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PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



150 



152 



.•o \ / o. 



153 



Figures 149-156. — 149, Xylomya americana, first abdominal segment, dorsal view; 150, 

 X. americana, apical segment, ventral view; 151, Merosargus caerulifrons, apical segment, 

 ventral view; 152, Cyphomyia marginata, head, dorsal view; 153, C. marghiata, first ab- 

 dominal segment, dorsal view; 154, C. marginata, apical segment, ventral view; 155, 

 Adoxomyia rustica, first abdominal segment, dorsal view; 156, A. rustica, apical segment, 

 ventral view. 



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