138 C. H. TYLER TOWNSEND. 



65. Proboscis long, bristle-like ; apical cell rather loug petiolate. 



C/hsetoglossa Twus. 

 Proboscis fleshy, short and stout; apical cell short petiolate. 



Olenocheeta Twus. 



66. Front only a little produced.* fourth vein without stump 67. 



Front extraordinarily, strongly conically produced ; fourth vein with stump. 



abdomen conical Itletopia Mg. 



67. Arista not distinctly jointed, or if so, then proboscis short and stout 68. 



Arista 3-jointed, often bent, second joint elongate; proboscis elongate, 



slender Acroglossa Will. 



68. Head and front swollen; abdomen elongate, round 69. 



Head not swollen ; abdomen conical or oval ; apical cell ending rather more 



before wing tip Prospherysa v. d. W. 



69. Sides of face bare, or only hairy Froiitiua Mg. 



Sides of face with bristles of nearly same strength as those of front (as in 



CnephaHa and Gonia) Euciieplialia Twns. 



70. Apical cross-vein obliterated, or only a weak spur present, fourth vein where 



it usually bends obsolete! (Eoeseliinse) 71. 



Apical cross-vein always present and complete 72. 



71. Third antennal joint greatly widened, especially at the truncate tip, trian- 



gular; first two aristal joints elongate Euryceroiiiyia Twns. 



Third joint normal, basal joints of arista short Roeselia E. D. 



72. Apical cell open (Thryptoceratinse) 73. 



Apical cell closed, and usually long petiolate (Phytoinse) 95. 



73. Eyes naked 74. 



Eyes hairy 89. 



74. Proboscis bristle-like, widely protruded, twice geniculate, the forward part 



bent back Siphoiia Mg. 



Proboscis not twice geniculate 75. 



75. Arista distinctly 3-jointed, more or less geniculate;! oue or more of the 



wing veins usually spined its whole length 76. 



Arista apparently 2-jointed, never geniculate; longitudinal veins not at all, 

 or only the third bristly at base 77. 



76. Proboscis slender, sharp at tip, labella not developed ; arista strongly genicu- 



late, second joint more than half as long as last...Oiiiglyiiiia Twns. 



Proboscis short, fleshy, labella well developed ; second aristal joint but little 



elongate Thryptocera Mcq. 



77. Face (including sides of face) more or less recedingH 78. 



Face straight, or scarcely receding 85. 



* The front may be broadened or swollen, but not produced anteriorly. 



t According to Schiner, the apical cross-vein is wanting in the European 

 Thryptocera frontalis. This form should be separated from Thryptocera, and 

 placed in a separate genus among the Eoeseliinse. 



J One European species of Thryptocera, according to Schiner, does not have 

 the arista distinctly 3-joiuted ; but in such event, the bristly wing veins serve 

 to indicate the genus. 



II Anisia is said in the generic description to have the face perpendicular, but 

 is included here. 



