ART. 9 DIPTERA FEOM AMERICA, ASIA, AND JAVA ALDRICH 6 



KEY TO SPECIES OF OCNAEA 



1. Third antennal joint clavate 2 



Third antennal joint of uniform width, slightly tapering 3 



2. Legs brown, knees yellow (Mexico) micans Erichson 



Legs yellow (Texas) loewi Cole 



3. Third antennal joint with scattered hairs on upper edge 



(Panama) trichocera Osten Sacken 



Third antennal joint bare 4 



4. Third vein not forked 5 



Third vein with widely divergent anterior fork near tip, about 



as in Tabanus 7 



5. Mesonotum luteous, legs brown (Brazil) calida Wiedemann 



Mesonotum black on disk, legs yellow 6 



6. Scutellum yellow, third antennal joint comparatively short, less 



than height of eye (Brazil) tumens Walker 



Scutellum black, third antennal joint very long, exceeding 

 height of eye (Brazil) longicornis Erichson 



7. Femora yellow 8 



Femora more or less infuscated 11 



8. Mesonotum yellow (Texas) auripilosa Johnson 



Mesonotum black, or with distinct dark area 9 



9. Second, third, and fourth abdominal segments reddish yellow 



with a decreasing row of black spots in middle (Honduras). 



flavipes Aldrich 

 Second, third, and fourth abdominal segments with basal trans- 

 verse black bands 10 



10. First posterior cell petiolate by the union of the third and 



fourth veins before margin ; adventitious cross veins present 

 in marginal, and first and fourth posterior cells (Texas). 



helluo Osten Sacken 

 First posterior cell united with second near tip by the disap- 

 I)earance of the fourth vein near base of second cell ; no ad- 

 ventitious cross veins (the one dividing the first posterior is 

 not here regarded as adventitious) (Cuba) schwarzi Cole 



11. Mesonotum yellow with three broad black stripes confluent 



behind, the outer much abbreviated in front ; scutellum dark 



yellow (Honduras) trivittata, new species 



Mesonotum wholly black or blue except more or less of lateral 



margins ; scutellum concolorous 12 



12. Abdomen metallic blue with narrow interrupted apical yellow 



cross bands on second, third, and fourth segments (Texas) —coerulea Cole 

 Abdomen brown, hind edges of same segments indistinctly paler 



(Brazil) lugubris Gerstaecker 



Abdomen without cross bands, except a broad one on second 



segment 13 



13. Blackish in color, with reddish third antennal joint (Ecuador). 



falcifer Aldrich 

 Brown in color, third antennal joint almost black (Ecuador) — gigas Aldrich 



