If 1 ^l ' N^,. 



Fig. 2. 

 Fiff 3. 



Fig. 4. 



Fig. 3. Fig. 4. Fig. 5. 



Fig. 1. Head of iiiAoco^Zeits larva of the flat and ornaUlla gxon^s,\\\ the first 

 five stages, and of the cj'lindrical group in the first three stages. 

 Mouth parts of fig, 1, much magnified. 



Head of larva of the fiat group after 5th moult, the labium and 

 maxillaj fully extended. They can be retracted until they are no 

 larger than the other organs. 



Same as fig. 3 in the latter part of 7th stage, the labium and maxillae 

 not extended, and showing the larval head emptied by the retrac- 

 tion of that of the pupa with C, maxillae; H antennae, and K 

 cephalotheca of pupa. 

 Fig. 5. Pupa of fig. 4 removed from larval skin, and with antennae H, 



and maxillae C, extended ; K, cephalotheca. 

 The lettering is the same in all the figures, viz: A, lower; B, upper tube ot 

 labium; C, maxillae, meeting across the upper surface of the 

 labium, and forming the floor of the mouth; D, maxillarj' palpi (?) 

 or supplemental teeth (?); E, mandibles; F, spinneret; G, labial 

 palpi; H, antennae; J, eyes. 



