70 THE BLOWFLIES OF NortTH AMERICA 
Ochromyia bicolor (Fabricius) Surcouf, Paris Mus. d’Hist. Nat. 
Nouvelle Arch. (5)6:70, 1919 (in part). 
Mesembrinella bicolor (Fabricius) Aldrich, U. S. Natl. Mus. 
Proce. 62:13, 1922; Engel, Konowia 10(2) :185, 1931; Town- 
send, Rev. de Ent. 1:69, 1931. 
A yellowish brown species with faintly infuscated wings, 
crange head, antennae, palpi and legs, the abdomen metallic 
bluish to purple except at base. 
Male. Head width 16.0; length at antenna 7.7, and at vibrissa 
7.4; eye height 11.8; head height 13.8; bueca 13.5 of eye height, 
orange, with scattered black hair, no pale hairs before the 
metacephalic suture, and thinly silvery yellow pollinose; frontale 
fully 0.60 frontal width, orange; frons narrow, at narrowest 
0.02-0.03 of head width, 12.6 at vertex and 0.20 at antennal base, 
orange, yellowish-silvery pollinose, bare; frontal row of bristles 
composed of 9 or 10 bristles, only the anterior ones strong, the 
rows diverging as they follow the margin of the frontale; inner 
vertical bristles strong, decussate; ocellar bristles long and 
strong, with a pair of accessory ocellar bristles immediately 
behind the posterior ocelli, these about two-thirds as long as the 
normal pair; vertex orange, pollinose; clypeus orange, yellowish- 
white pollinose; parafaciale 1.2 in width opposite lunule, orange, 
bare; faciale rounded, somewhat concave in profile, bristled only 
slightly above vibrissae; vibrissae 0.8 above oral margin and 
separated by 3.8, with a strong bristle just below at the lower 
anterior margin; proboscis orange; palpus orange, 4.1 in length; 
antenna bright orange, third segment 2.4 times as long as second; 
arista orange at base, brown apically, the ciliation brown; postor- 
bits brown, silvery pollinose; back of head dark brown above, 
orange below, yellowish silvery pollinose, postvertex orange red, 
one row of postocular cilia and with scattered yellowish hair. 
Thorax yellow orange to orange brown, dorsum rather reddish 
brown with whitish pollen in certain lights and with indistinct 
shining longitudinal stripes; humerus yellow to yellow orange, 
with scattered tawny and black hair, and with three humeral 
bristles; preintraalar bristles three, the foremost one weak; 
presutural supraalar bristle one; preacrostichal bristles two, . 
strong; predorsocentral bristles two, strong; propleural bristles 
one or two; mesospiracular bristle rather distant from suture; 
sternopleuron with scattered black hair above, pale hair below; 
sternopleural bristles three; hypopleural bristles arranged in a 
wide ‘‘V’’, sclerites at wing base orange; postacrostichal bristles 
two; both mesothoracie and metathoracie spiracles with orange 
