54 THe BLOWFLIES OF NorTtTH AMERICA 
tube. In Rhyncomyia the common. oviduct is short while in 
Phormia it is somewhat elongate. In Cynomyopsis it is nearly 
twice as long as a single egg. In Melanodexia it is as long as the 
preuterus. 
The spermathecae are small, three in number, and lie dorsad 
of the common oviduct, usually two more or less united on 
the right, and one on the left side. They are united to the utero- 
vagina by long, thin, spermathecal ducts, one to each sperma- 
theca. In Rhiniinae (Rhyncomyia) these ducts are long and 
slender. In Chrysomyinae they are short in Callitroga but as 
long as the spermathecae in Protophormia. In Calliphorinae two 
are united in Calliphora, but this is not so in Cynomyopsts and 
Cyanus. In the latter two genera they are elongate, subcylin- 
dric, in thin tissue hoods, their ducts nearly as stout as the sper- 
mathecae, and nearly three times as long. In Lucilia and Mel- 
anodexia they are enclosed in thick hoods, and two are in a 
double head and have their ducts united; in Lucila the latter are 
curled in the middle, while in Melanodexia they are straight, and 
in both they are nearly as long as the common oviduct. 
The uterovagina is usually a wide, horizontally directed canal 
into which the ‘‘saeculus’’ (of Lowne) passes. The anterior two- 
thirds is often called the uterus; and the posterior one-third, the 
lining of which is entirely sclerotized, is often termed the ‘‘va- 
gina.’’ Except in the Mesembrinellinae, there is no typical 
‘‘uterus’’ in the ealliphorid flies so far as I know, although it 
has been stated that females of Onesia have a double-sac type of 
uterus. In Pollena and Melanodexia the uterovagina bears a 
pair of elongate, oval vesicles behind the origin of the sperma- 
thecae, and each of these contains a strong, curved, sclerotized 
rod; this is not so sharply pointed in the latter as in the former. 
In the Calliphorinae, Rhiniinae, and Chrysomyinae the utero- 
vagina is simple and regular. 
The accessory glands are two elongate cavities surrounded by 
a thick, transparent, medially united, sclerotized capsule, and 
these open on the dorsal wall of the preuterus which forms a 
large tuberosity. In Rhyncomyia they are elongate and club- 
like. In Callitroga, Phornuia, and Apaulina they are swollen at 
the free end, and in the latter genus they are six times as long 
the spermathecae. In Calliphora they are elongate, often swollen 
terminally; in Cynomyopsis they are longer than the common ovi- 
duct and a little stouter than the spermathecal ducts except at 
the broadened tips. In Melanodexia they are half again longer 
than the common oviduct, convoluted, their ducts almost as long 
as the glands, 
