1941] 
Flies of Family Syrphidse 
47 
part of the mesonotum outside of the stripe golden brown. 
Between the golden brown and the lateral yellow margins is 
another metallic grey stripe. Humeri posterior two-thirds 
of the mesopleurse and a spot on the upper part of the sterno- 
pleurse pale yellow. Suctellum pale yellow, the disc broadly 
metallic brown. Abdomen: black marked with yellow, first 
segment about half black, the anterior part yellow including 
the lateral margin which is narrowly continuous with the lat- 
eral margin of the second segment. Second segment shining 
black, with an extensive transverse yellow band from margin 
to margin which is in width barely over one-fifth the length 
of the segment. Third segment broadly black upon the poste- 
rior part; about one third of the way from the end of the 
segment it sends forward a broad vittse that rapidly expands 
into a large black spot, the anterior pointed end of which 
reaches the base of the segment. From the base of this 
median vittse at its posterior point of origin, the black ex- 
tends obliquely forward to the lateral margin of the segment 
and thence forward to occupy almost all of the lateral margin 
of the segment. At its lateral marginal apex it is confluent 
with a small oval black spot situated anteromedially, which 
small spot is narrowly separated from the large median sub- 
basal spot. Fourth segment with similar pattern but the 
apex of the segment and lateral margins of the segment are 
extensively reddish brown and the somewhat smaller sub- 
lateral, subbasal black spots are more slender, more pointed 
and isolated. There is a fine narrow median reddish brown 
line bisecting the middle black vitta. Fifth segment with a 
pair of obtusely triangular submedial brown spots and lying 
just outside of these, touching the base are a pair of elongate 
brown vittate spots hollowed out on the inside, on the poste- 
rior two-thirds of their length. Legs : pale yellow, a brownish 
band subapically on the hind femur almost the whole of the 
basal half of the hind tibiae and all of the hind tarsi, fore and 
middle tarsi brownish. Hind femora with considerable, 
rather long, black, bristly pile ventrally. Wings: hyaline, 
stigma dark brown. 
Three males. Cotypes; Muzo, Department Boyaca, Co- 
lumbia, altitude 900 meters, 1936. J. Bequsert col. A speci- 
men deposited in the Museum of Comparative Zoology. 
