Oecanthus fultoni
This species is one of three in the US with a musical chirping song rather than trilling.
This male has his wings in preparation to sing, and has exposed his metanotal gland.
This 1st instar nymph already displays the straight rows of abdominal markings, and the regularly spaced black marks on the antennae.
Although there are now more white marks on the abdomen of this 5th instar, the larger white marks are still in straight rows and evenly spaced. We know it is a female because we can see an ovipositor. Her wing sacs are swollen as she prepares for the final molt into being an adult.
In comparison, this is a 5th instar male – note the lack of an ovipositor between the two cerci.
This is an adult male Snowy tree cricket.
Here is an adult female. The orange/red on the head of this species tends to be an isolated patch, whereas the red/orange on Narrow-winged tree cricket tends to run down into the pronotum. There are always the occasional individual that does not fit this rule.
To read the description for this species: https://orthsoc.org/sina/s576lw62.pdf