Key to Notiothereva species

1. Frontal setae extending lateral to antennal base; parafacial with setae; gena lacking anterodorsal patch of short, dark setae .......................................................................... 2

­ Frontal setae absent lateral to antennal base; parafacial lacking setae; gena with anterodorsal patch of short, dark setae .......................................................................... 4

2. Dorsocentral macrosetae present; halter dark brown; tibia dark yellow, apex dark reddish brown; setae on frons and parafacial predominately white; cell m 3 closed ........... 3

­ Dorsocentral macrosetae absent; halter pale yellow; tibia dark brown, concolorous with femora; setae on frons and parafacial dark brown; cell m 3 open narrowly; Argentina .......................................................................................................... simulata (Malloch)

3. Mesonotal setae white and dark brown intermixed with appressed, short, gold setae; setae on scutellum white; cervical sclerite lacking setae; setae on male tergite 8 contin­

uous across posterior margin; Argentina, Chile ............................. albiventris (Philippi) ­ Mesonotal setae black intermixed with gold, appressed setae; setae on scutellum gold; cervical sclerite setae white on lateral fourth; setae on male tergite 8 absent medially on posterior margin; Chile ........................................................... aurea Webb spec. nov.

4. Forefemur with anterodorsal macrosetae; female frons with dark reddish brown calli, glossy; Peru ............................................................................................ bezzii (Kröber)

­ Forefemur lacking anterodorsal macrosetae; female frons lacking glossy calli ........... 5

5. Wing cell m 3 closed, petiolate; fore­ and midcoxa with macrosetae yellow to dark yellow; halter dark brown (occasionally pale yellow); posterior margin of male sternite 8 (Fig. 10) deeply emarginate, setae absent medially on posterior margin; cervical sclerite lacking setae; Argentina ................................................... argentina Webb spec. nov.

­ Wing cell m 3 open widely; fore­ and midcoxa with macrosetae dark reddish brown (occasionally pale); halter pale yellow; posterior margin of male sternite 8 (Fig. 31) slightly emarginate; cervical sclerite with setae on lateral fourth; northern Chile .......... .......................................................................................................... brunnipes (Kröber)