43. 
44. 
46. 
48. 
49, 
50. 
53. 
33 
. Macroche tx of second segment of abdomen covering more than its apical half. 44, 
Macrochietie of second segment, when present, confined to the apical fifth of this 
SEGUTGINS 6 ab36.5 340 canes Be Choe SOSA He Bee Se ee ee 43. 
Cheeks over one-third as broad as the eye-height........-...- (p. 50) Myiophasia. 
Cheeks less than one-sixth as broad as the eye-height....-..- (p. 124) Winthemia. 
Third joint of the antennw almost straight on the front edge, the apex subtrun- 
CONUCUL Bad casted 6Q56dd SAS ean Reeer Eas foe nee Caen: eee (p. 145) Bombyliomyia. 
Third joint strongly convex on the front edge, the apex rounded-.(p. 147) Jurinella. 
. Posterior end of hind crossvein nearer to the margin of the wing than to the 
Small Cross vem eer emer senseless em ee oe ee os eo b~ ere aieiane octet iste 46. 
Posterior end of hind crossvein at least twice as far from the margin of the wing 
as from the small crossvein, third joint of antennsw less than three times as 
NOnOvasEGICISCCOM(e epee se ae os cia cee cS ee onc eee eee (p. 78) Cyrtophleba, 
Facial ridges never bristly on more than the lowest fifth ..............-...- 47. 
Facial ridges bristly on at least the lower half, third joint of antenne about 
three times as long as the second, apical cell open......---- (p. 186) Gediopsis. 
. Last joint of antenna at least five times as long as the second -........-..-- 48, 
Last joint scarcely longer than the second, penultimate joint of arista broader 
CWamlOM Ore eraser ets ats eS ett ae ats och ese ei see o See ese (p. 125) Muscopterysx. 
Penultimate joint of arista at least three times as long as broad, third joint of 
antenn:e of male divided lengthwise into two parts, two pairs of orbital bris- 
CAs pMEDOLNESEXES)-- saree as ecn sce Sees te coe oesics Sees eccees (p. 1387) Dichocera. 
Penultimate joint at most slightly longer than broad, third joint of antennze 
entire, male destitute of orbital bristles......-.....----.- (p. 126) Paradidyma. 
Ocell aro nish espplesentios sro seers etse soc sv-eis Set setae Soc ee ee oe Sew eeoee 55. 
Woe llanmebEIS tl CSGweaMbiM i. ef ce soto slot ioe Se es saan etc avs derch sterteee eee 50. 
Wilbrisseminserted: nearilower edeoe of faceea.- -<:5.-.--- <<< 5 2-52-56 sees ceenss 51. 
Vibrissie inserted near the middle of the face, cheeks broader than the eye height. 
(p. 188) Microphthalma. 
OI estoltace destitute olmacrochete.- 6.2.24 4-4-6 s~ cee cees ec cceee ees 52, 
Sides of the face each bearing two or three stout macrochete on the lower part. 
(p. 140) Peleteria. 
2. Second segment of abdomen never bearing more than six marginal macrochetex. 
(p. 141) Archytas. 
Second segment of abdomen bearing at least twelve marginal macrochetie.. 53. 
Palpi gradually thickening from the base outwardly, proboscis shorter than 
Melton yOimMead neers aie cones eet aes oes Ouse see Sacks sake eee 54, 
Palpi thickened on the apical three-fourths, proboscis beyond the basal articula- 
tion atleast one and one-third times as long as height of head. .(p. 146) Dejeania. 
. Outline of abdomen subquadrate, the apex deeply emarginate. 
(p. 146) Paradejeania. 
Outline of abdomen conical, the apex not distinctly emarginate-.(p. 146) Jurinia. 
5p. The ocellar bristles directed obliquely forward ..-.......-...---------------- 57. 
The ocellar bristles curving backward, very robust.-...-....---.------------ 56. 
56. Front opaque, the vitta deep brown or black.........-.... (p. 184) Spallanzania. 
57. 
Front shining, largely semitranslucent yellow, the vitta light yellowish. 
(p. 182) Gonia. 
Apical cell open, or, if closed, the petiole less than two-fifths as long as the hind 
COURCOY SISTA 0 SP HE Sa PR eee ee 58. 
Apical cell closed, the petiole at least two-thirds as long as the hind crossvein. 
(p. 126) Phoricheta. 
. Last section of fifth vein less than half as long as the preceding section... -.. 61. 
Last section of fifth vein almost as long as the preceding section, hind crossvein 
nearly midway between the small and the bend of the fonrth.............. 59. 
3dd09—No. 7 
9 
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