebrates, 
of a head, middle-piece and 
a vibratile, tai/—without en- 
tering into the finer struc- 
LUTE. 
Female Organs. — Each 
ovary (Fig. 181) consists of 
one or more tubes opening 
into an oviduct. The two 
oviducts enter a common 
Reproductive system of female Lepi- 
doptera. b, bursa copulatrix; f, terminal duct, the vagina, which 
filament; g, cement glands; 0, 0, ovaries; 
od, oviduct; r, receptaculum seminis; v, opens to the exterior, often 
vagina; ws, vestibule, or entrance to = . & Fi r - 
ees us, oue yvipositor.  Fre- 
bursa.—After Korse. thi - ugh ayes p 
quently the vagina is ex- 
panded as a pouch, or bursa copulatrix, though in Lepidoptera 
the bursa and the vagina are distinct from each other and open 
separately (Tig. 182). In most insects a dorsal evagination 
of the vagina forms a seminal receptacle, or spermatheca, trom 
which spermatozoa emerge to fertilize the eggs. The acces- 
sory glands, either paired or single, provide a secretion for 
attaching the eggs to foreign objects, cementing the eggs to- 
gether, forming an egg-capsule, ete. 
