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Body form is elongate, oval and usually smaller than the rest of the genus. Dorsal surface grayish in colour and covered evenly with dark brownish-gray punctures. The apical (end) fifth of the pronotum is a brighter yellow colour with much less puncture marks, usually smooth. The humeral angles of the pronotum are quite broad and rounded with the concavity on the anterior edge pronounced. The apical half of antennal segment four and all of segment five are dark brown to black in colour. Length 10-12 mm and width 7-7.5 mm (Blatchley 1926). This subspecies, as well as E. t. tristigmus, has black spots on the middle of the abdomen (McPherson 1982).

This subspecies has been found on the following host plants; raspberry, sumac, Salix (willow), hazelnut, scrub-oak, meadow-sweet, marsh grasses, wild rose, button-bush, tomatoe, pear, poplar, yellow birch, pine, goldenrod, elder, mullein, alfalfa and hollyhock. It also may feed on the eyespotted bud moth larvae in the lab (McPherson 1982).