1937 ] 
Exotic Syrphid Flies 
27 
latter thick, particularly so at base, on its upper surface 
curved, with a short massive arista. Abdomen broad, oval, 
about one and one-half times as long as broad. The margins 
of the segments rolled, but in no way massively developed. 
Terminal portion of abdomen fused, gradually rounded, 
curved downward, the sides particularly convex towards the 
tip. Scutellum without points. Hind femora moderately 
thickened, femora and tibiae without cicatrices or furrows. 
Subapical crossvein erect, almost straight, meeting the third 
vein at right angles quite far back from the margin. First 
basal cell with an adventitious vein descending into first 
posterior cell. 
Genotype : Microdon chalybeus Ferguson. 
Papiliomyia n. gen. 
Head hemiglobular in profile, post occiput above tumid 
and vertex protruding as a conspicuous bump, but otherwise 
the front and vertex are quite narrow. Ocelli situated at top 
of the protuberance. Antennae situated near top of head, 
the first joint quite elongate, in fact being considerably 
longer than remaining two together. Arista weak and deli- 
cate. Face narrower from the front, converging from below 
the antennae. Eyes bare. Cheeks practically absent. The 
enormous eyes seem to cover almost the whole head. Abdo- 
men elongate, over two times as long as wide. Widest at 
junction of second and third segments, but very little wider 
here. Fourth segment most deeply transversely concaved as 
far as the anterior two-thirds, leaving a convex rim posteri- 
orly. The concave portion most oddly covered with centrally 
converging, flat lying hair from the base and sides. 
Metanotum exceedingly conspicuous and deep. Scutellum 
without points. Hind femora slender, basally spindled. 
Hind tibise thickened apically and with a deep shallow groove 
separating the apical fifth. Hind tibise very brushy as in 
Trigonoid bees. Wings long and slender. No trace of ad- 
ventitious veins descends into the first posterior cell. 
Subapical cross vein straight and recurrent as well. Postical 
cross vein sigmoid in the genotype species. Gosta deeply 
beaded with setigerous tubercles. Wings banded in both the 
known species. Weakly chitinized, delicate species, that 
suggest moths or scorpion flies. 
