Costeno amarillo

Costeno amarillo is a shiny, amber colored chile pepper related to the guajillo. The peppers grown in the Oaxaca and Guerrero region of Mexico have a slightly citrus, crisp flavor and used in moles, soups and stews. The chiles are 2 - 3" long and about 1" wide across the top, tapering down. (Amarillo means "yellow" in Spanish)  The heat is about a 4 on a relative heat scale of 1-10 which is similar to the heat of a guajillo chile.  The costeno rojo is about twice as hot.

Chile plants are available at Cross Country Nurseries. These dried chiles are available at some specialty markets and online at the Spice Trekkers.

A good substitute for costeno amarillo is the Onza Amarillo but probably equally difficult to find. If you're trying to make a yellow salsa then it's probabably best to wait until you can find the proper chiles.