ART. 9 FLIES OF THE FAMILY SYRPHIDAE SHANNON 13 



on sides of second tergite, on sides and through the middle of third 

 tergite, and on entire surface of fourth and fifth ( ? ) tergites ; wings 

 faintly smoky; spurious vein absent; squamae white with long, 

 branched cilia; plumula present. Length 7 mm.; wing 5.5 mm. 



One female. 



Tyfpe locality.— Km2,zon (1866, H. W. Bates^). 



Type. — In British Museum. 



HALICTOMYIA, new genus 



Genotype. — Halictotnyla holiviensis., new species. 



Belongs to the tribe Chrysogasterini. Eyes pilose ; front and face 

 entirely shining black and pale pilose; occiput swollen; antennal 

 pits separated ; antennae elongate, extending a little below oral mar- 

 gin; third joint one and one-half times length of the basal two; 

 arista shorter than third joint; face with a slight median tubercle; 

 oral margin of very nearly even contour, with a slight and very broad 

 frontal emargination; legs unusually long pilose (for this group); 

 post angular section of apical cross vein directed straight upward 

 for more than one-half its length, then outward; posterior cross 

 vein very short and joining fourth vein, at nearly right angles, 

 being slightly directed inward. (Fig. 6.) 



The genus partakes of some of the characters of the Microdontinae. 



HALICTOMYIA BOLIVIENSIS, new species 



Female. — Rather small, entirely dark aeneous species, with an ap- 

 pearance similar to that of certain bees of the genus Halictus. Eye 

 densely but very short pilose, a nearly bare transverse stripe on upper 

 third; ocellar pile black, remainder of pile on front and face pale, 

 downy in appearance; face converging slightly downward; tubercle 

 inconspicuous ; lower margin of eye separated by less than the width 

 of third antennal joint; mesonotum entirely dark aeneous, pale 

 pilose; all femora dark aeneous, apices yellowish brown; fore and 

 mid tibia j^ellow brown, black pilose; first three joints of fore and 

 mid tarsi whitish, the fourth and fifth joints blackish; hind femur 

 rather swollen, pale pilose; hind tibia and basal three-fourths of 

 basitarsus black, with rather long and erect black hairs; apex of 

 basitarsus and second and third joints whitish with pale pile; last 

 two joints blackish; abdomen pale pilose, shining bluish aeneous; 

 hind margins of second and third tergites opaque black; wings hya- 

 Ime. a faint clouding in the middle; squamae, halteres and plumula 

 whitish, the latter well developed. Length, 6 mm. ; wing, 4.5 mm. 



One female. 



Type locality. — Cavinas, Beni, Bolivia (W. M. Mann, Mulford 

 Biological Expedition, 1921-1922). 



Type.~C2ii. No. 28762, U.S.N.M. 



