636 



Mr. L. G. Saunders on the Larva, 



Body. — The body of the larva consists of three thoracic 

 and eight abdominal segments, the eighth being divided 

 into two apparent segments, as is so often the case in the 

 Nematocerous Diptera (de Meijere, 1919). Each segment 

 bears a peculiar dorsal ^^ saddle^' of reticulated chitin ; 

 histological preparations of fresh material are necessary to 

 reveal the true nature of this structure. 



Fiff. 2. 



I. Graphic saggital section of head to show relation of internal mouth- 

 parts, X 70. II. Hypopharynx, lateral view, X 200. %, hypo- 

 pharynx; Im, labium ; /r, labium ; ce-, oesophagus ; p/, pharyn- 

 lamelhie ; sd, salivary duct. 



The prothoracic segment bears an antero-ventral pseudo- 

 pod in the form of an undivided retractile evagination of the 

 wall of the venter, surmounted by a row of long, closely-set 

 hooks (PI. YII. fig. 2). Several rows of hooks of varying 

 sizes beneath the anus function as a posterior pseudopod 

 (Pi. VII. fig. 10). 



