Average (± SD) percentage of the long axis of the feather rachis with Proctophyllodes huitzilopochtlii present for each tail feather (rectrices 1–5, right and left sides.

Results are reported for sex of Anna’s Hummingbirds (n = 98 males and 65 females) that had mites present on any rectrix. The percentage scale ranged from 0–100% in 10% increments unless 5 or fewer mites were present (reported as 5%) or a single mite was present (reported as 1%). Not all rectrices had mites present. “LR” denotes “left rectrix” and “RR” denotes “right rectrix.” All mites were observed on the ventral aspect of the feathers.