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Bold-feathered Grass Moth (Herpetogramma pertextalis)

Detailing the physical features, habits, territorial reach and other identifying qualities of the Bold-feathered Grass Moth

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Image Credit: Alex -icycatelf- Bowen
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Brown and purple-hued lines cross wings with a pale fringe on the Bold-feathered Grass Moth.

Updated: 01/26/2021; Authored By Staff Writer; Content ©www.InsectIdentification.org
A series of dashes, scalloped lines, and even small rings cover the white wings of the Bold-feathered Grass Moth. When seen in light, the moth shimmers as if coated with a satiny gloss. The translucence of the wings is best seen when they are spread open flat. A brown line contours the entire bottom edge of all of the wings, which makes the light fringe stand out.

Caterpillars are often referred to as grass or sod webworms. They are commonly seen in lawns and turf where they use their silk to create burrows under the thatch. This species is not known as a pest though. It feed on violets and possibly other low-growing plants in addition to grasses.

General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Flying insect icon
Shiny insect icon
Striped or banded insect icon


Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Lepidoptera
        Family: Crambidae
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          Genus: Herpetogramma
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            Species: pertextalis
Identifying Information
Size, Colors, Features
Scientific Name: Herpetogramma pertextalis
Category: Butterfly or Moth
Size (Adult; Length): 28mm to 33mm (1.10" to 1.29")
Colorwheel Graphic Colors: white, brown, purple
Descriptors: translucent, violet lines, scalloped, broken, curve, flying, glossy, shiny

Relative Size Comparison
Typical Size Between 28mm (1.1in) and 33mm (1.3in)
Lo: 28mm
Md: 30.5mm
Hi: 33mm
Territorial Map*
U.S., Canada, and Mexico
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Bold-feathered Grass Moth may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Bold-feathered Grass Moth. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.


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