116 
Psyche 
[December 
A MEGAMORPHIC AND TWO CURIOUS MIMETIC FLIES 
By Frank M. Hull 
University of Mississippi 
At a recent visit to the Carnegie Museum the writer was 
afforded the privilege of studying the unidentified Syrphid 
flies in the collections. Among this material were discovered 
certain curious types upon which it is desired to report at 
this time. The bulk of the material will be reported upon 
later. I wish to express my thanks to Dr. Hugo Kahl for the 
opportunity to study this material. 
Chysidimyia, new genus 
Eyes bare. Antennae slender, third joint densely erect 
pubescent, the dorsal arista thickest in the middle. Whole 
face extended as a rounded lump anteriorly, a crease sepa- 
rating the lower face from the upper, and lying shortly above 
the oral margin. Antennae inserted from ventral surface of 
an overhanging frontal shelf. Scutellum with two spines, 
moderately separated. Abdomen oval-elongate ; the sides of 
the second segment greatly thickened and overlapping the 
corners of the succeeding segment making possible a down- 
ward deflection of the remainder of the abdomen. Whole 
lateral margins of the abdomen enormously thickened and 
inrolled ; segments three, four and five entirely fused. Legs 
simple, an oblique groove on the basal part of hind femora. 
Whole head, thorax, abdomen and legs everywhere bril- 
liant metallic green and extraordinarily deeply punctate. 
The punctures are actual depressions, which on the posterior 
rim of the second abdominal segment, become grooves. 
Wings with the posterior angles of the first posterior and 
discal cells rounded, that of the first posterior gives off a 
spur to wing margin. There is a spur cutting down towards 
the spurious vein from the third longitudinal vein. 
Genotype: Chysidimyia chrysidimima new species. 
