30 Transactions of the Society. 



(b) With no remains of maxillary palpi. 

 Lonchopteridre. 

 Pipunculidce. 



Some Tachinidce ) Particularly highly modified 

 Some Muscidse ) genera, as Siphona or Stomoxys. 

 Some Anthomyidoe. (Type C. erythrocephala Mg.) 

 Cordyluridse. 

 OrtalidaB. 

 Trypetidse. 

 Loncheidse. 

 Chloropodee. 

 Hippoboscidse. 



Group 6. — The mandibles are fused into the labium ; the car- 

 dines, stipites and lacinire of the maxillae are present, the latter 

 leaf-shaped and pubescent ; the paraglossoe are without teeth ; the 

 palpi are labial. 



Phycodroniidre. (Type C. frigida Mg.) 



Helomyzidse. 



Sciomyzidre. 



Sapromyzidae. 



Group 7. — The mandibles are fused into the labium ; the 

 maxilhe are embedded, the palpi being the only part exposed, 

 labial palpi also present ; the trachea of the paraglossee are more 

 or less well developed. 



Opomyzidoe. 



Sepsidre. 



Ephydridae. 



Drosophilidse. 



Borboridre. (Type B. eauinus Pin.) 



Group 8. — All parts atrophied. 

 (Estridse. (Type G. equi F.) 



I propose making remarks on the trophi of these various 

 families, each in its group, which will facilitate reference for those 

 who wish to consult the paper on some particular family ; but 

 before doing so it will be of service to explain a diagram of a 

 hypothetical mouth. This has mandibles, complete inaxillce, 

 which only differ from those found in Hydrcllia griscola by the 

 presence of four joints in the palpi; a labium, also with four- 

 jointed palpi, and which has incorporated into its paraglossa? the 

 transverse levers which I homologise with the ligulai • a well- 

 marked labrum covering the hypopharynx, which is ciliated, with 

 levers at the base which represent the submentum. This part is 

 also known as the " fulcrum." The mentum is not prominent as 



