Banded and Hickory Hairstreak Identification (Satyrium calanus/caryaevorum)
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This female Satyrium has markings that are consistent with Hickory Hairstreak (S. caryaevorum). The two bands in the hindwing are nearly in alignment (red arrows), and the band in the forewing is strongly offset (blue arrow). However, the antenna on female Hickory should be yellow/orange ventrally, not black as in female Banded. So, is this a Hickory?

This female Satyrium has the offset in the forewing band like Hickory Hairstreak (blue arrow), and the two bands in the hindwing are strongly misaligned (red arrows),like Banded Hairstreak (S. calanus). The antenna looks typical for female Banded, and I strongly suspect this one is a female Banded Hairstreak
Here is the diagnosis on these two from my Satyrium "expert"
I would ID these hairstreaks as female Hickory on left and female Banded (Hickory type) on right. There are a few more subtle things, besides the common ones cited in fieldguides, that place the female on the left as a Hickory. By the way, the nudum on the ventral side of her antennae looks pale to me (almost orange).
The same person later agreed with the Identification of of the two males below.

This male appears to be classic Hickory Hairstreak
(Satyrium caryaevorum) - 6/14/03.

This male appears to be classic Banded Hairstreak
(Satyrium calanus) - 5/28/03.

Some additional identification comments
These images are all from a small area in Newton County, Arkansas. with lots of Shagbark Hickory (Carya ovata). A few additional identification points are:

(1) the red spot above the large blue spot in the hindwing is smaller in Hickory (male and female), and the black basal area within the spot much bigger, making the red portion smaller.

(2) The antenna on the female Hickory tends to have the underside (nudum) more extensively pale, often completely orange, but this appears to be somewhat variable.

(3) The scent gland on the forewing of the male, is long and narrow on Hickory, and broader on Banded.

(4) Hickory is browner overall, and banded grayer, however some oak-feeding bandeds can be very brown, and appear to be less gray than hickory feeders in general.

(5) Many, but not all Bandeds, show some red in the cap of the blue spot, but usually only a very small amount. However, some oak feeding bandeds can show much more red, but never approaching Kings Hairstreak.

I have never seen one that I identified as Hickory that showed any hint of red in the cap of the blue spot. Many ID points can be variable, and some only call them "tendancies", but if you can put a good combination of these points together I don't hesitate to call it a hickory. The one point that is completely unreliable is the offset in the fore-wing band. I chose the pictures to illustrate this. I caution that all individuals might not be identifiable because of ambiguous characters. Some you just have to walk away from. There are some lepidopterists that will not accept a record of Hickory Hairstreak without a specimen and examination of the genetalia.

images copyright Bob Barber