59. 
34 
Sides-of fice destitmte of svombimacrochietierseoeeee seer sae eee eee 60. 
Sides of face bearing one or more pairs of stout, downwardly curving macrochete 
below the lowest frontal bristles, arista thickened on the basal three-fourths. 
(p. 77) Paraplagia. 
60. Arista thickened almost to the tip, third vein bristly nearly to the small cross- 
WHS oo cncdeaesse cacesH Sup sBue Sb Sos cued cbossa Sacco acude (p. 77) Metaplagia. 
Arista never thickened to the middle, third vein bristly less than halfway to the 
BMAllicrOSSVEIN =? 5.c:. 2 - Slee e ste ses ote Sete ene tees eee (p. 76) Heteropterina. 
61. Facial ridges bristly on less than the lowest fourth. ...........---....-...-- 63. 
Hacial ridees) bristly on iat least tbhemower Wallis <2 ose leet crete rete eee 62. 
62. Penultimate joint of arista over twice a3 long as broad, bend of fourth vein 
destitute of a distinct appendage...---..-.......-.....-- (p. 187) Chatogedia. 
Penultimate joint of arista shorter than broad, bend of fourth vein with a dis- 
THD NCW AYO DeMNMEEG)s = cao cee aes coScas s5u0du GocoSS Sons pecSoo SedooE (p. 127) Araba. 
63. Antenne reaching only slightly below middle of face .............-.--....- 64. 
Antennie reaching to or below the lowest fourth of the face ............---- 72. 
642° Kirst posterior cell open... &. 5-22 a2 oe = .anine os ese sles ee eee 65. 
First posterior cell closed, the petiole as long as the small crossvein, cheeks two- 
thirds as broad as the eye height, facial ridges nearly parallel, sides of the face 
at narrowest part each as wide as the median depression .(p. 132) Luthyprosopa. 
65. Abdomen subopaque, partly or wholly covered with pollen .......-.....---. 66. 
Apdomentshimimig, destitute on polllene === soe ee =r ae ear (p. 50) Myiophasia. 
66. Vibriss:e inserted at least the length of the second antennal joint above the 
CMPD EOWN s4o¢sm sede o6e 4 gees soe boscbe pSeeee so ceGo Saccc coossetaonsa sce: 67. 
Vibrisse inserted half the length of the second antennal joint or less above the 
(ie ete ht bee eee eee Nera pese och Seco hese coo SocorU CASE Ee nonicubb cases 70. 
67. Frontal bristles not descending below base of antennie -.......-.....--.---- 68. 
Frontal bristles, at least two pairs, situated below base of antenniw, vibrissw 
near middle of face, cheeks broader than the eye height-(p. 138) Microphthalma., 
68. Cheeks less than one-half as broad as the eye height, sides of face destitute of 
macrochie te Sos. fot vices ct sacie serdioe we slo ols Seis) IN nee ene te leisuee Stata oteea lee eee] See 69. 
Cheeks almost as broad as the eye height, sides of face bearing a row of macro- 
CIP BITS) cutee aceam se dag acbas BenSoo SodesuoonscS osoELDpSooEs sbocee + (p. 51) Phyto. 
69. Small crossvein beyond the tip of the first vein ............-.. (p. 80) Senotainia. 
Small crossvein far before the tip of the first vein. ..--...---.. (p. 188) Amobia. 
70. Third joint of antenne at most but slightly longer than the second, sides of the 
face destitubecoh macrochee ties. = sas. seen ae nee ee eee er eee tee ile 
Third joint more than twice as long as the second, antenne two-thirds as long 
as the face, sides of face bearing a row of macrochete.-.(p. 131) Brachycoma. 
71. Second joint of arista over twice as long as broad......-... (p. 143) Eehinomyia. 
Second joint at most only slightly longer than broad .......-... (p. 188) Amobia. 
72. Face bearing macrochete at least near lower ends of the eyes....-.-...---- 73. 
Hace destitute of macrochiete on its sides 22-2522 2225 -- sense eee eee 76. 
73. Head at the vibrisse as long as at base of antenne, third joint of antennex less 
han) bywlceras ome asp le Sec Om eps ae ete ee eee eee eee eee 7A, 
Head at the vibrissee much shorter than at base of antenniv .-..-.....------ 105% 
74. Hind crossvein much nearer to the bend of the fourth vein than to the small 
CTOBSVOIN, <2 Loceccseecsceys- ecise es coos oe pe eee ae a Del ol) eBrelnycontar 
Hind crossvein at most only slightly nearer to the bend than to the small cross- 
Weil A ph atmerere bo condaH Sande esoaas cbobsbigsanco mbes bonded oes (p. 180) Tricogena. 
75. acial ridges almost parallel, sides of face at narrowest part each nearly as wide 
as bhe median: depressions ose---25-54 Seabee eee eee (p. 128) Opsidia. 
Facial ridges widely diverging below, sides of face each less than one-half as 
widews the median depression: © ss, gee ates eee lel orate .(p. 127) Metopia. 
