This usually occurred at dawn and/or dusk when chemical concentrations changed rapidly and drastically.
Four to five hours before dusk, females were introduced into the arenas that were covered with net fabric and transparent plastic covers.
These services displayed salient features of the papal vigils - the participation of the bishop, the omission of the invitatory, and their beginning at dusk.
Trapping sessions comprised a minimum of 4 days, with traps being inspected in the early morning and just before dusk.
At dusk a mob formed and was marching on the capitol and adjacent presidential palace.
The rear held on till dusk before it was completely routed.
Observations were made at midday (with recording commencing 15 min before) and at dusk for both species.
The opposing sides lost sight of one another at dusk.
