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Narrow-collared Snail-eating Beetle (Scaphinotus angusticollis)

Detailing the physical features, habits, territorial reach and other identifying qualities of the Narrow-collared Snail-eating Beetle

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Image Credit: Meridith G. from WA
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Blushes of red on the abdomen of this black Ground Beetle range from bright apple to a blush of auburn.

Updated: 07/07/2021; Authored By Staff Writer; Content ©www.InsectIdentification.org
Scaphinotus angusticollis is a Ground Beetle found in states and provinces west of the Cascade Mountain Range. It is black though many individuals have shades of red on the almond-shaped abdomen. The abdomen has a matte luster, but can appear very glossy when wet. An outer ridge along the abdomen is almost bumpy, creating a definitive edge around this part of the body. The pronotum is shaped like a crown or heart. The long head, mouth parts, and legs are black. Long legs give the body of the beetle some distance from the ground below it. They cannot fly.

The larvae of this beetle feed on snails they come across. Adult beetles feast on snails, slugs, and other creatures found on the ground, but they enjoy fruits like berries as well. The narrow head and extended mouth parts allow the beetle to reach farther into a snail's shell so it can consume the entire soft body. Look for adults under logs during the daytime in areas loaded with snails. A Narrow-collared Snail-eating Beetle might come to a fruit lure, allowing for closer observation.

General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
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Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Coleoptera
        Family: Carabidae
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          Genus: Scaphinotus
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            Species: angusticollis
Identifying Information
Size, Colors, Features
Scientific Name: Scaphinotus angusticollis
Category: Beetle
Size (Adult; Length): 16mm to 24mm (0.62" to 0.94")
Colorwheel Graphic Colors: black, red, green
Descriptors: auburn, burgundy back, ridges, heart-shaped neck, two-toned, glossy

Relative Size Comparison
Typical Size Between 16mm (0.6in) and 24mm (0.9in)
Lo: 16mm
Md: 20mm
Hi: 24mm
Territorial Map*
U.S., Canada, and Mexico
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Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Narrow-collared Snail-eating Beetle 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 Narrow-collared Snail-eating Beetle. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.


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