Vlll 



PAGK 



Keys to families: — 



Larvse 308 



Pupge 310 



Imagines 312 



Tribe Platygenya 314 



Stratiomyioidea 314 



Stratiomyiidag 315 



Key to subfamilies 316 



Stratiomyiinae 317 



Clitellariinas 322 



Beridinse 331 



Geosarginse 331 



Pachygasterin^ ' 334 



Xylomyiinae 340 



Principal papers on North American Stratiomyiidse 346 



Xylophagidse 346 



Coenomyiidse 351 



Acanthomeridae 354 



Tabanoidea 354 



Tabanidae 355 



Principal papers dealing with the biology of North Amer- 

 ican Tabanidae 361 



Leptidae 362 



Cyrtoidea 368 



Nemestrinidae 368 



Cyrtidae 368 



Papers on North American Cyrtidae 369 



Asiloidea 369 



Mydaidae 370 



Apioceridse 373 



Asilidse 373 



Bombyliidae 389 



References to Descriptions of larvae and pupae of North 



American Bombyliidge 395 



Therevoidea 396 



Therevidse 396 



Scenopinidas , 398 



Tribe Orthogenya 399 



Empididoidea 399 



Empididae 400 



Papers on the biology of North American Empididae 403 



Dolichopodldae 403 



References to papers on the biology of North American and 



European Dolichopodldae • 406 



