36 
92. Front destitute of back wardly curving macrochaBtee outside of the two frontal 
rows 93. 
Front in ea'cli sex hearing two or three pairs of backwardly curving macro- 
cha'ta- outside of the regular frontal rows (p. 116) Paeudoeha ta. 
93. Bend of fourth vein bearing a long appendage or distinct fold. (p. 101) Euphorocera. 
Bend of fourth vein destitute of an appendage or fold (p. 102) Phorocera. 
94. Sides of face at narrowest part less than one-third as wide as the median 
depression 96. 
Sides of face more than ono-half as wide as the median depression 95. 
95. Head at tin- vibrissa- much shorter than at base of antenna', bend of fourth vein 
destitute of an appendage (p. 89) Macrome'ujcnia. 
Head at the vibrissa' as long as at base of antenna-, bend of fourth vein bearing 
an appendage (p. 89) Metaphyto. 
96. Diameter of head at the \ ibrissae much shorter than at base of antenna', bend of 
fourth vein destitute of an appendage 97. 
Diameter of head at the vibrissa? as Long as at base of antenna- 98. 
97. Frontal bristles descending at least to last third of the second an tennal joint. 
(p. 91) Exorista. 
frontal bristle m>t descending below the base of the second an tennal joint. 
(p. 64) Macquartia. 
98. Base of fourth vein bearing a long appendage ; second and third segments of the 
abdomen destitute of discal inacrochsets (p. 87) Nemoraa. 
Bend of fourth vein at most with an extremely short appendage, second and 
third segments of abdomen bearing discal macrocha-ta- (p-88) Panzeria. 
Jt'.t. Antenna- reaching at least the lowest fourth of the face 110. 
Antenna- not reaching below the lowest third of the face 100. 
100. Vibrissa at less than one-half the length of the second antenna] joint above 
the level of the front edge of the oral margin 108. 
Vibrissa inserted at least the length of the second an tennal joint above the level 
of the trout edge of the oral margin 101. 
101. Lowest frontal bristles below middle of the second antenna! joint 105. 
Lowest frontals not below base of the second an tennal joint 102. 
102. Cheeks Less than one-third as broad as the eye height, arista never thickened 
on more than the basal third 103. 
Cheeks almost as broad as the eye height, arista thickened nearly to the tip, 
abdomen shining, not pollinose (p. 85) Melanophrt/8. 
LOS. Frontal bristles in two rows 101. 
frontal bristles in four rows (p. 79) Pachyophthalmus. 
104. Diameter of head at the vibrissa- as long as at base of antenna-, lower front 
angle of the third antennal joint not prolonged in the form of a tooth. 
(p. 80) Scnotainia. 
Diameter of head at the vibrissa- much shorter than at base of antenna-, lower 
front angle of the third antennal joint prolonged into a sharp tooth. 
(p. 115) Accmyia. 
105. Ocellar bristles present, directed obliquely forward 106. 
< (cellar bristles wanting (p. 81) Helvosia. 
106. Hind tibia' not distinctly ciliate outwardly 107. 
Hind tibia- outwardly ciliate with bristles, apical cell open (p. 83) Aiacta. 
107. Apical cell open (p-81) Biomyia. 
Apical cell closed and short petiolate (p. 81) Pseudotractocera. 
108. Pair of lowest frontal bristles not below base of second antennal joint 109. 
Pair of lowest frontals below middle of second antennal joint, frontal bristles 
in two rows (p. 83) Atacta. 
109. Frontal bristles in four rows (p. 79) Pachyophthalmua. 
Frontals in two rows (p. 122) Poraphyto. 
