Catocala subnata / Catocala neogama / Catocala piatrix
Comparison

Some differences (not usually mentioned) that seem to be consistent in the images I have seen include the larger orange marking near the hw apex in C. subnata, where the orange seems to protrude into the black rather than the black protruding into the orange. C. subnata also seem to have a uniformly pale and elongated and open subreniform spot, while that of C. neogama is more rounded and closed with a darker center.

Examination of the tibia may be necessary to confirm identifications.

The bottom image of Catocala piatrix shows a brown head and thorax rather than the grey prevalent in the other two species. The subreniform spot is usually large and open.

C. piatrix is characterized by the pale area located anterior to the subreniform spot and extending to the costa. Overall ground colour of the forewing is more of a uniform grey-brown.

Catocala subnata female, courtesy of Pierre Legault.

Catocala neogama August 9, 2004, St-Anne de Bellevue, Montreal, Quebec,
females, attracted to bait, courtesy of Pierrre Legault.

Catocala neogama August 9, 2004, St-Anne de Bellevue, Montreal, Quebec,
females, attracted to bait, courtesy of Pierrre Legault.

Catocala piatrix, 72mm, Mason, Ingham County, Michigan,
bait, August 14, 1996, courtesy of Harry King.

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