212 THE BLOWFLIES OF NortH AMERICA 
to 0.20 the length of the preceding section; lower squamal lobe 
bare. 
FRANCILIA SHANNON 
Francilia Shannon, Insecutor Inscitiae Menstruus 12:73, 1924; 
Wash. Ent. Soe. Proc. 28(6) :129, 1926; Townsend, Rev. de 
Ent. 1:72, 1931; Manual of Myiology, vol. 2, p. 171, 1935; 
ibid., vol. 5, p. 149, 1937. Genotype. Francilia alaskensis 
Shannon. (Monobasic.) 
Male and female. Head (pl. 4, D) longer at vibrissa than 
at antenna, the metacephalon, which is somewhat longer than in 
Phaenicia, sufficiently produced posteriorly to cause the head 
to appear more or-less square in profile; parafaciale bare, wide 
above and below; ocellar triangle longer than in either Lucilia 
or Phaenicia; vibrissa at oral margin; elypeus twice as long as 
wide, shallow, coneave in profile; facial carina distinct between 
basal antennal segments, very narrow opposite first segment 
and widening opposite second, then widening and flattening 
toward middle of third segment where it practically disappears; 
palpus long-clavate; faciale almost straight and nearly vertical 
in profile, slightly convex toward vibrissa, and with several rows 
of short setae above vibrissa which ascend about one-third the 
distance to the antennal base; proboscis two-thirds head height; 
haustellum two-thirds as long as proboscis; antennal bases 
slightly separated by the narrow carina; first and second seg- 
ments short, third segment considerably wider than normal in 
Luciliini; arista with penultimate segment one and one-half to 
two and one-half times as long as diameter, the terminal seg- 
ment thickened for about one-half its length, then gradually 
tapering to apex, with short cilia above and below for about 
two-thirds its length; back of head rounded. 
Thorax with four humeral bristles triangularly atranged, 
three laterally in a row and one medianly; propleuron thinly 
setose in middle toward the anterior margin; propleural bristles 
three, one strong and two weak; preintraalar bristles two, the 
hindmost absent; preacrostichal bristles two; prosternum flat, 
setose, narrow posteriorly but strongly widening and bulging 
anteriorly; postalar declivity setose. in center; tympanic pit 
bare in center but with upper expansion and ridge setose; post- 
acrostichal bristles three; postsupraalar bristles three; meso- 
spiracular bristle strong; spiracles smaller than in other species 
of Luciliini; scutellum with under surface laterally with setae. 
Legs as described for the genus Phaencia. 
Wing with doubled costal spine; fourth vein with nearly 
