|White M Hairstreak (Parrhasius m-album)
Family: Blues, Coppers, Hairstreaks, Elfins (Lycaenidae)
State Rarity Rank:
Global Rarity Rank:
Did you know?
The rarely seen metallic blue color on the dorsal surface of the wings is thought to play a role in sexual selection (Sourakov 2008).
|State Ranking Justification||
Although this species seems to have expanded its range, it nevertheless is always found in very low numbers and has been found at only a few locations confined to extreme southeastern New York. Population abundance is known to vary widely from year to year. Because it appears to be a generalist, occupying heavily urbanized areas and feeding on a variety of common food sources in both the adult and caterpillar stage, threats to the viability of populations are unclear at this time. It is not certain that this species will remain on the active tracking list in the future.
Only two records (Rockland and Richmond Counties) were reported by Shapiro (1974). Glassberg (1993) and Cech and Tudor (2005) felt that the species was expanding its range northward and by the mid 2000s the species was reported as far north as Putnam and Orange Counties (Fiore and Wallstrom 2003-2006). Matteson and Roberts (2010) reported upwards of 30 sightings of this species in the New York City metropolitan area between 2001 and 2009.
This species seems to have expanded its range northward in New York over the past four decades, possibly as a result of a longer flight season due to global warming (Glassberg 1993).