62 
DIPTERA 
the cubitus wholly invisible; anal vein apparently absent; costa reaches a considerable distance 
beyond the tip of the radial sector. Tibial spurs present. Ocelli apparently absent. 
This genus bears a great resemblance to Lygistorthina, Skuse, from which it seems to differ only 
in the absence of the ocelli. The wing venation and mouth parts are similar to those figured for the 
Australian genus (PI, I , Fig. 23 ; PI. 4, Fig. 18). 
Type species : P. singularis, Williston. 
Geographical distribution of species : 
I. P. singiilaris, Williston. Trans. Ent. Soc. Lond.p.261, pi. 8, f. 1 5 (i8g6). St. Vincent Isl., W. I. 
6. Genus LYGISTORRHINA, Skuse 
Lygistorrhina. Skuse, Proc. Linn. Soc. N. S. Wales (2), Vol. 5, p. SgS (1890). 
Characters. — Head small, rounded, narrower than the thorax; exerted from'the thorax ; front 
rather narrow. Eyes large, approximate beneath; ocelli three, arranged in a small triangle on the vertex, 
the anterior one very small; proboscis very long and slender, rather more than one-half the length of the 
entire body; palpi apparently wanting; antennae porrected, cylindrical, short, 2-I-14 jointed; flagellar 
joints longer than broad, progressively diminishing in thickness, with a microscopic pubescence. Thorax 
short, ovate, very gibbose; scutellum small; metanotum large, acclivous. Abdomen slender, somewhat 
compressed from the sides, narrowed at the base and extremity, seven segmented; terminal lamellae of 
the ovipositor elongate elliptical. Legs long and slender, coxae somewhat elongate, as in Sciava, fore and 
intermediate femora slender, the hind pair dilated, a little longer than the other pairs; fore and inter- 
mediate tibiae and tarsi very slender; hind tibiae incrassated towards the apex, nearly twice the length of 
the fore pair; hind tarsi thicker than those on the other legs. Fore tibia' with one, intermediate with two 
very small spurs ; hind pair with two unequal spurs; no lateral spines. Wings shorter than the abdomen, 
moderately broad, rounded off at the base, incumbent in repose; microscopically pubescent. Costal vein 
extending much beyond the tip of the radial sector, but not reaching the apex of the wing; subcostal 
vein incomplete, very short, close to Ri ; Rj short, reaching the costa considerably before the middle of 
the wing; the radial sector arising apparently at the base of the wing, tolerably straight, terminating in 
the costa opposite the tip of the posterior branch of the media; media incomplete, the petiole and the base 
of the fork wanting; fork of the cubitus small, the anterior branch detached at the base; anal vein very 
rudimentary (PI. I, Fig. 23 ; Pi. 4, Fig. I 8). 
The insect reminds one more of the Sciaridae than the Mycetophilidae, especially in the situation 
of the head, size of the coxae, and length of Ri ; while the characters of the proboscis and venation of 
the wings afford characters very distinctive from any hitherto described genus in either family. 
Type species : L. insignis, Skuse. 
Geographical distribution of species : 
I. L. insignis, Skuse, Proc. Linn. Soc. N. S. Wales, p. 600 (463), pi. 19, Australia, 
f. I (1890). 
7. Genus ACNEMIA, Winnertz 
Acnemia. Winnertz, Verb. Zool.-bot. Ges. Wien, Vol. i3, p. 798 (i863). 
Agaricobia. Philippi, ibidem. Vol. i5, p. 626 (11) (i865). 
