142 R. W. CROSSKEY 



Key to Oriental Genera 



i Humeral callus with only two clearly differentiated setae. Frontal setae con- 

 spicuously reclinate. [Shining black forms lacking obvious pollinosity, except 

 at most for very narrow basal bands on abdominal tergites.] 



ELODIA Robineau-Desvoidy 



- Humeral callus with three or four setae. Frontal setae not reclinate. [Not such 



forms.] ............. 2 



2 Apical scutellar setae exceptionally large and subapical scutellar setae unusually 



weak in relation to other setae, the apical setae as large as or larger than the 

 subapicals and almost as large as the basal scutellar setae 



ATRACTOCEROPS Townsend 



- Apical scutellar setae weak and subapical scutellar setae of normal large size, the 



apical setae much smaller than either the subapical or the basal setae ... 3 



3 Hind tibia with a very strong pd preapical seta that is as large as or larger than the 



d preapical seta ............ 4 



- Hind tibia without a pd preapical seta or with a very weak inconspicuous setula in 



this position that is at most half as long as the d preapical seta .... 5 



4 Facial ridges strongly bowed and visible for their whole height in profile. Gena 



deep, more than one-third of eye-height. Abdominal T4 with discal setae. [Legs 



and basicosta reddish yellow.] . . . ER YTHROCERA Robineau-Desvoidy 



- Facial ridges straight and almost completely invisible except near the vibrissae 



when seen in profile. Gena narrow, less than one-fifth of eye-height. Both 

 intermediate abdominal tergites without discal setae. [Legs and basicosta black 

 or brownish black.] EURYSTHAEA Robineau-Desvoidy 



5 Wing vein R 1 entirely bare. [Legs and basicosta dark brown or blackish.] 



BACTROMYIA Brauer & Bergenstamm 



- Wing vein R 1 finely setulose along its apical half (dorsal surface only). [Legs and 



basicosta reddish yellow.] .......... 6 



5 Facial ridges setulose on half or more of their height, the ridges bowed in profile. 

 o* with proclinate orbital setae and third antennal segment simple. Humeral 

 callus with three setae. Apical scutellar setae minute, hair-like, usually directed 

 upwards and inwards (much weaker than the lateral setae) 



HAPALIOLOEMUS Baranov 



- Facial ridges bare, nearly straight in profile, o* without proclinate orbital setae 



and with the third antennal segment very deeply bifid (Text-fig. 51). Humeral 

 callus with four setae (i.e. with an additional seta set forwards from the basal row 

 of three setae). Apical scutellar setae moderately strong, horizontal and sub- 

 parallel (nearly as strong as the lateral setae) . . DIGLOSSOCERA Wulp 



FR ONTINA -group 



Head shape normal. Eyes bare or densely haired. Facial ridges setose on most of their 

 height (only slightly more than half in Lydellina), often well visible in profile. Parafacials 

 bare or haired on upper half. From one to three pairs of reclinate orbital setae. Upper 

 occiput flat, without black setulae behind the postocular row. $ with or without proclinate 

 orbital setae. Arista varied, either thickened only at base or for much of its length, sometimes 

 almost all thickened, basal segments either short or second segment elongate. Humeral 

 callus with three main setae in line or with middle one slightly forwards, sometimes with fourth 

 seta set forwards of basal row. 3 + 4 dc setae. Three or four stpl setae. Wing cell i? 3 

 open, closed at wing margin or very short-petiolate. Bend of vein M moderately to very 

 strongly abrupt. Second costal sector bare ventrally (except in Suensonomyia) . Mid tibia 

 with one or with more than one ad seta. Hind tibia with or without pd preapical seta. 



