phrase1: 2nd segment
phrase2: last half of the show
sentence1: The 
  antennae are sub-filiform; the last five segments are almost globular, the 2nd segment is thickened and is distinctly larger than the 3rd segment.
sentence2: The 
  antennae are sub-filiform; the last five segments are almost globular, the last half of the show is thickened and is distinctly larger than the 3rd segment.