FAMILY HIPPOBOSCID.T; THE BIRD PARASITE FLIES 475 



Aldrich* has published a key to the genera but the species are very 

 difficult to determine, there are no keys to the American species, 

 and although most of them have been figured, the illustrations and 

 descriptions are scattered. 



KEY TO GENERAf 



1. With functional wings, longer than abdomen 2 



Wings rudimentary, broken off or absent 12 



2. Wing with five or six distinct veins behind the costa 3 



Wing with only three distinct veins behind the costa, the first, third and 



fifth Lipoptena Nitzsch 



3. Anal cell closed by a crossvein (4) 4 



Anal cell open apically (2) 9 



4. Ocelli present 6 



Ocelli absent 5 



5. Claws bidentate; head rounded behind and free from thorax (not 



naturalized in America) Hippobosca Linnaeus 



Claws tridentate; head truncate behind, in a deep emargination of the 

 thorax ( 1 ) Stilbometopa Coquillett 



6. Third vein joining the tip of the costal vein at a distinct angle; claws 



tridentate 7 



Third vein confluent with the costal vein on the apical third; claws 

 bidentate (4) Ornithoica Rondani 



7. Antennal processes two-thirds as long as the head, straight and parallel 



with each other, broadly rounded at tip Ornithopertha Speiser 



Antennal processes much shorter, more or less pointed 8 



8. Antennal processes broad, concave above, with projecting outer rim, 



curved inwardly so as to almost or quite touch each other (7). 



Ornithoctona Speiser 

 Antennal processes narrow, without outer rim, divergent and curving 

 downward (5, 6) Ornithomyia Latreille 



9. Crossvein closing the second basal cell entirely absent (2) 11 



Crossvein closing the second basal cell at least half present (3) 10 



10. Lateral lobe of the metanotum swollen and bearing a mammiform 



process; fourth vein setulose (see text figure) Olfersia Wiedemann 



Lateral lobe of metanotum less swollen and without processes; fourth 

 vein bare (3) Lynchia Weyenbergh 



11. Ocelli entirely absent; scutellum angulate laterally (2). 



Pseudolynchia Bequaert 

 Ocelli occasionally present but minute; scutellum convex posteriorly. 



Microlynchia Lutz, Neiva and Costa Lima 



12. Halteres present 13 



Halteres absent; wings aborted, reduced to short knobs. 



Melophagus Latreille 



13. Ocelli present, claws bidentate; with basal stumps of broken wings. 



Lipoptena Nitsch 

 Ocelli absent, claws tridentate; wings present, much shorter than the 

 abdomen. (Brachypteromyia Williston) Myophthiria Rondani 



1923. Ins. Ins. Menstr., xi, pp. 

 Ched-ed by Dr. J. Bequaert. 



