438 Transactions. 
ment of the protarsi; in other forms the mesotarsus (fourth joint) is 
enlarged, or femora, tibiae, or coxae are unusually developed. The claws 
and pulvilli are well developed. 
In the wings (fig. 1) there is a certam amount of variation of shape 
and venation. The anal angle may be strongly or moderately developed 
or altogether wanting ; vein Sc either meets the costa or evanesces toward 
its apex; R, and R, either branch or are fused throughout. en 
branching, R, leaves R, at an acute or right angle, and in some cases is 
recurved to meet the costa ; in one genus (Blepharoprocta, not yet recorded 
in New Zealand) it joins R,,, and not the costa, the recurving being 
an approach to this state. In some species M, and M, are wholly or 
partially fused after leaving cell Ist M,, and when completely fused may 
mpid wings there is a spurious vein, similar to that of the Syrphidae, 
running through cells R and R,; cell Ist M, is rectangular, triangular, 
or narrowed apically, while in some genera (not yet known in New Zealand) 
it is completely wanting. - 
The abdomen is more or less robust or slender. The genitalia of the 
male vary considerably ; in some species they are more or less concealed, 
in others prominent and knob-like. The most unique forms are found 
in the genus Hilara ; in many of these flies there is a sheath-like appendage 
frequently almost as long as the body itself (fig. 2) or much shorter. А dis- 
section of this appendage—which I refer to as the “ genital appendage "— 
shows that it is the sheath of the penis, which is extremely long, the 
genitalia being attached to it on each side on the upper side at the base. 
is appendage is blade-like, being laterally compressed, and the penis, 
which is a flexible, chitinous, thread-like structure, leaves the abdomen 
ventrally and runs around the edge of the sheath, entering and projecting 
beyond the genitalia on the dorsal anterior angle of the sheath (fig. 2); 
the penis is retracted within the genitalia by being drawn upward from 
the lower edge of the sheath to the upper, as shown by the dotted line. 
When at rest the genitalia are enclosed (fig. 24) beneath the dorsal plate 
of the third-last abdominal segment, the penultimate and ultimate being 
Fic. l—bDiagram of an Empid wing, showing venation: the dotted lines represent 
_ Various positions assumed by Cu, in relation to Ist А. 
бае Fres. 2-6.—Hilara flavinceris n. sp. ii 
italia of 2, showing the sheath of the penis, or “ genital appendage 
dotted line shows position of penis sedis its apex is withdrawn; the me 
inner line represents the position of the penis. 2a. Genitalia of H. dracophy/^ 
n. sp., showing the genitalia (black) closed within the abdomen. 
Apex of abdomen, $. 
- Abdomen of ? , showing bladders inflated. 
Egg, side view. 
Egg seen from anterior end, showing micropilar projection. 
BR 
Fies. 7-10.—Hemerodromia fontanaliz n. sp., 2. 
Head, side view. 
acum of thorax, showing chaetotaxy and colour-pattern. 
ing. 
Anterior leg. 
Га) 
Pees 
