Lynn Scott's  
Lepidoptera
Index
06662 Paleacrita vernata 39 06662 Paleacrita vernata 20
06662 Paleacrita vernata 36 06662 Paleacrita vernata 13
Geometridae
Ennominae
Bistonini

6662

Paleacrita vernata

Ottawa (Dunrobin), ON Canada

20 April 2007   11:52PM EDT  (top left)
13 April 2005   12:08AM EDT  (top right)
14 April 2007   9:52PM EDT  (bottom left)
1 April 2005   9:53PM EDT  (bottom right)

My initial identifications of Palceacrita vernata, also known as the Spring Cankerworm Moth, were based on Covell (1984) and Handfield (1999).  Some information on the species has also been obtained from McGuffin, W.C., "Guide to the Geometridae of Canada (Lepidoptera), II.  Subfamily Ennominae.  2", Memoirs of the Entomological Society of Canada, no. 101 (Ottawa: 1977).

The forewing of the male Paleacrita vernata is smoky bluish gray, with faint brownish shades.  Antemedial, medial and postmedial lines are dark gray, generally visible at the costa and inner margin, but otherwise frequently obscure.  There is a pale gray patch at the apex, defined by the beginning of the postmedial line at the inner edge, and by a line angling inwards from the apex.  A whitish zigzag subterminal line, narrowly shaded with gray on the inside, and followed by a broader gray-brown shade on the outside, carries on across the wing from the corner of the pale apical patch.  The vein running through the middle of the wing is usually highlighted with black where crossed by the antemedial, medial and postmedial lines; it is sometimes partially traced in white in the median.  The hindwing is pale gray and virtually unmarked.  At rest, Paleacrita vernata usually overlaps its wings as in the two photos at top, creating a narrower silhouette than is usual with most geometrid moths.  McGuffin (1977) notes a wing expanse of 20 to 35 mm.

The female Paleacrita vernata is flightless, with virtually non-existent vestigial wings.

According to Handfield (1999), the larva of Paleacrita vernata has been reported to feed on maple, elm, birch, cherry and a variety of other trees and shrubs. For my general area, he indicates the adult moth flies from late March to about mid-May.

My records to date for Palceacrita vernata (each date representing "the night of") are in the table below:

Month 0102030405060708091011 121314151617181920 2122232425262728293031
March 29
April 0103050607080911 1213141617181920 2123
May 01
June
July
August
September
October
November
December

Page last modified 11 August 2007
Copyright © 2001-2011 D. Lynn Scott