1937] 
Exotic Syrphid Flies 
17 
triangle is therefore long, acute in front, its sides parallel 
behind. Occiput remarkably thick, pale brownish polinose, 
black punctate. Vertex similarly pollinose and punctate, 
anterior ocelli far removed, lying in brown pollen, the 
posterior pair in a black area. Eyes bare. Pile of the vertex 
largely blackish except just in front. Front and face covered 
with brilliant silver scalose pubescence and some erect white 
pile. Occiput punctate white scalose, short white pilose. 
Antennae situated slightly below middle, black. Third joint 
large, ventrally pointed. Arista basally thickened, yellow, 
remainder very wiry, slender and dark. 
Dorsum of thorax black, obscurely shining, thickly punc- 
tate, pile short, thick, black with some pale hairs, the suture 
narrowly pale whitish or greyish pollinose. Scutellum 
concolorous, flat, its edge with a conspicuous narrow yel- 
lowish brown pollinose border, its apex with outwardly 
directed short pile of the same color, and its erect surface 
pile longer than that of the thorax and entirely pale. More- 
over, the bulk of the pile is also on the rim and directed 
upward at an angle of forty-five degrees. Squamae and hal- 
teres brownish yellow. 
Abdomen decidedly flared basally ; abdomen shining black, 
thickly black punctate, bearing thick appressed black bristles 
most prominent on terminal segment, and considerable fine 
white pile, particularly on the sides of the abdomen. First 
segment with a narrow V of white punctate pollen, barely 
interrupted medially, the angle anteriorly directed, and the 
ends continued (narrowly) into the corners of the third 
segment. Third segment similarly marked, and fourth 
similar except that the pollinose spot spreads out posteriorly 
and is largely broken by black punctate spots. Fore and 
middle legs brown, apices of the femora, of the tibiae and 
their base and all the tarsi brownish yellow. Hind femora 
and tibiae black, except narrow apex of former, and base of 
latter; both thickened, the femora greatly enlarged. Hind 
tarsi brown, basi tarsi greatly dilated. 
Wings with terminal segment of fourth longitudinal vein 
oddly angulated, just before reaching the third longitudinal 
vein, it forms an acute V-shaped angle ; the angle of the V is 
spurred. Wings slightly fumose. 
Length 8.5 mm. 
