1937] 
Exotic Syrphid Flies 
19 
and trace of an inward stump on one wing. Lower terminal 
section of vein closing first posterior cell and one closing 
discal cell remarkably rounded. An extensive spur is present 
from the third longitudinal vein almost reaching spurious 
vein. 
Length 10.5 mm. 
One male, Cordova, Argentina (Davis). Type in the 
Museum of Comparative Zoology. 
Microdon digitator n. sp. 
Plate II, fig. 6. 
Male. Head rounded in profile; similar to Microdon in- 
vestigator. Front narrowest above antennas, but the sides 
nearly parallel, diverging toward the vertex. Antennae, face, 
front and vertex black, the latter shining. Antennae short, 
the first joint and third subequal, either twice the length of 
second. Arista short, much thickened basally, reaching just 
past third joint. Pile of head everywhere pale yellowish to 
whitish, sparse. 
Thorax and scutellum everywhere shining black. Pile 
sub-appressed, sparse, yellowish to golden. Scutellum evenly 
rounded, a little more pointed centrally, without spines, 
margins, dentations, etc. Halteres brown. 
First and fourth abdominal segments brown to black, 
obscurely shining; second and third pale brownish yellow, 
the second the palest, subtranslucent. Pile very short except 
on the outer edges of the second segment where it is long 
and golden. Pile black or brown elsewhere, except on the 
posterior lateral angles of the third segment where it is 
golden. Legs light brown except for the middle of all the 
femora, and quite small spots in the middle of each tibise. 
Hind basitarsi not at all thickened. 
Wings rather uniformly suffused with brown, lighter in 
the first posterior, discal, first basal cells. Termination of 
fourth longitudinal vein straight, nearly rectangular, angle 
of discal cell rounded. Spur of third longitudinal present, 
spurious vein not prominent. Angle of first posterior cell 
spurred to near by wing margin. 
Length 9 mm. 
One male, Tjibodas, Mt. Gede, Java. 1909, 4500 ft. (Bry- 
