Genus Mucidus. 271 
all basally white. Ungues thick, short, uniserrated ; the ungues, 
which are equal on all the legs, have spines on their sides. 
Wings with the veins densely covered with large, parti¬ 
coloured and yellow and white scales, the fringe alternately 
black and white ; the majority of the scales are half purple and 
half yellowish-brown, but on the costa and first longitudinal, 
just over the base of the fork-cell, the scales are plain yellowish- 
white, forming a distinct spot ; there are also white scales, 
Wing of Mucidus alternans, Westw. (9). (X. 9.) 
forming spots at the base of the fork-cells, on their stems, a dusky 
spot over the cross-veins and at the base of the second long vein, 
where it joins the first; posterior cross-vein a short distance in 
front of the mid cross-vein and much longer ; first sub-marginal 
cell longer and narrower than the second posterior cell, their 
bases about level and their stems, which are white scaled, shorter 
than the cells and nearly equal in length. The surface covered 
with very minute bristles. 
Halteres ochraceous. 
Length. —7'5 to 8 mm. 
£ . Head with white and ochraceous scales and long yellow 
hairs, border of the eyes white scaled. Antennae ochraceous, 
with narrow darker rings, plume hairs black at the base on the 
inside, the remainder silky, ochraceous ; apical joints dark ; palpi 
with ochraceous ground colour, the first two joints and ends of 
remaining joints covered with dark scales, the bases white 
scaled, hairs silky ochraceous and brown ; proboscis yellow, with 
black apex and black scales on the base. 
Thorax with curved yellowish, and numerous long white 
scales, giving it a frosty and mouldy appearance; the yellow 
scales are especially noticeable as a large patch at the sides in 
front and as a median stripe, and also again at the back of the 
mesonotum; scutellum clothed with white scales; metanotum 
brownish yellow. 
Abdomen much as in the 9 j hut with more frosty-white 
scales; claspers yellowish. 
