C. Gr. Hewitt 
1G7 
appendages of the larvae. In consequence the larvae have a very dirty 
appearance and their external featiu’es are almost hidden by the 
accumulated particles of dirt and filth adhering to them. 
The larval period may extend over a week or it may last for three 
or four weeks if the substances in which the larvae are feeding become 
rather dry. When fully grown it is covered fairly thickly with dirt, 
which is of great assistance in the formation of the pupal case, as this 
is formed of the larval skin. 
Fig. 4. Fannia canicidaris. Larva. Lateral view of cephalic region ; 
a. sp. anterior spiracular process. 
Fig. 5. 
Fig. 5. 
Figs. 5, 6. Fannia canicularis. 
Palmate and sessile dorsal appendage. Fig. 
Fig. 6. 
Larva. 
6. Posterior spiracular process. 
In changing into the pupa, the cephalic region is retracted and the 
length of the larva is thereby decreased. The larval skin, with its 
covering of dirt particles, forms the co-arctate pupal case. Befoi’e 
pupating the larva leaves the very moist substance in which it may 
have been living and seeks a dryer situation. The pupal period 
extends over a period of seven to twenty-one days, or longer, and it 
