62 THE BLOWFLIES oF NortH AMERICA 
Female Mesembrinellinae produce second-instar larvae and 
the female reproductive system (Fig. VI) is modified for this 
purpose. It appears somewhat different from the type found in 
Calliphora, but most of the parts are homologous. The postab- 
dominal segments (pl. 10, A) are modified to allow for the de- 
position of large larvae and there is no telescopic sclerotized and 
membranous ovipositor. Tergites 1 to 5 are asin Calliphora; ster- 
nites 1 to 5 are very small and the ventral membrane is obvious. 
QIAN 
Fig. VI. Huascaromusca bicolor (Fabricius). Internal reproductive 
system of female. 
AG. Accessory gland. OD. -Ovarian duct. 
CO. Common oviduct. R. Rectum. 
GO. Genital opening. S. Spermatheca. 
O. Ovary. U. Uterus. 
Tergites 6 and 7 are united and have two pairs of spiracles; 
tergite 8 is strongly sclerotized; tergite 9 is less strongly 
sclerotized and has a marginal-row of macrochaetae; this is the 
last obvious abdominal tergite. The anus is located above a 
strongly-selerotized, flattened plate which appears similar to, 
and possibly is, a sternite, and between a pair of terminal para- 
procts; the genital opening is located immediately below and is 
surrounded by membrane capable of considerable distention. 
The uterus is of the simple, sac-like, incubating type, com- 
posed of thin white membrane capable of remarkable distention; 
