AND MOUTH-PARTS OF CHLOROPS T.ENIOPUS. 
407 
and tlie cardines and stipites of the maxilla?, but the limits of the sclerites 
cannot be distinguished. The mediproboscis and the distiproboscis con- 
stitute the liguha. The hibeUoe are the paraglossfe, and between them are two 
■ inembranous lobes which are the glossse *. 
In the membranous basiproboscis of Chlorops only the stipites (figs. 1, 5, 
6, sf.y can be distinguished as separate sclerites. In the majority of 
Cyclorrhapha a distinct galea is found attached to the ventral end of each 
stipes, part of it appearing on the surface of the proboscis (the stipites lying 
Fig. 6. 
Veutia,! 
i)f labnmi, epipbarynx, and associated paits 
entirely within the proboscis). ''In the Calypteratte and some of the 
Acalypteratse the galea articulates with the proximal end of the labrum and 
is more or less firmly connected with the same. The ectal exposure of the 
galea is very small in these forms " (Peterson, p. 41). In Chlorojjs I have 
been unable to differentiate the galea?, and they have probably fused with the 
* Other views on the morphology of the proboscis are given by "VVescbe, W., " The 
Labial and Maxillary Palps in Diptera " (Trans. Lion. Soc, Zool. vol. ix. 1903-7), and by 
Crampton, G. C, "The Sclerites of the Head, and the Mouth-parts of certain Immature and 
■Adult Insects" (Ann. Ent. Soc. Araer. vol. xiv., 1921 j. The former author considers that 
the palpi ofMuscidje are labial and not maxillary. Crampton considtrs that the labella of 
Diptera are labial palps. 
