48 Tue BLOWFLIES oF NortH AMERICA 
Within the segments lie the genitalia proper, the whole com- 
plex of structures beyond the fifth abdominal segment being 
termed the terminalia. It has also been called the postabdomen, 
hypopygium (which term should actually be applied only to the 
anal plate), genitalia and many other terms. In the present pa- 
per the parts composing the terminalia are referred to as the 
genital segments (Fig. III). 
GSI ~=GSII 
a 
AC) AHPH = PRPAIPPAP GME 
Fig. III. Calliphora vicina Robineau-Desvoidy. Male genital segments, 
sclerotic morphology. 
A. Apodeme. IF. Inner forceps. 
AC. Anterior gonapophysis. OF. Outer forceps. 
B. Phallobase. PC. Posterior gonapophysis. 
EP. Epiphallus. PP. Paraphallus. 
GSI. First genital segment. PRP. Praeputium. 
GSITI. Second genital segment. V. Vineulum. 
HPH. MHypophallus. 
When genitalia are exposed to view, the most obvious in- 
ternal appendage is the phallosome (P), which is a sclerotic and 
membranous tube, the various sclerotized areas of which appar- 
ently do not change materially in position, and within which 
lies the apical portion of the ejaculatory duct. The phallosome 
may be divided into three rather distinct portions: the phallo- 
base (B); the middle portion, or paraphallus (PP); and the 
apical or terminal portion, or praeputium (PRP). 
The phallobase is short and heavily sclerotized and bears pos- 
teriorly a single long thinly-sclerotized process, the epiphallus 
