30 
STUDIES IX AMERICAN EPHYDRIDAE (dIPTERA) 
3. Alxlomen immaculate; middle tibiae of male ciliate 4 
Abdomen with two series of spots 5 
Abdomen with four series of spots, or banded 8 
4. Tarsal fascicle black; facial bristles close, confined to lower third (Nearc- 
tic species) loewi p. 44. 
Tarsal fascicle yellow; facial bristles well separated, confined to lower 
half of face (Nearctic species) cognata p. 46. 
5. Abdominal spots triangular, not attaining apices of segments 6 
Abdominal spots' elongate, attaining apices of segments but not produced 
laterally; second costal section four times as long as third (Nearctic 
species) biseriata p. 46. 
Abdominal spots triangular, attaining apices and lateral margins; second 
costal section three times as long as third (Cuban species) . 
fulvimana p. 47. 
6. Second antennal joint yellow; arista mth 9 to 11 hairs; frons much broader 
than long; middle tibiae not ciliate erythrocera p. 36. 
Second joint black; arista with 6 to 7 hairs; frons not broader than 
long; middle tibiae of male ciliate 7 
7. Face broad, silvery white; cheeks twice as broad as third antennal joint 
(South Florida species) floridensis p. 46. 
Face narrow, yellow or gray; cheeks not much broader than third antennal 
joint (Nearctic species) loewi p. 44. 
8. Mesonotum without any trace of stripes on dorsum; abdominal spots 
blackish and more or less shining (Nearctic species) riparia p. 32. 
Mesonotum with indications or suggestions of stripes; abdominal spots 
obscure or faintly shining 9 
Mesonotum with brown irrorations at bases of setulae; abdominal spots 
brown, obscure or slightly shining (Neotropical species). 
punctifera p. 34. 
9. Second antennal joint and fore legs black (Nearctic species) . .bicolor p. 35. 
Second antennal joint and fore tibiae yellow erythrocera p. 36. 
10. Face with a median brown stripe; middle tibiae of male not ciliate. (Neo- 
tropical species) facialis p. 38. 
Face immaculate; tibiae normal. 
Lateral mesonotal stripe broad; abdominal spots isolated or narrowly 
connected basally; abdomen of male arched, depressed on dorsum, 
with fifth segment much developed (Nearctic species) . . vittata p. 42. 
Lateral stripe narrow; abdominal spots broad and more or less con- 
nected basaUy ; abdomen normal (Neotropical species) . . virgata p. 40. 
B. Middle tibiae vdth four extensors; facial bristles fine, series extending to 
foveal region {Agrolimna) . 
1. Antennae and palpi black 2 
Palpi yellow 7 
2. Tarsal fascicle black; mostly ohvaceous species with rather distinct frontal 
stripes; abdominal bands attenuating laterally; arista with 8 to 10 
hairs 3 
Tarsal fascicle pale 4 
