Not new for me, but semi-rare and found only in Central America & Mexico. Red-spotted Scrub-Hairstreak, Strymon ziba (linked to my gallery) is another one of those very tiny, fingernail-sized butterflies and this one I’ve seen only in my garden. You can see a few other photos from other countries on the butterfliesandmoths.org page.
¡Pura Vida!