SUBFAMILY POLLENIINAE 
The species belonging to the subfamily Polleniinae (Color 
Plate V*) are mostly dull black with thin silvery pollen and 
small eyes. Pollenia rudis, a common parasite of earthworms 
in the United States and southern Canada, has tawny-yellow 
erinkly hair over much of the body. The species belonging to 
the tribe Melanodexiini occur only on the Pacific Coast and their 
biologies and habits are unknown. None of the species belonging 
to this tribe are known to occur in the American tropics. 
Male and female. Head width and height approximately 
equal; buecea high, often one-half the eye height or more; eye 
small, oblique; epistoma usually long and narrow; frontale 
striate, widening toward lunule; frontal width rarely exceeding 
0.10 of head width in male, often as much as 0.40 of head width 
in female, with considerable hair outside of frontal row of 
bristles and on vertex; frontal row of bristles obsolete toward 
_ vertex in male, the rows widely diverging in both sexes and 
converging again in the foremost one or two bristles; inner ver- 
tical bristles strong; outer vertical bristles absent in male; post- 
vertical and postocellar bristles weak, proclinate; ocellar bristles 
strong; frontoorbital bristles absent in male; clypeus broad and 
shallow, depressed laterally; parafaciale with scattered coarse 
setae; faciale rounded, concave in profile, with a few weak setae 
above vibrissa which is strong and usually above the oral margin; 
palpus long; facial carina present; antennal bases distinctly 
separated by a carina; third segment of antenna short, from 
one and one-fourth to two and one-half times as long as second; 
arista with penultimate segment short, apical segment thickened 
at base, plumose nearly to apex; back of head flattened or dished 
above, rounded below. 
Thorax with three humeral bristles in a straight line; pro- 
pleuron and prosternum bare; predorsocentral bristles two; 
notopleural bristles two; sternopleural bristles two; hypopleuron 
without fine hair; pteropleural bristles in a tuft; prosternum 
large, wide, bulging anteriorly; postalar declivity setose posteri- 
orly; tympanic pit bare; postalar bristles two or three, rather 
approximated; postdorsocentral bristles three; postsupraalar 
*The black impression used in Plate V is that of an etched zine plate 
photoengraved from a drawing by E. Hart (U. S. Dept. Agr. Farmers’ 
Bull. 1569). The two tint impressions (yellow and sepia) are from etched - 
zine plates photoengraved from pen drawings on sheets of celluloid which 
were superimposed over the original black and white Hart illustration. 
340 
