SUBFAMILY CHRYSOMYINAE 171 
Sitzber. 4-7:245, 1925; Townsend, Manual of Myiology, 
vol. 5, p. 166, 1935. 
A dark blue to bluish-black species with lustrous blue black 
abdomen, black head and appendages, and hyaline wings. 
Male. Head (pl.3, C and D) with eye height 5.7; head height 
8.4; length at antenna 6.1 and at vibrissa 6.9; bucca 0.44 of eye 
height, with long abundant black hair; front at narrowest 0.26 of 
head width, 0.40 at vertex and at lunule, mostly shining black but 
some thin gray pollen anteriorly, and with some long black thin 
hairs outside frontal bristles which are especially abundant on 
vertex and extend anteriorly to slightly above middle of para- 
faciale; faciale bristled about four-fifths the distance to the an- 
tennal base; frontal row of bristles consisting of from 10 to 12 
long thin erect bristles which extend anteriorly to middle of the 
second antennal segment, the rows only moderately diverging 
anteriorly; inner vertical bristles long, hairlike, decussate; para- 
faciale narrowed above, with very thin pollen; palpus yellow 
orange, 4.0 in length; third antennal segment 2.2 times as long 
as second, brown to black; arista black, with short black plu- 
mosity for three-fourths its length; back of head with one well- 
defined and four to six ill-defined rows of postocular cilia and 
with abundant elongate black hair. 
Thorax blue black with purple and green luster, with silvery 
pollen, and with darker dull black longitudinal stripes on pro- 
thorax which do not extend beyond scutellar suture; pleura shin- 
ing, with thin gray pollen below; propleuron with dark hair; 
predorsocentral bristles long and erect, the hindmost posterior 
bristle placed 1.0 before suture; prosternum with scattered black 
setae; preparapteron and greater ampulla with fine short de- 
eumbent white pubescence; postacrostichal bristles long and 
hairlike, only the preseutellar strong; postdorsocentral bristles 
three strong, the second weak and sometimes absent but the row 
spaced for four; prothoracic and metathoracie spiracles with ~ 
dark brown hair; scutellum with lateroapical discal bristle, un- 
der surface with ane brown hair. 
Legs black, mostly shining; middle tibia with feet: 
placed dorsal row of bristles and with a row of posterodorsal bris- 
tles; middle femur with two anterior bristles near middle, an ir- 
regular anteroventral row and a ventral row extending from 
base to near middle; middle tibia with four anterodorsal bristles, 
one near basal fourth, two near middle and one near apical 
fourth, two posterior bristles, one near basal fourth, the other 
near middle, and four posterodorsal bristles, two near basal 
fourth short and fine, and two near middle longer and stouter; 
