FAMILY TACHINID.E THE TACHINIDS 431 



84. Arista pubescent or bare 100 



Arista at least short plumose on basal half 85 



85. Oral margin distinctly produced 9G 



Oral margin scarcely prominent, the face almost vertical 86 



86. Width of clypeus much greater than width of third antennal segment. 87 

 Width of clypeus not greater than width of third antennal segment. 



Macrometopa Brauer & Bergenstamm 



87. Parafacials with hair 92 



Parafacials bare 88 



88. Ocellars long and strong 91 



Ocellars hairlike 89 



89. First vein bare 90 



First vein bristled Gymnopalpus Townsend 



90. Arista short plumose on whole length; no di seals on intermediate seg- 



ments; first segment without marginals Pseudochaetona Townsend 



Arista short plumose on basal half only; abdomen with discals, the 

 first segment with marginals (186, 190) Chaetonalia, n. g. 



91. Aristal rays as long as the width of the third antennal segment. 



Ebenia Macquart 

 Aristal rays about half as long as the width of the third antennal 

 segment ( 169, 191 ) Canalia, n. g. 



92. Antennae reaching more than half way to the oral margin 93 



AntennjB reaching only half way to oral margin; prosternum with a 



pair of bristles Myoceropsis Townsend 



93. Hair of parafacials coarse 94 



Hair of parafacials very fine; first vein bare (121, 134) .Cholomyia Bigot 



94. Apical cell ending near the wing-tip 95 



Apical cell ending far before the wing-tip Microchaetina Wulp 



95. First vein setose (154, 180) Schwarzalia, n. g. 



First vein bare Parazelia Townsend 



96. Proboscis, measured from base of apical section, at most slightly 



longer than length of oral opening 97 



Proboscis twice as long as length of oral opening. 



Mochlosoma Brauer & Bergenstamm 



97. Apical cell closed and short petiol^ls 98 



Apical cell broadlv open (Clinoneura, B.B.; Paramyocera Towns.) 



(119, 124, 125, 133) *Rhynchiodexia Bigot 



98. Third vein setose less than half way to the anterior crossvein 99 



Third vein setose to the anterior crossvein Megerlea Desvoidy 



99. Bend of fourth vein with long appendage Hypenomyia Townsend 



Bend of fourth vein with at most a very short appendage. 



Dinera Desvoidy 



100. Face without a very prominent carina appearing above the antennae 



in profile 101 



* Curran, 1930, Bull. Amer. Mus. Nat. Hist., Ixi, p. 93. 



