26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



two slight, but distinct, rounded elevations on lower part. The la^t 

 two sefjregates I retain in Mineftia, the one with the facial eleva- 

 tions being the typical form. In the following key I include all 

 species known to me from the Orient, some of them being dependably 

 separable only by the structure of the male hypopygia. 



KEY TO THE SPECIES 



1. Sternopleura with but one distinct bristle; arista pubescent or very short 



haired; frons entirely shining; face flat (Minettiella, new subgenus) __ 2. 



Sternopleura with two distinct bristles; arista distinctly haired, the shortest 



hairs at least as long as half the width of third antennal segment ; frons 



largely dull; face usually with two slight elevations below 3. 



2. Dorsocentral bristles 1+3, acrostichals 1+4; raesopleura with an isolated an- 



terior bristle below middle atratula (de Meijere). 



Dorsocentral bristles 0+2 or 0+3, acrostichals the same; mesopleura with- 

 out an isolated anterior bristle below middle atrata (de ileijere). 



3. Face without distinguishable elevations below; male hypopygium with a 



stout, tubelike, downwardly projecting dentral process, and without 



heavily chitinizod inner hooks (Fig. 20) ; arista short haired 4. 



Face with a quite noticeable elevation on each side below; male hypopy- 

 gium without a tubelike central process, usually with two or four strong 

 black chitinous hooks or spines, which are more or less curved, and 

 generally asymmetrical ; arista plumose 5. 



4. Large species, fully 5 mm. in length ; hind tarsus with the basal segment 



slightly compressed in both sexes; ocellar bristles about twice as long as 



anterior orbitals tubifera Malloch. 



Smaller species, about 4 mm. in length ; hind tarsus with basal segment nor- 

 mal in structure in both sexes; ocellar bristles about as long as anterior 

 orbitals hoozanensis Malloch. 



5. Bases of wings quite distinctly blackened ; knobs of halteres black ; abdomen 



with distinct dusting on dor.sum 6. 



Bases of wings not blackened; knobs of halteres black; abdomen entirely 

 shining black, without distinct dusting ; hypopj'gium as Figures 21 and 22. 



nigrohalterata Malloch. 

 Bases of wings not darkened ; knobs of halteres yellow ; abdomen shining 



black, with grayish dusting evenly distributed 8. 



(j. Abdomen retldish testaceous, with evenly distributed grayish dusting. 



rufiventris (Macquart). 



Abdomen black, with grayish dusting, and a dark brown transverse band 



in middle of each tergite 7. 



7. Hind tibia with a distinct preapical dorsal bristle ; male hypopygium as 



Figure 23 fuscofasciata (de Meijere). 



Hind tibia without a preapical dorsal bristle ; male hypopygium as Figure 24. 



quadrispinosa Malloch. 



8. Wings grayish hyaline; anterior one of the postsutural pairs of dorsocentrals 



as close to suture as posterior pair is to hind margin ; hypopygium as 



Figure 25 obscura (de Meijere). 



Wings, halteres, and squamae and their fringes, honey yellow; anterior 

 pair of postsutural bristles much farther from suture than posterior pair is 

 1r(im hind margin 9. 



