The different sclerites of genitalia or
hypopygium of each species were examined and
illustrated. According to Zumpt (1973), the lateral
sclerite was divided into two parts, pregonite and
postgonite (Figure 8). In this study, the horned
sclerites were clearly distinguished among the
three species. The various sclerotized plates were
also different in shape among S. calcitrans, S.
sitiens and S. indica (Figure 9).
Oriental region. Stomoxys calcitrans was the only
one Stomoxyine fly ever recorded to be found in
Thailand as pest of cattle and swine (Ketavan and
Kanjanamungsuk, 1987). Distribution of S. sitiens
has been found in high number in the Ethiopian
geographical region, especially in Egypt and in
the Oriental region. Stomoxys indica is also quite
common in the Oriental region (Zumpt, 1973).
However, during this investigation the number of
S. sitiens was significantly grater than that of S.
indica at the three localities in central Thailand.
Stomoxys sitiens is separated from S. calcitrans
by the wing-venation and dorsal abdominal
pattern.�