Synonyms and other taxonomic changes
Anthrax caliptera Say 1823
Pattern of "chocolate" infuscation on wings is distinctive in its details and fairly consistent...see wing diagram here
Anterior 3/5's or more of second tergite covered in short silvery-white pubescence, forming a band that's deeply notched or completely interrupted medially...see thumbnails below (and the 2nd sentence of Osten Saken's remarks here
Short white medial streaks on tergites 3 to 6;
White dashes on posterior corners of tergite 3.
From Evenhuis & Greathead(1)
Canada (British Columbia), USA (Arizona, Arkansas, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, South Dakota, Washington), Mexico (Durango).
Say's original 1823 description can be read here
; Osten Saken's 1877 remarks can be read here
is quite close in appearance to E. caliptera
Both have a similar wing pattern, but the bulbous apical portion of the chocolate infuscation spills slighty beyond R2+3 in caliptera
, whereas it is exactly bounded by vein R2+3 in dorcadion
The differences in the patterns of white on the dorsum of the abdomen are often easier to see:
The most consistent distinction is that in dorcadion the white band on the second tergite is narrower (i.e. ≤ 1/2 tergite length) or absent, and is neither notched nor broken medially.
A less consistent difference is that dorcadion
typically has lateral pairs of white dashes
forming longitudinal lines on tergites 3 to 6 which converge distally
, whereas caliptera
typically has single medial streaks on tergites 4 to 6. (See Osten Saken's descriptions of caliptera
.) But individuals of each species can vary towards one another in this last character, as seen below:
calpitera calpitera dorcadion dorcadion dorcadion