1918] Dipterous Genus Drapetis Meigen 187 



the hind tibiae without the terminal spur; notum densely short- 

 pubescent, the hairs appressed, no humeral or discal bristles; wings 

 broad, costa short-pubescent, third vein sometimes curved forward; 

 halteres usually black. 



2. Eudrapctis, subgen. nov. Type species, spectabilis Melander. 

 Robust, larger species, more or less bristly and black; antennse longer, 

 directed obliquely upward, the second joint with a pronounced seta 

 beneath, the third joint ovate to lanceolate, with a long terminal arista; 

 femora with preapical bristles, anterior tibiae with apical bristles and 

 the hind ones with a more or less evident terminal spur and usually 

 with extensor or apical bristles; humeral, and sometimes discal bristles 

 {e. g., posthumeral, supraalar and anterior dorsocentrals) present; 

 wings broad, costa short-pubescent, third vein straight or recurved; 

 halteres yellow. 



3. Elaphropeza Macquart. Type species, ephippiata Fallen. Usually 

 yellow, sometimes black species; antennas elongate, horizontal, the 

 second joint without seta beneath, the third joint lanceolate, two or more 

 times the length of the first two joints together, the terminal arista 

 relatively short, sometimes no longer than the antennae; abdomen 

 broad, the middle segment with flattened setulae; legs slender, the hind 

 tibi« with extensor bristles and with a more or less evident terminal 

 spur; wings narrower, the hairs of the base of the costa longer than 

 elsewhere. 



4. Ctenodrapetis Bezzi. Type species, ciliatocosta Bezzi. Body 

 slender, elongate, usually yellow, the abdomen longer than the thorax; 

 antennae elongate, horizontal, the second joint without seta, the third 

 joint lanceolate with relatively coarsely pubescent terminal arista; 

 legs slender, with bristles and a long terminal spur on the hind tibiae; 

 wings long, narrow, cuneate, the costal margin with long cilia. 



Synopsis of the North American Species of Drapetis, s. lat. 



1. Legs mostly black, femora entirely or mostly black 2. 



Anterior femora more or less yellowish, in addition to the knees 23. 



2. Hind tibis without evident bristles, tibiae without apical spurs; halteres 



black; no dorsocentrals 3. 



Hind tibiae almost always with one or more bristles on the extensor side, 

 tibiae with apical spurs; halteres whitish 10. 



3. Anterior cross- vein before the middle of the discal cell, last section of the 



fifth vein much shorter than the preceding; third antennal joint short 



ovate 4. 



Anterior cross-vein beyond the middle of the discal cell, sections of the 

 fifth vein subequal 5. 



4. Wings hyaline, third vein uniformly diverging from the fourth; arista 



terminal assimilis Fallen. 



Wings infumated, third and fourth veins parallel toward their end: arista 

 subterminal infumata, n. sp. 



5. Third vein uniformly diverging from the straight fourth; pygidium not 



cleft; head higher than wide, the eyes nearly touching above the 



antennae, ocelli minute; mesonotal hairs short : 6. 



Third vein becoming subparallel with the fourth toward the end, the 

 fourth vein with a more or less evident downward bend beyond the 

 discal cell; head globular, the eyes distinctly separated above the 

 antennae, the ocelli large; mesonotum pubescent 7. 



