S3G biPTERA. 
guishable, even at the beginning of their 
change. 
Mother, The generality are certainly 
found to possess their proper form, in the 
very first stage of their transformation ; 
there are, however, several insects, whose 
imago form can scarcely be discerned 
at the beginning of their change. 
Lucy, I think you said there were 
other flies that were viviparous ; are their 
little ivorms also twisted up in bands ? 
Mother. No ; that circumstance is 
peculiar to a very few species. Let us 
now turn to the characteristic description 
of our two flies, that you may the more 
readily distinguish them. 
Musca vomitoria, blue flesh fly — eyes 
brown — plumes of the antennae branched 
— thorax black — abdomen dark glossy 
blue — legs black — length about half an 
inch. 
Musca carnaria, flesh fly — eyes red- 
dish — thorax black, with four grey 
lines — abdomen of fixe segments, che- 
