50 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



84. Frous dull gray, yellow in front; legs stramineous, a brownish mark at 



apex of fore tibia on posterior side, and another near base of hind tibia 



on venlrnl side immaculata (de Mei.jere). 



Frons ochreous yellow, only the orbital stripes and ocellar region gray ; 

 legs .stramineous, fore femur with a brownish preapical mark on anterior 

 side along the bases of the anteroventral comb of setulae. 



circumcincta (Prey). 



85. Longest hairs on arista not over half as long as width of third antennal 



segment ; abdomen with a large black mark at apex on each side of each 

 tergite except the basal two, which is broadest at inner extremity and 

 tapers off outwardly, the inner extremities quite widely separated ; ocellar 

 bristles weak and short, hardly more than half as long as anterior or- 



bitals; cross veins of wings not clouded trifasciata (de Meijere). 



Longest hali-s on arista at least as long as width of third antennal segment ; 

 abdomen with one or two pairs of black spots, with some of the tergites 

 tripunctate, quadripunctate. or all impunctate 86. 



86. Abdomen with some distinct round, or subquadrate, black spots on at least 



one of the tergites, usually the fifth 87. 



Abdomen without distinct black spots on tergites, sometimes with a faint 

 central vitta or suffusion 95. 



87. Neither of the cross veins very evidently clouded 88. 



At least the outer cross vein of wing quite noticeably clouded, not conspicu- 

 ously so 92. 



88. Abdomen with three black spots on fifth tergite and five on sixth ; ocellar 



bristles as long as anterior orbitals; hypopygium as Figure 81. 



immaculipennis, new species. 



Abdomen without a central black spot on fifth and sixth tergites, but with 



two or four such spots on at least the fifth 89. 



89. Ocellar bristles as long as anterior obrltals ; penultimate section of fourth 



vein fully two-thirds as long as ultimate 90. 



Ocellar bristles much shorter than anterior orbitals; ptmultimate section of 



fourth vein but little over half as long as ultimate 91. 



itO. Abdomen with n pair of black spots on fifth tergite and another on sixth, 

 and in addition a spot on lateral margin of each of these tergites. 



signata (van der Wulp). 



Abdomen with a pair of black spots on fifth tergite, none on sixth or on 



lateral margins of either fifth or sixth neosignata, new species. 



91. Third antennal segment entirely yellow Woculata (de Meijere). 



Third antennal segment infuscatetl on apical half kerteszi (de Meijere) 



92. Abdomen with a median black spot on fifth and sixth tergites, and two 



pairs of similar spots on each side of it, the outer one on lateral margin, 

 the submedian one on sixth tergite very small, subobsolete; uppermost 

 hair in the series on lower part of sides of face much stronger and longer 



than the others mediosignata (Fray). 



Abdomen without median black spot on fifth and sixth tergites, the spots 

 submedian and paired 93. 



93. Abdomen with but one pair of shining black spots ; mid femur in male 



with a series of long hairs on posteroventral surface which are fine at 

 base and become bristlelike beyond ; apices of longitudinal veins very 

 slightly browned, that of second most obviously so. 



biguttata (Macquart). 



Abdomen \\'ith two pairs of black spots; mid femur of male without long 



posteroventral hairs or bristles ; apices of veins not clouded 94. 



