|scientific name Macaria bitactata |
common name Short-lined Granite
Moist open woods and shrubby areas.
Flies in July and August, peaking in mid July.
A grey geometrid with bold, black transverse lines on the forewing; the four dark costal wedges typical of the genus continue as AM, PM and median lines, the median line broadest and incorporating the discal spot. AM and PM line sometimes broken. Hindwing slightly paler, speckled grey with a faint (sometimes absent) PM line and discal spot, slightly darker marginal area. Sexes not dimorphic.
Similar to M. decorata, which has a speckled, not uniform grey, forewing ground colour, and lacks the thickened median line. Members of the genus Digrammia have a dark patch midway down the forewing submarginal area, absent in M. bitactata.
The immature stages are detailed by McGuffin (1972). Adults come to light.
No obvious concerns.
Larvae feed on alder (Alnus sp.) and gooseberry (Ribes sp.) (Prentice 1963).
Newfoundland west to the Yukon and B.C., south to California (McGuffin 1972).
Comments are published according to our submission guidelines. The EH Strickland Entomological Museum does not necessarily endorse the views expressed.