35 
76. Last j.oi tit of antenna' at least twice as long as the second 77. 
Last joint at most only slightly longer than the second (p. 143) Echinomyia. 
77. Second segment of ahdomen bearing at most only two marginal macrochata, 
hind tibiae not ciliate 78. 
Second segment bearing at least four marginal inacrochata', hind tibia* out- 
wardly densely ciliate with flattened seta 1 (p. 1 23) Blepharipeza. 
78. Diameter of the head at the vibrissa? much shorter than at base of antennae, third 
joint of the antenna- at least two and one-half times as long as the second. 
(p. 128) HilareUa. 
Diameter of head at the vibrissa as long as at base of antenna 1 , third joint of 
antenna less than twice as long as the second (p. 131) Brachycoma. 
79. Proboscis beyond the basal articulation at most one and one-fifth times as long 
as height of head 84. 
Proboscis beyond the basal articulation at least one and one-third times as long- 
as height of head, eyes bare 80. 
80. Apical cell ending at or close to the extreme tip of wing. 82. 
Apical cell ending far before the extreme tip of wing, proboscis geniculate near 
the base only 81. 
81. Ridges of face bristly on at least the lower three- fourths, apical cell (dosed, the 
petiole longer than the small crossvein (p. 79) Clurtoglossa. 
Ridges efface never bristly on more than the lowest fifth, apical cell open. 
(p. 85) Aphria. 
82. With only one geniculation in the proboscis, situated near its base 83. 
With two geniculations, one near the base and the other near the middle, facial 
ridges never bristly on more than the lowest fourth (p. 75) Siphona. 
83. Facial ridges bristly on at least the lower half (p. 73) Isoglossa. 
Facial ridges never bristly on more than the lowest fifth (p. 74) Epigrimyia. 
84. Abdomen bright green or bluish green, facial ridges never bristly on more than 
the lowest fourth, eyes hairy (p. 89) Gymnochceta. 
Abdomen black or more or less yellowish. 
Apical cell ending far before the extreme tip of wing 85. 
Apical cell ending at or close to the extreme tip of wing 129. 
85. Last section of fifth vein less than one-half as long as the preceding section. . 87. 
Last section of fifth vein almost as long as the preceding section, bend of fourth 
vein with a long appendage, eyes bare or with indistinct, short, sparse hairs, 
ocellar bristles directed obliquely forward 86. 
86. Bristles of facial ridges confined to their lowest third (p. 76) Meter opterina. 
Bristles ascending at least to upper third of the ridges, .(p. 77) Hagiprospherysa. 
87. Ocellar bristles when preseut directed obliquely forward 89. 
Ocellar bristles curving backward, apical cell closed and petiolate 88. 
88. Penultimate joint of arista over four times as long as broad, facial ridges bristly 
on more than the lower half (p. 79) Distichona. 
Penultimate joint shorter than broad, facial ridges never bristly on more than 
the lowest fifth (p. 68) Leitcostoma. 
89. Eyes bare, or with indistinct, short, sparse hairs 99. 
Eyes distinctly hairy *!". 90. 
90. Second segment of abdomen bearing at most only three pairs of macroclueta in 
the middle of the dorsum 91. 
Second segment thickly covered with inacrochata on at least two-thirds of its 
length (p. 145) Bombyliomyia. 
91. Facial ridges never bristly on more than the lower half 94. 
Facial ridges bristly on at least their lower two-thirds 92. 
