Figures 572-582. — Cerodontha ( Butomomyza ) gibbardi : 
572, Head; 573, aedeagus , side view; C. (B . ) 
parvella : 574, Aedeagus, side view; C. (B. ) scirpi : 
575, Aedeagus, side view; 576, same, ventral view; 
£. (15. ) fusculata : 577, Aedeagus, side view; 578, 
epandrium; C. (B. ) impolita : 579, Aedeagus, side 
view (paratype, North Carolina); 580, sperm pump 
(holotype, Colorado); C. (B. ) impercepta : 581, 
Aedeagus, side view; 582, same, ventral view. 
394 
