EXPLANATION OF FIGURE 33. 



Syi'plius torvus Loew. 

 p Adult male, natural size and enlarged. 

 10 Larva, natural size and enlarged ; a, anterior spiracle ; b, posteri 



spiracle. 



/i Antero-ventral view of head and mouth-parts much enlarged ; a and 

 b, upper and lower jaws partially separated; c, outer pair of mouth 

 hooks ; d and e, two inner pairs of mouth-hooklets ; f , antenna ; g, 

 anterior spiracle ; h, sense papillae. 



12 Anterior spiracle of larva highly magnified. 



13 Posterior breathing appendages much enlarged; a, one of the six 

 caudal spiracles. 



14 Puparium from above, natural size and enlarged ; a, posterior spira- 

 cles. 



75 Puparium from side showing line of cleavage for escape of adult. 

 16 Head of female in profile. 





