\line{
  \hfil
  \picture{img/2019-12-02-2.jpg}{A photo of a relatively large trial showing the constancy of trails and establishment of one pit in a 16x17 container}{4in}
  \hfil
  \picture{img/2019-11-21-4.jpg}{7 well-established pits in the 17x16 trial}{4in}
  \hfil
}