Butterflies of the
Amazon and Andes
Family - HESPERIIDAE
subfamily - PYRGINAE
Tribe - ERYNNINI
Anastrus neaeris, male, Manu Biosphere Reserve, Peru
© Adrian Hoskins
Pyrginae, popularly known as Flats or Spreadwings, are a
cosmopolitan subfamily distributed across temperate and tropical
habitats throughout the world. In the Americas there are 990
Butterflies in the genus
Anastrus are commonly known as Duskywings. They average about
5cms in wingspan. They typically have dark velvety wings with a
bluish sheen, convex wing margins, and short antennae.
occurs from Panama to the southern Amazon.
This is a lowland rainforest species, found at altitudes between sea
level and about 900m.
stages appear to be unrecorded. It is likely however that the
lifecycle is similar to that of Achlyodes,
as described below :
The eggs of Achlyodes,
Anastrus and related genera are usually
laid singly on the upperside of leaves of the foodplant.
caterpillar is likely to be smooth-skinned, green or olive-brown in
colour, and marked along the back and sides with a series of thin
longitudinal stripes. It is likely to be a nocturnal feeder, and to
spend daylight hours at rest within a tent made of leaves spun
together with silk.
Males are usually seen singly, when
imbibing moisture from damp sand, muddy paths, peccary wallows, dry
river beds and similar habitats. They are often found amongst mixed
aggregations of Achlyodes,
Antigonus and other Pyrgines.
sexes can also occasionally be seen basking on the foliage of bushes
and shrubs in forest edge habitats, or can be disturbed from their
resting places beneath leaves.