ORTALID7E. 115 



cell of considerable size, the latter exceptionally indistinct. 

 Middle tibiae alone provided with spurs; none of the tibiae 

 with an erect bristle before the tip exteriorly. 



The present family includes a large number of species of 

 flies that are sure to be represented in every collection of dip- 

 tera. Many of the species have the wings prettily marked. 

 The family by many entomologists is divided into several 

 independent groups, as the Doryceridae or Pyrgotinse, the 

 Platystomidae, Ulidiidae, etc. The flies are usually found 

 about meadows or among luxuriantly growing grass. The 

 larvse are but poorly known. 



TABLE OF GENERA. 



BY PROF. W. A. SNOW. 



1. First longitudinal vein beset with small bristles. .... 2 

 First longitudinal vein bare. ..... 5 



2. Ovipositor flattened ; ocelli present. . 3 



Ovipositor not flattened; no ocelli. ' . . . . PYRGOTIN^S. 



3. Third antennal joint round or short ovate; ends of auxiliary and first 



longitudinal veins widely separated. . . PTEROCALLIN.*:. 

 Third antennal joint not round or short ovate.* .... 4 



4. Neither pro-pleural or sterno-pleural bristles present; third antennal 



joint elongate ; PLATYSTOMINJE. 



A sternopleural but no propleural bristle present. . CEPHALIIN^C. 



5. Posterior angle of anal cell drawn out into a lobe, or at least, more or 



less acute ; femora never armed. ..... ULIDIINJE. 



Posterior angle of anal cell obtuse, rounded or retracted ; femora armed 

 in most of the getiera RICHARDIIN.*:. 



PYRGOTIN.E. 



Front strongly projecting; face retreating; oral opening small; probos- 

 cis not incrassated ; clypeus but little developed ; ocelli absent ; no pro- 

 pleural bristle ; first longitudinal vein hairy ; ovipositor not flattened. 



PYRGOTA Wiedemann. 

 PLATYSTOMINjE. 



Oral opening very large ; clypeus generally very much developed, and 

 the proboscis proportionately stout ; third antennal joint elongate; meso- 



* Tetropismenus Loe'w has the third antennal joint circular, but its short 

 stigma or subcostal cell locates it among the Ortalinae. 



