Comprehensive Description

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General Description

A medium-sized (3.1-3.5 cm wingspan) dark brown moth. The forewings are dark brown or dark grey-brown with a black basal dash and a contrasting pale cubital vein. Most likely to be mistaken for specimens of E. ridingsiana or some forms of E. tessellata. Divergens lacks the pale streak distal to the claviform spot and the streaking in the subterminal area found in ridingsiana. Males can also be distinguished by the long saccular extensions (longer than the harpes in divergens, half as long as the harpes in ridingsisana). Females of the two species can be separated by the absence in divergens of the sclerotized flanges on the ovipositor lobes found in ridingsiana. Males of divergens can be separated from those of tessellata by the absence of the yellow scale tufts at the forewing base found in tessellata, as well as by the more cylindrical saccular extensions and the less apically expanded cucullus in divergens. The ovipositor lobes of divergens are rounded and covered in fine setae; those of tessellata are truncate and covered in short, conical setae.  Specimens of divergens can be quite variable in both ground color (almost black to light grey-brown) and extent of white scaling along the cubital veins (well-marked to reduced to a few light scales). Divergens belongs in the subgenus Longivesica, characterized by the extremely long vesica in males and the appendix bursa being longer than the corpus bursa in females. Lafontaine (1987) provides keys to the subgenera and species and illustrates adults and the genitalia of both sexes. 


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© University of Alberta Museums

Source: University of Alberta Museums

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