* LIST OF DIPTERA. 



b. Epistoma declive. 

 i. Scutellum bituberculatum. 26. Basentidema. 



ii. Scutellum non tuberculatum. 



1. Antennarum flagellum elongatum vel conicum. 



* Antennarum arista gracilis, nuda. 



27. Chrysochlora. 

 ** Antennarum arista crassa, basi 



pubescens. 28. Cacosis. 



2: Antennarum flagellum rotundatum vel ellipticum. 



* Antennae 6-articulatae 29. Sargus. 

 ** Antennae 7-articulatae. - - 30. Chrysomyia 



*** Antenna? 8-articulatae.- - 31. Pachygaster. 



J5. Antennarum articulus 3us furcatus. - . 32. Chauna 



The genera of this family present a great diversity of structure, 

 and will form several groups or sub-families which are here indi- 

 cated : — 



Group 1. 



Genera Ptilocera, Cyphomyia, Phyllophora, Acanthina, Platyna 

 Clitellaria, Cyclogaster, Oxycera. 



Group 2. 

 Beris, Actina, Diphysa, Exochostoma. 



Group 3. 

 Hermetia, Thorasena, Eudmeta. 



Group 4. 

 Stratiomys, Alliocera. 



Group 5. 

 Basentidema ? Nemotelus, Biastes, Metabasis. 



Group 6. 



Chrysochlora, Cacosis, Acrochasta, Sargus, Chrysomyia, Pachv- 

 gaster, Hoplistes, Dicranophora, Ilhaphiocera. 



Group 7. 

 Chauna. 



