NO. 4 FEEDING MECHANISM OF LEPIDOPTERA SCHMITT 



21 



dilators is encircled by the frontal connectives. The remainder of the 

 pump dilators form four or more pairs of well-developed short muscles. 

 The pump musculature of the Yucca moth is poorly developed although 

 the pump floor is fairly well sclerotized. 



In a coleophorid (fig. lo A) practically the same type of pump was 

 observed, except that the dilators of the cibarium were grouped an- 



-PT 



\ HR 

 SoeCng 



Fig. 10. — The sucking pump. 



A, right half of head, mesal view, of Coleophora coruscipcnnclla, as exposed 

 by median sagittal cut. B, same of Carpocapsa pomonella. C, same of Smcrinthus 

 geminatus. D, same of Hcmaris thysbe. 



teriorly into a large median band of muscles, with a large band placed 

 laterally on the pump. An oecophorid, Agonoptcrix sp., has a similar 

 and well-developed pump. Males of the common bagworm moth, Thy- 

 ridopteryx ephemeraeformis, possess a very degenerate pump, with 

 the muscles evident but very weak. 



In the Tortricidae the axis of the sucking pump is inclined to a more 

 horizontal position. In the codling moth, Carpocapsa pomonella (fig. 

 lo B), there is a single large pair of pharyngeal dilators, and the dorsal 



