1956] 
Hull — New southwestern Mallota 
25 
white. In profile the face is distinctly concave above the 
low tubercle; the cheeks are shining black. The first two 
segments of the antennae are black; the third segment 
distinctly wider than long and evenly rounded apically, 
a uniformly dark reddish brown color ; the arista thickened, 
bare and entirely light brownish-yellow. Occiput black, 
densely covered with silvery pollen along the middle and 
below; this pollen begins near the upper third of the 
eye; the pile of the occiput is yellowish throughout, in- 
cluding long, dense, yellow pile immediately behind the 
vertex. 
Thorax : the mesonotum is black, but is densely covered 
with light ochreous yellow pollen and thick, long, dense 
opaque, yellow pile, including the humeri and through- 
out the entire dorsum. The scutellum is subtranslueent 
ochreous yellow and covered with the same sulfur yellow 
pile; pleura black with thick, opaque yellow pile on upper 
portion of the mesopleura, which becomes sparse and 
scattered and less conspicuous on the ventral portion of 
the mesopleura and on the anterior and upper portion 
of the sternopleura. The pile on the posterior corner of 
the sternopleura and all of the pile of the pteropleura is 
black. Squamae subtranslueent brownish white; fringe 
brownish yellow; halteres yellow with dark brown knob. 
Legs : all of the femora black or nearly so; in some 
lights the hind femora, towards the base, appear to be 
dark reddish sepia; the anterior and middle tibiae are 
nearly black, becoming more faintly dark brown near the 
base and apex; hind tibiae similarly colored, markedly 
flattened apically and distinctly arcuate. The pile of the 
femora and of the tibiae black, except along the anterior 
surface of the anterior tibiae, where the pile is yellow and 
there are a few yellow hairs along its posterior surface. 
All of the tarsi brown with black pile dorsally. 
Wings : hyaline, with a strong, rather distinctly de- 
limited, large, subquadrate, sepia brown cloud situated in 
the middle of the wing; this spot encloses and covers the 
anterior margin, the whole basal half of the first posterior 
cell; the apical half of the first basal cell; the upper basal 
corner of the third posterior cell; the apex of the second 
