Boreus brumalis

Fitch, 1847

mid-winter boreus, snow scorpionfly

Boreus brumalis, commonly known as the mid-winter boreus or snow scorpionfly, is a small, wingless insect in the Boreidae. Despite its , it is neither a nor a fly, but belongs to the order Mecoptera. are active during winter months and can be observed running across snow and ice. This is found in North America, including the northeastern United States. Males possess distinctive upward-curving genitalia that resemble a scorpion's stinger, though the insect cannot sting. Snow scorpionflies are believed to be ancient relatives of fleas.

Boreus brumalis 245455545 by Will Kuhn. Used under a CC BY 4.0 license.Boreus brumalis USA by Will Kuhn. Used under a CC BY 4.0 license.Boreus brumalis Canada by Ben Armstrong. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Boreus brumalis: //ˈbɔːriəs bruːˈmɑːlɪs//

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Identification

Boreus brumalis is a tiny insect, typically 5 mm or less in length. lack functional wings and cannot fly—a key distinction from other Mecoptera. Males possess large, upward-curving genitalia that superficially resemble a 's stinger; females lack this structure. The body is slender with an elongated rostrum (snout). Coloration is generally dark. The wingless condition distinguishes Boreidae from winged scorpionflies in such as Panorpidae.

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Habitat

Found in moist, lowland forests near streams. occur on snow, ice, and on mosses and liverworts, which serve as food sources.

Distribution

North America; recorded from the northeastern United States including Vermont and Maryland.

Seasonality

Active during winter months, from December through February. can be observed on cold, sunny days even when temperatures are below freezing.

Diet

and larvae feed on mosses and liverworts.

Behavior

disperse between breeding areas by running across open snow. Males engage in a distinctive mating ritual: they grasp the female and place her on their back for a ride, possibly to limit access by rival males. Adults are capable of hopping.

Human Relevance

Of minimal direct human relevance. Occasionally encountered by naturalists and entomologists during winter field work. Requires magnification to observe due to small size.

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