48 DIPTERA 
. 12. GENUS IRONOMYIA, WHITE 
Ironomyia, White, Pap. Proc. Roy. Soc. Tasmania, 1916, p. 216 (1917). 
Characters. — Head broader than the thorax; eyes of male contiguous; proboscis scarcely 
projecting, palpi rounded and shorter than the proboscis; antenna about one-fourth the length of the 
head, the first joint hardly distinguishable, the second a little longer than broad, the third rounded, 
arista thread-like, about twice the antennal length. Thorax only slightly arched, with a few weak 
posterior bristles, scutellum with weak marginal bristles. Abdomen short conical, male genitalia incon- 
spicuous. Legs short, practically bare, tibiae and tarsi subequal, tibie thin at the base, gradually 
thickening to the apex, ungues unusually large, three equal bristles between the well developed pulvilli. 
Wings broad, costa convex and serrated, auxiliary fused with first vein, which is long, reaching to the 
sharply defined stigma, second vein unusually long, at first well separated from the third after which the 
two veins converge, almost meeting below the stigma, and then slightly diverge, reaching the margin 
close together a little above the wing-tip, third vein unforked, discal cell long, emitting three veins, . 
four posterior cells, the three basal cells short, the first a fraction longer than the second, the anal cella 
little longer than the first, hind angle of wing strongly developed. 
Genotype : I. nigromaculata, White, the only known species of this curious genus. This species 
is black, with abdomen centrally gray but marked with a dorsal row of black spots and was taken on a 
tree trunk in Tasmania. 
Geographical distribution. 
1, I. nigromaculata, White, Pap. Proc. Roy. Soc. Tasmania, 1916, p. 217, Tasmania. 
f. 39 (1917). — PI. 8, Fig. 86. 
I3. GeNUs SCIADOCERA, WHITE 
Scladocera, White, Pap. Proc. Roy. Soc. Tasmania, 1916, p. 218 (1917). 
Characters. — Head placed low down below the greatly arched thorax ; eyes of female very 
widely separated ; proboscis concealed within the oval aperture; antennae so short that the very large, 
almost quadrangular terminal joint seems to lie directly against the face, the third joints of the two 
antenna touching on the inner margin and reaching to the eyes on the outer margin, covering the face 
.and completely concealing the preceding joints, arista thread-like; front with six stiff bristles — a diver- 
gent pair at the center of the vertex, a single one on each side close to the eyes, and one lower down 
above each antenna. Thorax with three complete rows of small dorsal bristles and well marked 
humeral, posthumeral, notopleural, supra-alar and postalar bristles, scutellum with four long marginal 
bristles, Abdomen about equal in breadth to, buta little longer than the thorax, altogether without: 
bristles, Legs of medium length, bearing a few bristles, coxze considerably lengthened. Wings large, 
unusually broad, the costa strongly convex, auxiliary vein fused with the first vein, which ends at middle 
of wing, third vein not forked, discal cell open above and outwardly, four posterior cells indicated at 
the margins, the first two posterior veins incomplete basally, basal cells $hort, equal, anal cell a little 
shorter, no stigma. 
Genotype : S. rufomaculata, White, the only known species. This is a yellowish-brown insect, 
four millimeters in length, with the black abdomen marked with four pairs of orange-red spots. 
Geographical distribution. 
1. S. rufomaculata, White, Proc. Roy. Soc. Tasmania, 1916, p. 219, f. 40(1917). Tasmania. 
