Figures 184-195. — Ophiomyia congregata : 184, Head; 
185, aedeagus, side view; 186, same, ventral view; 
0. frosti : 187, Aedeagus, side view; 188, same, 
ventral view; 0. tiliae : 189, Aedeagus, side view; 
190, same, ventral view; 191, epandrium with 
cercus; 192, twig galls on Tilia americana ; 0. 
fastosa : 193, Head; 194, aedeagus, side view; 195, 
same, vertical view (Colorado). 
357 
