DEVELOPMENT AND IMMATURE STAGES. 183 



I believe the above to be a correct account of the 

 change of skin, and to be on the whole applicable to 

 other species of the family which I have observed; 

 such as Tyroglyphus siro, Histiog aster entomophagus, etc. 

 I do not think that the old legs are always stretched 

 out as Nalepa says ; I frequently find them curled 

 under the body. Some time before the new creature 

 emerges I have often seen its legs being slowly moved 

 within the nymphal skin, so that they do not invariably 

 lie perfectly still close to the body the whole time. 



