Which preposition to use with glowworm

by Occurrences 1%

Nor yet when even-tide was ended Began to feel, as well he might, The keen demands of appetite: When, looking eagerly around, He spied, far off upon the ground, A something shining in the dark, And knew the glowworm by his spark: So stooping down from hawthorn top, He thought to put him in his crop.

Which preposition to use with  glowworm