1941] 
New Species of Syrphidse 
161 
One male, Bolivia, Province Sara (Steinbach). Type in 
the Museum of Comparative Zoology. 
Eumerus ergator n. sp. (Plate 10, Fig. 3) 
Allied to Eumerus deceptor Cur. from which it is separ- 
ated by the yellow colored pile of the front instead of white 
and the snow white, white-pilose terminal hind tarsi, besides 
minor differences. Like deceptor the scutellum is obtusely 
dentate. 
Male. Length 11 mm. 
Head: front and vertex quite rounded. Eyes almost touch- 
ing at a point just below ocelli, escaping it by a distance 
equal to that between the upper ocelli. Face gently receding 
below antennae, faintly concave. Cheeks narrow. Color 
everywhere shining brassy brown and everywhere, including 
eyes, very densely long yellow pilose but not golden. An- 
tennae light yellow. First joint very short, second twice as 
long, third large and evenly rounded, as long as broad. 
Arista yellow at base, thickened, blackish apically. Sides of 
the face parallel, slightly wider about oral margin. The as- 
pect of the head strongly suggests a species of Pipiza. 
Thorax: pleurae, scutellum and abdomen everywhere brilliant 
brassy and clothed with long, nearly erect, brassy pile. Ab- 
domen: sides of abdomen and apex slightly copper. Sides 
of segment, with small, postero-lateral, inwardly pointed, 
yellow pollinose spots lying in a conspicuous trench or con- 
cavity. Third segment with larger similarly colored spots, 
directed obliquely forward to median line but widely separ- 
ated and with straight median edges. Fourth segment with- 
out such pollinose spots but with a coppery impression still 
more obliquely directed, lying on each side. Legs: femora 
and basal two-thirds of hind tibiae dark, golden brown with 
brassy pile ; base of hind tibiae, remainder of tibiae and tarsi, 
except for the apical three tarsal joints of mid and hind 
tarsi, varying shades of light yellowish brown. The apical 
three joints of mid and hind tarsi are snow white with snow 
white pile. Hind apical tarsi without any dilatation sugges- 
tive of E. peltatus Meijere. Wings: uniformly pale brown- 
ish. Sub-apical cross vein remarkably angulated, both an- 
