round-necked longhorn beetle

(Clytus ruricola)

Conservation Status
round-necked longhorn beetle
  IUCN Red List

not listed


NNR - Unranked


not listed


Round-necked longhorn beetle is a common, medium-sized, wood boring beetle. It occurs in the United States from Maine to northern South Carolina, west to Minnesota, Illinois, and Georgia. It also occurs in southern Canada from Nova Scotia west to Alberta. Adults are found from May to early August in deciduous forests. They feed on the pollen of many flowers in numerous plant families. The larvae feed on the rotting wood of hardwoods, especially maple.

Adults are to (10 to 15 mm) in length. They are black with bright yellow markings. When in flight they resemble a yellowjacket or paper wasp. This is an example of Batesian mimicry, mimicking the defensive coloration of a defended species. The body is elongated, rather robust, and somewhat cylindrical. It is constricted between the thorax and the abdomen, forming a distinct rounded “neck”.

The head is large and entirely black. The face is slanted forward or nearly vertical. There is no ridge (carina) on the front of the head. The compound eyes are deeply notched. The small antennae-like structures (palps) emerging from the lower jaws (maxillae) are blunt or straight across at the tip, not pointed. The antennae are slender, thread-like, and long, at least half as long as the body. They are mostly reddish-brown but the last 4 to 5 segments are black.

The exoskeletal plate covering the thorax (pronotum) is black, rounded on the sides, widest near the middle when viewed from above, and strongly convex when viewed from the side. It is densely pitted (punctate), but it does not have a transverse ridge. There is a single, narrow, yellow band on the front and lateral margins that extends only slightly onto the rear margin on each side. The small plate between the wing bases (scutellum) is yellow.

The hardened forewings (elytra) are broad at the base, round at the tips, and black with yellow markings. On each elytron there is an oblique, oval spot in the basal third; a U-shaped band extending from the inner margin (suture), back to the middle, then forward and outward to near the leading edge (costal margin); and an oblique bar beyond the middle.

The legs are long and mostly reddish-brown. The third segment (femur) on each leg is narrow and reddish-brown at the base, swollen (clubbed) and black from the middle to the tip. The last part of each leg (tarsus), corresponding to the foot, has five segments. The first segment is very long. The fourth segment is very short and is concealed within the lobes of the heart-shaped third segment, making the tarsus appear to have only four segments.




Total length: to (10 to 15 mm)


Similar Species






One generation per year: May to early August






Life Cycle




Larva Food


Rotting wood of hardwoods, especially maple


Adult Food


Flower pollen


Distribution Map



7, 24, 27, 29, 30, 82, 83.







Coleoptera (beetles)  


Polyphaga (water, rove, scarab, long-horned, leaf, and snout beetles)  




Chrysomeloidea (longhorn beetles and allies)  


Cerambycidae (longhorn beetles)  


Cerambycinae (typical longhorn beetles)  







Clytanthus ruricola


Common Names


field long-horned beetle

round-necked longhorn beetle











Costal margin

The leading edge of the forewing of insects.



The hardened or leathery forewings of beetles used to protect the fragile hindwings, which are used for flying. Singular: elytron.



On insects and arachnids, the third, largest, most robust segment of the leg, coming immediately before the tibia. On humans, the thigh bone.



Paired mouth structures of arthropods located immediately behind the mandible and used for tasting and manipulating food. “Under-jaws”.



Short for pedipalp. A segmented, finger-like process of an arthropod; one is attached to each maxilla and two are attached to the labium. They function as sense organs in spiders and insects, and as weapons in scorpions. Plural: palpi or palps.



The exoskeletal plate on the upper side of the first segment of the thorax of an insect.



Dotted with pits (punctures), translucent sunken glands, or colored spots of pigment.



The exoskeletal plate covering the rearward (posterior) part of the middle segment of the thorax in some insects. In Coleoptera, Hemiptera, and Homoptera, the dorsal, often triangular plate behind the pronotum and between the bases of the front wings. In Diptera, the exoskeletal plate between the abdomen and the thorax.



On insects, the last two to five subdivisions of the leg, attached to the tibia; the foot. On spiders, the last segment of the leg. Plural: tarsi.





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Greg Watson

    round-necked longhorn beetle      
    round-necked longhorn beetle   round-necked longhorn beetle  
    round-necked longhorn beetle   round-necked longhorn beetle  



Clytus ruricola
Andree Reno Sanborn
  Clytus ruricola  



Visitor Videos

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Other Videos
  Round-necked Longhorn Beetles (Cerambycidae: Clytus ruricola)
Carl Barrentine

Jun 16, 2010

Photographed at the Rydell NWR, Minnesota (16 June 2010).

  LONGHORN BEETLE Clytus ruricola
Rob Curtis

Jul 20, 2019

Clytus ruricola CERAMBYCINAE LONGHORN BEETLE, McClaughery Springs FP, 7/3/2019




Visitor Sightings

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  Greg Watson

Location: Whitewater State Park, along the Trout Run Creek Trail

round-necked longhorn beetle  




Created: 7/1/2023

Last Updated:

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