36 
92. Front destitute of backwardly curving macrochietie outside of the two frontal 
LOWS oo coe bees poet nce ew cln ds oe te Sens ween ee See eee oie ore eke ere 93. 
Front in each sex bearing two or three pairs of backwardly curving macro- 
chet outside of the regular frontal rows ....-.--..-----(p. 116) Pseudochwta. 
93. Bendof fourth vein bearing a long appendage or distinct fold. (p. 101) Huphorocera. 
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 
GOpPLressiON,...2 = 2 [coe heske fan sa cere See wee Sete s oe oe eee Soke eee ee 96. 
Sides of face more than one-half as wide as the median depression..-..----- 95. 
95. Head at the vibrissie much shorter than at base of antennie, bend of fourth vein 
destituve of anvappenda@ese-s eee = pe ee aes ae ee eae (p. 89) Macromeigenia. 
Head at the vibrissie as longas at base of antenniw, bend of fourth vein bearing 
AN apPOUNdale sa soe0 2 os ciese es einem ee ee eee eee (p. 89) Metaphyto. 
96. Diameter of head at the vibriss:e much shorter than at base of antennie, bend of 
fourth vein destitute ofan appendages..-s40-2-- ees esas eee eae 97. 
Diameter of head at the vibrisse as long as at base of antennew-.....-...---- 98. 
97. Frontal bristles descending at least to last third of the second antennal joint. 
(p. 91) Lxorista. 
Frontal bristle not descending below the base of the second antennal joint. 
(p. 64) Macquartia. 
98. Base of fourth vein bearing a long appendage; second and third segments of the 
abdomen destitute of discal macrochiete.-.....-...---...----- (p. 87) Nemoraa. 
Bend of fourth vein at most with an extremely short appendage, second and 
third segments of abdomen bearing discal macrochetie.. ---- (p. 88) Panzeria. 
99. Antenne reaching at least the lowest fourth of the face.........--.--...-..- 110. 
Antenne not reaching below the lowest third of the face..-....--....----- 100. 
100. Vibrisse at less than one-half the length of the second antennal joint above 
the level of the front ede of the loralmarainiss: os se aeee sae 108. 
Vibrissie inserted at least the length of the second antennal joint above the level 
othe trontied ge ok the tora) Mar oOineses eeee ee eee ae eee 101. 
101. Lowest frontal bristles below middle of the second antennal joint....---- 105. 
Lowest frontals not below base of the second antennal joint..........---- 102. 
102. Cheeks less than one-third as broad as the eye height, arista never thickened 
on more than the basal third. sss. seo =) ee ee - ee eee ee ee eee 103. 
Cheeks almost as broad as the eye height, arista thickened nearly to the tip, 
abdomen shinin >; mob pollinose)sase= asses see ae (p. 85) Melanophrys. 
103) cHrontalibristies an iiwOmOwSlorsace wes sects seine te nape a rstyere See at ee ere 104. 
Frontal bristles in four rows....----.-----------------(p. 19) Pachyophthalmus. 
104, Diameter of head at the vibrissie as long as at base of antennie, lower front 
angle of the third antennal joint not prolonged in the form of a tooth. 
(p. 80) Senotainia. 
Diameter of head at the vibrissee much shorter than at base of antenne, lower 
front angle of the third antennal joint prolonged into a sharp tooth. 
(p. 115) Acemyia. 
105. Ocellar bristles present, directed obliquely forward ...........-.--------- 106. 
Ocellar bristles wantiney 22-2... see -e eee ee (p. 84) Belvosia. 
106. Hind tibie not distinctly ciliate outwardly-_...:.2-...-.-..---.-.---.---- 107. 
Hind tibie outwardly ciliate with bristles, apical cell open.--. -- (p. 83) Atacta. 
10%; Apical.cell’open® 22.8 2222 te ee ea te oe eae ce ae ee (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 
1D tH WO SLO WSssco5 noe Soe oh ee en eee eee ee (p. 88) Atacta. 
109°) Brontalibristlesan fourTows-4---2- 52s eee see: (p. 19) Pachyophthalmus. 
Frontals im twW0 OWSsss0-2s-oc.ce > -siao oe eee eerie eee (p. 122) Paraphyto. 
