FAMILY CALOBATID.T: THE STILT-LEGGED FLIES 305 



KEY TO GENERA 



1. Anal cell extending- two-thirds the distance to the wing margin, its 



anterior edge very oblique ( 16 ) 2 



Anal cell much shorter, the crossvein much less oblique 5 



2. Distance between the tips of the second and thii'd veins more than 



half as great as the length of the ultimate section of the fourth 



vein (16) 3 



This distance less than half the length of the ultimate section of the 

 foui'th vein (1, 10) Parasphen Enderlein 



3. Arista bare 4 



Arista plumose or long- pubescent (2, 19) Ptilosphen Enderlein 



4. Apical cell closed and short petiolate (12, 16) Taeniaptera Macquart 



Apical cell open (7, 15 ) Grallomya Rondani 



5. Arista bare G 



Arista plumose 9 



6. Distance between the tips of the second and third veins equal to less 



than half the length of the ultimate section of the fourth vein 



(4, 9) Scipopus Enderlein 



This distance greater than half the length of the ultimate section of 

 the fourth vein 7 



7. Postocellar bristles absent (8, 14) Hoplocheiloma Cresson 



Postocellar bristles present, vertex with six bristles 8 



8. Occiput strongly produced on either side of the vertex, concave in the 



middle from dorsal view Mitromyia Cresson 



Occiput at most weakly produced and very greatly concave from dorsal 

 view (3, 18) *Rainieria Rondani 



9. Posterior femora very conspicuously swollen on the apical third (6, 



13, 21 ) tCardiacephala Schiner 



Posterior femora regular in outline 10 



10. Postocellar bristles absent 11 



Postocellar bristles long and strong (5, 17) Grallipeza Rondani 



11. Stigmal cell long, the first vein ending in front of the anterior cross- 



vein Calobatina Enderlein 



Stig-mal cell short and not distinct, the first vein ending- well before 

 the anterior crossvein (11, 20) Calobata Meigen 



* Tanypoda Rondani is a synonym and I do not believe that the characters cited by 

 Cresson for his yrenus Meganeria are of sufficient value to constitute a genus. 



t The dorsal view of the head shows the extreme development of the lobe-like production 

 of the posterior orbits which may not be produced beyond the vertex. Khoeciiis (Enderlein) has 

 been proposed for this latter group but there is every gradation between the two extremes. 



