j 944] Studies on Syrphid Flies 25 
by almost the length of one spot. Remainder of the segment 
shining black. Fourth segment quite similar to the third, the 
spots barely less wide. The fifth is segment wholly shining black 
its anterior corners somewhat brownish. Pile of the abdomen 
long and pale upon the sides of the first and second segment, 
shorter but pale and erect along sides of the third and fourth seg- 
ments; the pile of the third and fourth segments is broadly 
through their middles sparse, flat appressed and chiefly black. 
Pile of fifth segment long and largely black. Legs: all of the 
femora black, their extreme apices brownish. Anterior tibiae, 
middle tibiae, and hind tibiae except its extreme base, dark brown; 
all of the taris blackish. Pile of femora chiefly pale. Wings: pale 
brownish, the stigmal cell wholly dark brown; subapical cross 
vein sinuous. 
Holotype: No. 23800, one female, Nikko, Japan, April 22, 1934, 
L. Grissett, collector. 
This fly traces to orientalis H. B. in Shiraki’s key. 
Syrphus convexigaster n. sp. 
Related to orientalis H. B. from which it differs in abdominal 
pattern. 
Female. Length 9.15 mm.; wing 8.8 mm. Head: upper part of 
occiput and vertex and front shining black, polished, black 
pilose. A broad, transverse, broadly interrupted fascia of golden- 
brown pollen lies across the quite concave lower portion of the 
front ; its anterior margin is concave ; the pollinose area is drawn 
out along the eye margins until it is opposite the antennae. Face 
extensively light brownish-yellow and yellowish pubescent on 
either side from eye margin to the base of the conspicuous shining 
black tubercle. The yellow of each side is connected beneath the 
antennae and at the eye margins about the middle of the face this 
yellow area leaves the eye margins and drops nearly vertically 
down the face, almost to the ventral angle of the oral margin; 
thus a wide, black middle stripe is left upon the face which tapers 
acutely to a point beneath the antennae and which diverges on 
either side along the oral margin and connects with the black of 
the cheeks. Facial pile erect, sparse and black throughout; the 
oral margin, the extreme posterior part of the face and the cheeks 
also light pubescent. Thorax: black in color, the details obscured 
by grease; its pile is erect and long, though sparse and wholly 
pale. Pile of pleurae long and shining yellowish. Scutellum yel- 
