It appears that my egg case belongs to a Chinese Mantis.
We have seen them here but never an egg case ...just found a second one this morning.
https://en.wikipedia.org/wiki/Chinese_mantis
The Chinese mantis is a long, slender, brown and green praying mantis. It is typically longer than other praying mantis species, reaching just over 11 cm (4.3 in), and is the largest mantis species in North America (spread throughout the Northeast United States). Its color can vary from overall green to brown with a green lateral stripe on the borders of the front wings in the brown color form. In low light, the eyes of the mantis appear black, but in daylight appear to be clear, matching the color of the head. Chinese mantids look similar to another mantis species that has been introduced to the United States
The female can produce several semi-spherical oothecae, roughly 2 cm (0.8 in) in diameter, containing up to 300 eggs.[2] The oothecae are often affixed to vegetation such as bushes and small trees.
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