248 



NORTH AMERICAN DIPTERA 



SyrphidiE I. — 1, Microdon ; 2, Orthoneura nitida; 3, Orthoneura nitida, antenna; 4, 

 Chrysogaster nigripes, antenna; 5, Paragus; 6, Pipizella, antenna; 7, Paragus, antenna; S, 

 Cheilosia; 9, Syrphus laxus ; 10, Syrphus laxus, antenna; 11, Salpingogaster ; 12, Volucella; 13, 

 Volucella, antenna; 14, Copestylum marginatum, antenna; 15, Arctophila flagrans ; 16, Seri- 

 comyia militaris, antenna; 17, Eristalis; 18, Elophilus fasciatus ; 19, Tropidea quadrata, hind 

 leg; 20, Milesia, hind leg; 21, Spilomyia longicornis; 22, Spilomyia longicornis, antenna; 23, 

 Chrysotoxum, antenna; 24, Cerioides, antenna. 



