36 



92. Front destitute of backwardly curvin<!; iiiacrocha'ta- outside of the two froutal 



rows 93. 



Frout in each sex bearing two or three pairs of backwardly curving uuvcro- 

 cba'tie outside of the reguLir froutal rows (p. 116) rseudochwta. 



93. Beud of fourth vein bearing a long appendageor distinct fold . (p. 101) •**p/iQ/o(rr«. 

 Bend of fourth vein destitute of an appendage or fold (p. 102) ]'ho'rofr r n . ■^ "^^ 



94. Sides of face at narrowest part less than one-third as wide as the median 



dei)ression 96. 



Sides of face more than one-half as wide as the median depression 95. 



95. Head at the vibrissa^ much shorter than at base of antenna-, bend of fourth vein 



destitute of an apiiendage..s^. t>j^it6'>.0i*#>t^<l.''A'7."*r.. (p. 89) Macromeiyenia. 



Head at the vibrissa' as long as at base of antenna-, bend of fourth vein bearing 



^an appendage (P- 89) Meiaphnto. 



96. Diameter of head at the vibrissa' much shorter than at base of antenna-, bend of 



fourth vein destitute of an appendage 97. 



Diameter of head at the vibrissa- as long as at base of autennas 98. 



97,^ Froutal bristles descending at least to last third of the second antennal joint. 

 '<- N^e--' ^ K^ v*i — . u>'i ^(, Jt c-h*— » L (p. 91) Exorista. 



Frontal bristle* not/tlesc^ulmg below tlie base of the second antennal joint. 

 ja 1 (p. tj4) Maeqnartia. 



9S. M as C of fourth vein bearing a long ai)pendage; second and third segments of the 



abdonieiw^stitute of discal macrocha-ta^ (p. 87) Xeinorwa. 



liend of fourth A'ein at most with an extremely short appendage, second and 



third segments of abdomen bearing discal macrocha'ta' (2).88) Punzeria. 



99. Antenna- reaching at least the lowest fourth of the face 110. 



Antenna- not reaching below the lowest third of the face 100. 



100. Vibrissie at less than one-half the length of the second antennal joint above 



the level of the front edge of the oral margin 108. 



Vibi'issa- inserted at least the length of the second antennal joint above the lev(d 

 of the front edge of the oral margin 101. 



101. Lowest frontal bristles below middle of the second antennal joint 105. 



Lowest froutals not below base of the second antennal joint 102. 



102. Cheeks less than one-third as 1)road as the eye height, arista never thickened 



ou more than the basal third 103. 



Checks almost as broad as the eye height, arista thickened nearly to the tip, 

 abdomen shining, not poUinose (p. 85) Mtlauophnjs. 



103. Frontal bristles in two rows lOL 



Froutal I)ri8tle8 in four rows (p. 79) Pach iiophthalmus. 



104. Diameter of head at the vibrissa' as long as at base of anteuujc, lower front 



angle of the third antennal joint not prolonged in the form of a tooth. 



(p. 80) Senotainia. 

 Diameter of head at the vibrissa' much shorter than at base of antenna', lower 

 front angle of the third antennal joint^prolonged into a sharp tooth. 



105. Ocellar bristles present, directed obliquely forward 106. 



( )ccllar bristles wanting . . .tV* .'^A'^.l . r.'.i A eJ...y. fj. ?/.V^ . . . (p. 84) lielvosia. 



lOt). Hind tibia' not distinctly ciliate outwardly /T. .-f;-!-,-^ 107. 



Hind tibia' outwardly ciliate with bristles, apical cell open (p. 83) Atucta. 



107. Ai»Tc!tl>-*a41c)p«»M"t^ ^•j-t\A.-/> {• (l»'81) Biomyia'\ 



ApicaL-c€lTcloseli-»nxl short petiolate t^P- 8 1 ) Pseudotractocera.J 



108. Pair of lowest frontal bristles not below base of second antennal joint 109. 



Pair of lowest froutals below middle of second antennal joint, froutal bristles 



in two rows (p. 83) Atarta. 



109. Frontal bristles in ibur rows (j). 79 ) /'iichnophthdlmits. 



Frontals iu two rows .T-ClTT. ? . b jil £ . . .C fi.tr.: . . (p. 122) Paraphi/to. 



