340 CHARLES T. BRUES. 



2. Third longitudinal vein black, much thickened, at its middle stouter than 



the costal vein, hind tibia with no seta on outer side near base. 



pachyneura Lw. 

 Third longitudinal vein fuscous, not unusually thickened 3. 



3. Fourth vein recurved at the tip, ending as far from the wing tip as the fifth. 



microcephala Lw. 



Fourth vein straight at apex, ending much closer to the wing tip than the 



fifth fratercula sp. nov. 



4. Thorax with a single pair of dorsocentral macrochaetae 5. 



Dorsum with two pairs of dorsocentrals comslocki sp. nov. 



5. Halteres black 6. 



Halteres yellowish or white 8. 



6. First, second and third veins ending very close together ?. 



First and second veins far apart at apex as usual, costal cilia long. 



groenlaiidica Lundbeck. 



7. Front very coarsely punctured throughout cimbicis Aid. 



8. Hind tibiae with four or more setae on outer side, besides the apical spurs • .9. 

 Hind tibiae with never more than three setae on the outer side before the 



apex. These when present very strong 13. 



9. Setae on hind tibiae four or five in number, very fine and slender, not as long 



as the width of the tibia- • . 10. 



Setae on hind tibiae very long and unusually stout, equalling the apical spurs 

 in size 11. 



10. Legs and pleurae yellowish incisnralis Lw. 



Legs and pleurae black or piceous nitidifrons sp. nov. 



11. Front tibiae with two serial unpaired setae near the middle of the outer side, 



posterior tibiae usually with seven or more long setae, abdomen wholly 



black spinipes Coq. 



Front tibiae with a single seta on outer side before the apex 12. 



12. Hind tibiae with five long setae on the outer side, the first two being paired 



and the others serial, abdominal segments with narrow, pale apical 

 borders scutellata sp. nov. 



Hind tibiae with four setae, a pair at basal third, one at apical third and one 

 just before the tip. Abdomen black thoracica Meig. 



Hind tibiae with a pair at basal third and a pair just before the. tip. 



luggeri Aid. 



13. Hind tibiae with one or more stout setae on outer side before the middle • . 14. 

 Hind tibiae destitute of such stout setae on outer side before the apex 17. 



14. Hind tibia with one stout seta on outer side below the knee 15. 



Hind tibiae with two stout setae on outer side before the middle 16. 



15. Head and thorax yellow, middle and bind tibiae with transverse comb-like 



rows of short black hairs m u II ixcriu I w sp. nov. 



Head and thorax black venusta Coq. 



16. Head black, thoracic dorsum and three apical segments of abdomen rufous. 



olj nipiic sp. nov. 



17. Front opaque, larger di varies! t a. var. perplexa, var. nov. 



Front shining, smaller, 1.4-1.8 mm divaricata Aid. 



