1925] New Nemestrinidce from Rhodesia and New Guinea 21 
shiny (except medially) and finely alutaceous; in addition there 
is on the posterior third of the tergite on each side a short, narrow 
and rather shallow, transverse groove, where the integument is 
also shiny and alutaceous. Third, fourth, and fifth tergites of 
about equal length, each on the sides, shortly behind the an- 
terior margin, with a short, transverse shiny groove similar to 
that found on the hind third of the second tergite. The apical 
tergites are much shortened and somewhat retracted ventrally; 
they end in a prominent knob containing the large genitalia. 
Legs long and stout; the hind legs considerably longer than the 
anterior and middle pair. Fore and mid femora moderately 
and rather uniformly swollen, much thicker than the tibiae; 
hind femora elongate club-shaped, distinctly swollen toward 
the apex. Tibiae slender, not appreciably thickened at the apex. 
Tarsi short, narrower than the tibiae. 
Wings (Fig. 26) long and moderately wide, over three times 
as long as the greatest width, which lies at the apex of the anal 
cell. The fore margin quite straight; the hind margin wavy 
between the tip of the fifth longitudinal vein and the apex of the 
wing: of the two, deep sinuations the proximal one, between the 
tips of the diagonal and fifth veins, is much the longest. Alula 
small, but quite well developed (as figured by Lichtwardt for 
N. horni and allies). Epaulet and basicosta clove-brown. 
Wings of a deep brown, opaque color, with a distinct cinnamon 
red tinge. A whitish hyaline, narrow, somewhat curved, longi- 
tudinal streak, with a pearly sheen, occupies the center of the 
fourth posterior cell (the cell immediately below the discal 1 ); 
it begins quite a distance from the base of the cell, where it is 
widest, and gradually tapers to a short distance from the diagonal 
vein. There are no other well-marked hyaline spots; but the 
center of the combined first and second posterior and of the 
second basal cells is distinctly subhyaline and there is even a 
faint indication of a hyaline area in the second basal cell. The 
two wings are exactly alike in this respect. Veins bright reddish 
x In Nycterimyia there are only four posterior cells differentiated. To 
make the nomenclature of the wing homologous with that of the majority of 
Nemestrinidae which have five posterior cells, it is necessary to assume that 
the first and second are fused; the cell here called the fourth then corresponds 
to the cell of the same name in Prosoeca, for example. 
