76. 
Ue 
35 
Last joint of antennie at least twice as long as the second................-. (tle 
Last joint at most only slightly longer than the second..... (p. 145) HKehinomyia. 
Second segment of abdomen bearing at most only two marginal macrochewte, 
IMAGES Ob eC Ultabe vase rs teem ae Reem eaetee cece eas ose sels coe ete 78. 
Second segment bearing at least four marginal macrochietie, hind tibize out- 
wardly densely ciliate with flattened setz.-...-.....-... (p. 123) Blepharipeza. 
Diameter of the head at the vibrissee much shorter than at base of antenne, third 
joint of the antennw at least two and one-half times as long as the peed 
(p. 128) Hilarella. 
Diameter of head at the vibrissze as long as at base of antenne, third joint of 
antenne less than twice as long as the second...--..-.-.--. (p. 181) Brachycoma. 
79. Proboseis beyond the basal articulation at most one and one-fifth times as long 
ASPTSL ON LRO tell OA ivan verre take rae yes Heath Seta siaiey Sh oa SE ce epee dos, Loe bea cto 84. 
Proboscis beyond the basal articulation at least one and one-third times as long 
BesherountpotmnMead JO Vesw al ser Acteet. Sascha eas tes en eee eee eee ae 80. 
80. Apical cell ending at or close to the extreme tip of wing.--..----.-----.-.-.- 82. 
Apical cell ovine far before the extreme tip of wing, proboscis geniculate near 
Mes AS CKONM ype eet see Greil eo se = aioe ratele oes erase e reicvels ees ane SS Seach Gisraieis Seles 81. 
81. Ridges of face bristly on at least the lower three-fourths, apical cell closed, the 
petiole longer than the small crossvein ........--.-------- (p. 79) Chetoglossa. 
Ridges of face 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) Gymnocheta. 
Abdomen black or more or less y elects 
Apical cell ending far before the extreme tip of wing.........-...-..---.. 85. 
Apical cell ending at or close to the extreme tip of wing ..-..----.....-- 129, 
. 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, 
occllar brstlesidinected: obliquely forward! 5315.2. 2-)5-20+---- 52sec ose. 86. 
86. Bristles of facia] ridges confined to their lowest third... ---. (p. 76) Heteropterina. 
Bristles ascending at least to upper third of the ridges..(p. 77) Plagiprospherysa. 
87. Ocellar bristles when present 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 
onbmorethantherlower Walitesst tone sae =e Oe ts Sete epee (p. 79) Distichona. 
Penultimate joint shorter than broad, facial ridges never bristly on more than 
Le WON sGeS Gitttrh yess Ney Se Pe a oped eave yee Sar lane ataratein o Sisio Scr) < (p. 68) Leucostoma. 
89. Eyes bare, or with indistinct, short, sparse hairs...--.....--.....---------. 99, 
Ee SCULS Hi Ch hymen VIN a eee ere ee ee A ob chat eats ale ee ee See 90. 
90. Second segment of abdomen bearing at most only three pairs of macrochietie in 
PHS dl erorechiogd OLsUMpeer sees eo cee ces sen cs since lee tes ee oie elec om 
Second segment thickly covered with macrochetie on at least two-thirds of its 
ETCH DIN «ete bee te or ae aah eer rie SOP g tes ger een, By hee ae (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. 
