two-horned treehopper

not listed

not listed

not listed

Two-horned treehopper is a buffalo treehopper. It is a small jumping insect, a medium-sized treehopper. It occurs in the northern half of the eastern United States and in adjacent Canadian provinces. It is common in the northeast but uncommon in Minnesota, where it is at the western extent of its range. Its primary host is American elderberry but it has been found on many other plants.

Adults are small, 5⁄16″ to ⅜″ (8 to 9 mm) in length. The body is dark brown. When viewed from the side it is broadly rounded and high. When viewed from above it is triangular.

The exoskeletal plate covering the thorax (pronotum) is light brown or yellowish-brown and is densely covered with erect hairs. It is very long, extending back over the abdomen and completely concealing the triangular plate between the wing bases (scutellum). It is moderately arched, highest just before the middle. The forward corners (humeral angles) of the pronotum are extended sharply outward and upward into stout points (suprahumeral horns), suggesting the horns of a buffalo. The area in front of the horns (metopidium) is vertical and flat. There is a sharp, longitudinal ridge (carina) that extends over more than half of the pronotum, merging with a raised triangular area between the horns. There is a dark spot on each side of the pronotum below the horn, and another dark spot above near the rear.

The wings are held roof-like over the body when at rest. The first radial vein (R₁) is short and is close to the start of the second radial vein (R_2+3+4+5).

Total length: 5⁄16″ to ⅜″ (8 to 9 mm)

Early August to late September (CCESR)

Mostly American elderberry but possibly many other plants

Mostly American elderberry but possibly many other plants

Sources

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

Uncommon in Minnesota

This species was formerly classified as Ceresa diceros. A revision of the tribe Ceresini moved many Ceresa species into other new or existing genera.