312 DIPTERA. 
Mother, Yes ; but calves and lambs 
are weak and small ; tbey are not a 
tenth part of the size to which they after- 
w^ards attain. Their bodies have not the 
same shape, or proportions, which they 
bear when full grown, and in some parts 
they are quite imperfect ; as, for instance, 
their teeth and horns. But the animal, 
to which I allude, is complete, and issues 
full sized from the egg. 
Lucy, Then the mother does lay an 
Mother, She does ; this g^^ is about 
the size of a common pea, white at one 
end, and black at the other, and full as 
large as the parent fly. 
Lucy. Then it never goes through 
the stages of larva and nymph ? 
Mother, It has been suggested, that 
these changes have already taken place 
before the e^g is laid, and that the fly 
is then in the nymph state. 
Lucy, What is the name of this 
curious fly ? 
Mother, Hippobosca equina. It is 
