SENSE-ORGANS IN ANTENN.E AND TALPI OF DIPTERA. 31 



6. A Comparative Study of certain Sense-Organs in the 

 Antennae and Palpi o£ Diptera. By K. M. Smith, 

 A.R.C.S., D.I.O.^ With Appendix by Professor H. 

 Maxwell Lefroy, F.Z.S. 



[Received August 18, 1918 : Read February 18, 1919.] 

 (Plates I.-IV. t and Text-figures 1-43.) 



Index. Page 



Introduction 31 



Material and Method 31 



General Description of the Sense-Organs under review ... 33 



Chief Modifications of the Sense- Pits 34! 



Situation of the Sense-Organs 36 



Correlation between Form of Sense-Organs and Habits 



of the Flies 35 



Function 36 



Sj'stematic Description of the Sense-Organs in the various 



Families 37 



Appendix „ 66 



References 68 



(I.) Introduction. 



This piece of work was begun at the suggestion of Prof. H, M, 

 Lefroy and Mr. F. M. Hewlett, It was originally to consist 

 merely of a comparison of the antennal sense-organs of Ccdli- 

 phora vomitoria and Musca domestica, but was enlarged to ccver 

 as many types of Diptera as possible. It was decided to make' a 

 comparative study of these sense-organs in the difierent families 

 and to correlate if possible their structure with the habits of the 

 insects. 



Several workers have picked out insects apparently at random 

 and figured their antennal sense-organs, but so far as I am aware 

 no one has yet made a systematic study and figured the type of 

 sense-oi"gan in each family. This I have endeavoured to do, and 

 though it may not have led as yet to discoveries relating to the 

 function of these organs, it should at least have some anatomical 

 and histological value. 



(11.) Material and Method. 



All the specimens examined were caught by myself in this 

 country. They were all taken alive and put direct into the 

 fixative. Several fixing fluids Avere tried : Carney's Fluid, second 



* (Joinuiunicatcd by Prof. II. Maxwel]j Liii'KOY, F.Z.S. 

 t For explauHtion of the Plates see p. 69. 



