Kahl: The Dipterous Genus Leucophenga Mik. 371 



of equally minute, but stiff, sctulae close to the eye from the lower edge 

 of the front to the lower rerlinate fronto-orbital bristle (or sometimes 

 beyond it). In L. ambigua sp. nov. the central rows are not so placed, 

 but apparently in three transverse rows, as minute black setulse. 



Key to the Species of Leucophenga Mik Described Below 



1. Postvertical bristles minute, hairlike 2 



Postvertical bristles very strong; wings without spots; second vein straight. 



ambigua sp. nov. 



2. Second vein distinctly curved apically; wings with brown spots; abdomen without 



black spots 3 



Second vein straight, or indistinctly curved; wings with or without spots; abdo- 

 men with or without black spots 5. 



3. Wings with a basal and apical spot and an irregular median band, spots and band 



brown; abdomen blackish with a silvery band argenteo-fasciata sp. nov. 



Wings with brown, separate spots at base, on apex of second vein, and on anterior 

 and posterior cross- veins 4. 



4. Spot on apex of second vein longitudinally oblong; apex of third vein brown; 



abdomen silvery white; length 2.5 mm argenleiventris sp. nov. 



Spot on apex of second vein longitudinally oblong; apex of third vein brown; 



abdomen yellowish (unicolored?); length 3 mm haseniani sp. nov. 



Spot on apex of second vein spherical; apex of third vein yellow, not infuscated; 



abdomen blackish brown with yellow spots; length 3 mm . . maculosa Coquillett. 



5. \Mngs from base with two diverging brown stripes; second vein straight. 



histriala sp. nov. 

 Wings otherwise marked 6. 



6. Abdomen j^ellow with black spots in longitudinal series 7. 



Abdomen otherwise marked 8. 



7. Wings with two brown spots, one at base and one at apex of marginal cell. 



quadritnaculata Walker. 

 Wings hyaline without spots ornaliventris sp. nov. 



8. Abdomen blackish, base and apex pale j-ellow; wings subhyaline, brown along 



costa goodi sp. nov. 



Abdomen blackish, unicolored; wings mostlj- brown anteriorly; second vein 

 straight hrunneipennis sp. nov. 



I. Leucophenga argenteo-fasciata sp. nov. 



Diagnosis: Head and antennae ytUow, palpi large, black. Meso- 

 notum and scutellum brown-red; legs and halteres yellow. Abdomen 

 above black with a silvery-white transverse band. Wings yellowish 

 hyaline with a large basal and apical spot and a median transverse 

 band, all dark brown, second vein gently curved on its apical half. 

 Length 3.5 mm. 



