1944] Studies on Syrphid Flies 23 
brown with still darker vittae as follows : a pair of narrowly sepa- 
rated, median vittae slightly diverging posteriorly, the posterior 
ends pointed but rounded on the medial surface, running nearly 
half-way down that part of the mesonotum behind the suture; 
moreover, rather widely separated from the median pair, is the 
outlying pair of wider vittae, narrowly interrupted at the suture; 
their posterior section of which is wide but which becomes slender 
before it stops almost at the scutellum. Between each of the 
vittae and narrowly enclosing them even at their posterior ends 
and including the whole of the outer lateral margin of the thorax 
the area is covered with light yellowish-brown, almost golden 
pollen; thus a large, broad, posterior semicircle lying in front of 
the scutellum is left bare. Pile of dorsum of the thorax and of 
scutellum and of pleurae quite erect, wholly pale with a shining 
silky yellow luster; it is especially long just before the mesonotal 
suture on the mesopleurae and the scutellum. Abdomen: elongate, 
slenderly oval, widest at the end of the third segment, very little 
less wide basally or at the end of the fourth segment, its greatest 
width not quite equal to that of the thorax ; second and third seg- 
ments a little longer than the fourth and fifth; fourth segment as 
long as its own basal width; the fifth segment is a truncated equi- 
lateral triangle. Abdomen shallowly convex, non emarginate 
with the ground color wholly a light rusty red or orange-brown, 
largely opaque but more shining on the posterior margins and on 
the narrow basal margins of at least the posterior segments. 
There is a conspicuous though not wide, transverse, uniform 
black band across the posterior margin of the second segment 
and another one about the same width similarly placed on the 
third segment. On the fourth segment there is a quite subapical, 
transverse fascia narrow towards the middle, as it nears the mid- 
line turning sharply upward as a sharp-pointed wedge of black 
that reaches quite to the midpoint; on its outer lateral point it 
turns down sharply to reach the posterior corners of the segment. 
On the anterior part of the fourth segment some distance from 
the base there is a slightly oblique slender fascia, its inner end 
pointed and directed towards the midline of the base ; towards the 
base the inner ends are separated by three times their width. On 
the anterior half of the third segment about the same distance 
from the base, are a similar pair of slightly oblique stripes sepa- 
rated by less than twice their width. Legs: almost wholly light 
yellow, the hind tibiae and tarsi brownish-yellow due perhaps to 
