74 Tre BLowFules or NortH AMERICA 
each segment darker; third segment with posterior margin dark 
metallic purple and with strong marginal bristles; fourth seg- 
ment with dark brown pollen in certain lights and with a 
marginal row of bristles; sternites light brown but darker toward 
fifth, each with long and strong erect black marginal bristles 
and with several scattered discal bristles. 
Male. Head height 18.0; width 22.0; length at antenna 11.0 
and at vibrissa 9.4; eye height 15.0; bueca 0.16 head height; frons 
at vertex 0.08 of head width, only a narrow line at narrowest, 
but widening to 0.26 at lunule; frontal row consisting of about 
seven bristles, the rows diverging anteriorly with the frontale, 
and obsolete at the narrowest portion of frons; parafrontale 
narrow, bare; parafaciale 1.6 in width opposite lunule, narrower 
below; vibrissae placed 5.0 apart; palpus 6.2 in length. Wing 
with costal sections 2 to 6 in the proportions 120 :120:150 :54:32. 
Otherwise like female except for normal sexual differences; 
details of genital segments (pl. 11, D and E) as illustrated. 
Length. 14 mm. 
Distribution. Coastal eastern Central America north as far 
aS Belize, British Honduras, south as far as Panama, and inland 
as far as Flores, northeastern Guatemala. 
The female description is based upon the holotype, and the 
male description upon a male specimen selected from a series 
trapped in Panama. 
A series of facialis was collected during August and Septem- 
ber, 1936, in fruitfly traps on Barro Colorado, Canal Zone, 
Panama, by James Zetek. Several of the specimens of this series 
were gravid upon capture and had large larvae of apparently 
the second instar partially protruding from their abdomens. 
These larvae varied from 7 to 9 mm. in length. 
Larva. Length 3-14 mm. Translucent pearly white in early 
hours, the segmental lines distinet but with little or no indica- 
tions of spinose bands of more mature specimens, the pigmented 
and spinose areas becoming more apparent with development and 
causing the specimen to appear banded. Cephalic segment (pl. 
32 D) large, with three or four horizontal oral grooves and with 
sclerotized pigmented areas laterodorsally toward posterior mar- 
gins, these gradually extending around the entire posterior 
margin; second segment in early hours of development with an 
area of minute single-pointed spines on anteroventral and lateral 
margins, these becoming more definite, the spines larger and 
more pigmented as specimen matures; posterior half or more 
dorsally and posterior third or more posterolaterally pigmented 
black; third segment posterolaterally toward middle with pig- 
