IN THE ANTENNvE AND PALPI OF DIPTERA. 



43 



ORTHOIIHAPHA. BRACK YCERA. 



Leptid.e (Text-figs. 9-16). 



In Leptis scolopacea (C. G. Lamb det.) there are two types of 

 sensory processes, large ones arising directly from the surface and 

 smaller ones of somewhat irregular shape sunk deeply in pits 

 and not reaching to the surface, i. e. the coeloconic type. In 



Text-fieure 9. 



^H. Nu. 



Transverse section of the palp of Leptis tringaria. X 980. 



L. tringaria (C. G. Lamb det.) one type of sensillus only was 

 seen, i. e. coeloconic. In the palp there is a well-marked sense- 

 pit, and beneath it a mass of radiating cells with a few large 

 nuclei (text-fig. 9). The sensory processes are long and some- 

 what spatulate. 



Stratiomyid.e (Text-figs. 10-12). Species examined deter- 

 mined by 0. G. Lamb. 



Text-fig. 10 shows a longitudinal section through one side of the 

 antenna of Oxycera trilineata F. In this species there are not 

 pits sunk below the surface, but gi-oups of large sensory processes 

 projecting above the chitin and protected by large and thick 

 chitinous spines. These sensory processes resemble two hands 

 placed palm to palm with the fingei-s directed slightly inwards ; 

 in some cases, however, there are only two or three processes. 

 These " hands " are duplicated on the other side of the antenna. 



