TY - JOUR T1 - The morphology and inter-relationship of the genera of syrphid flies, recent and fossil JF - Transaction of the Zoological Society of London Y1 - 1949 A1 - Hull, Frank M. SP - 257 EP - 408 KW - Eristalinae KW - Microdontinae KW - Syrphidae KW - Syrphinae VL - 26 ER -