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Giant Black Water Beetle

Hydrophilus Triangularis


A large black beetle. Arched back.


Found in an open conifer forest.


We were eating dinner on an outside deck when this insect landed on the table. then fell to the floor. It was near dusk.

2 Species ID Suggestions

Giant black water beetle
Hydrophilus triangularis giant water scavenger beetle
Water scavenger beetle
Hydrophilidae Hydrophilidae - Wikipedia

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Võ Anh Tuấn
Võ Anh Tuấn a month ago

No problem. :-)

tomk3886 a month ago

Thank you Vo Anh Tuan. It never occurred to me that it was a water beetle. As I have never seen anything like it in the water and being we were in such a dry environment. But on further reflection there is a section of the creek where it spreads out into a marshy area. This area is about a 5 minute walk from where we were.

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Parshall, Colorado, United States

Spotted on Jul 17, 2021
Submitted on Aug 28, 2021

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