132 



PREDACIOUS AND PARASITIC 



Genus. 



25 Volucella (Geoff.) 



26 Sericomyia (Mg.) 



27 Arctophila (Schin.) 



28 Eristalis (Latr.) 



29 Myatropa (Reid) 



30 Helophilus (Mg.) 



31 Merodon (Mg.) 



32 Tropidia (Mg.) 



33 Criorrhina (Macq.) 



34 Pocota (St. Farg.) 



Number of 

 Species. Genus. 



Number of 

 Species. 



4 35 Brachypalpus (Macq.) 

 2 36 Xylota (Mg.) 



I 37 Syritta (St. Farg.) 



10 38 Eumerus (Mg.) 



I 39 Chrysochlamys (Reed) 



9 40 Spilomyia (Mg.) 



I 41 Chrysotoxum (Mg.) 



I 42 Callicera (Fab.) 



5 43 Microdon (Mg.) 



7 

 I 



3 

 2 



2 



7 

 I 



The following Genera comprise those which contain species known 

 or believed to be aphidivorous in the larval state : 



Chilosia (Meignen). 

 (Some larvae said to be aphidivorous.) 

 maculata, Fin. 

 antiqua, Mg. 

 sparsa, L. W. 

 pubera, Ztt. 

 soror, Ztt. 

 scutellata, Fin. 

 longula, Ztt. 

 pulcripes, L. W. 

 praecox, Ztt. 

 vernalis, Fin. 

 nebulosa, Ver. 

 chloris, Mg. 

 grossa, Fin. 

 chrysocoma, Mg. 

 flavicornis, F. 

 mutabilis, Fin. 

 fiavimana, Mg. 

 albitarsis, Mg. 

 impressa, L. W. 

 rostrata, Ztt. 

 variabilis, Pz. 



CH I Losi A — continued. 

 barbata, L. W. 

 vulpina, Mg. 

 olivacea, Ztt. 

 intonsa, L. W. 

 oestracea, L. 

 plumuHfera, L. W. 

 Syrphus (Fabr.) 

 Several larvae known to be aphidivorous. 



barbifrons, Fin. 

 lasiopthalmus, Ztt. 

 punctulatus, Ver. 

 umbellatarum, F. 

 compositarum, Ver. 

 flavifrons, Ver, 

 decorus, Mg. 

 auricoUis, Mg. 

 cinctellus, Ztt. 

 cinctus, Fin. 

 *balteatus, De G. 

 bifasciatus, F. 

 arcuatus, Fin. 

 lapponicus, Ztt. 



