<ii; TAl.lD.K. 117 



'2. Wintjs (lark, witli tliree oblique, more or loss nrciintcii, liyiilinc cross- 

 bands; first basal coll o.xpaiided before its end. Thitoxa Loew. 

 AVings not with such niarkinus. .......'■] 



'•). Winijs broad, with a marked excision on the costa near the end of the 



auxiliary vein; second vein sinuous. C^mptoneira Maeijuart. 



Flies not having such wings. . . . 4 



4. Posterior angle of the anal cell retracted. . . . Idana I.oew. 



Posterior angle of the anal cell drawn out into a long lobe. 



])t \(i:i r \ (lersla'ckcr. 



OKTALIX-K. 



The Ortalina; differ from the Platystoniina' and Ce]ihailina' in tlie small 

 oral opening, the less develo])ed clypeiis, more slender prol)Oscis and smaller 

 palpi. The mesonotum is sometimes bristly in the middle anteriorly, the 

 jiropleural and mesopleural bristles both ))resent. Female abdomen with 

 six segments. ' 



1. Face sharply carinate. . . . . . . . . . 2 



Face not sharply carinate. ........;! 



2. Third antennal joint circular ; hairy sjiecies. Tetkohismenis Loew. 

 Third antemial joint ending in a sharp ])oint: pollinose flies. 



Tei'Hronota Loew. 



-■). Mesonotum bristly in the middle in front; third antennal joint excised 



above and with a pointed tij). . . , ('icitoxvs Maccjuart. 



Mesonotum not bristly in the middle in front. .... 4 



4. Third antennal joint distinctly excised above, pointed at the tip ; fourth 

 longitudinal vein with a marked anterior curvature on its distal 

 I)art. ........ Anacami'Ta Loew. 



Third antenna! joint not excised above; fourtii vein not so curved; 

 body nearly destitute of bristles or hairs. . Ti-taxops l-"allen. 



PTKJtOCALLI N.K. 



Trypeta-like; coloring nonmetallie; head rather broad, but low, with 

 rather protuberant eyes; face short, perpendicular, excavated in the mid- 

 dle; clypeus but little developed; third antennal joint ronml or short oval : 

 mesonotum bristly upon the posterior part only; third longitudinal vein 

 hairy; tip of the first longitudinal vein and iiuxiiiary vein remote fmni 

 each other: posterior angle of tlii' anal cell usually drawn out into a long 

 lobe. 



1. Posterior angle of anal cell drawn out into a long lobe ; ])ostci-ior cross- 

 vein very oblique, ......... 2 



Posterior angle of anai cell not greatly jirodiiced. .... •■'. 



