The morphology and chaetotaxy of the first instar larva of Lutzomyia
(Lutzomyia) longipalpis are described based on observations made under
scanning electron microscope. Because three-dimensional images were
studied, some terminological changes are proposed to give a more realistic
description of the positions of the setae. On the larval body, the pairs of
setae have the following number: 9 on the head, 12 on the prothorax, 8 on
the meso- and metathorax, 6 on the first to eighth abdominal segments, and
8 on the ninth abdominal segment.