New synonyms and stage description for three species of Leptohyphidae (Ephemeroptera)

Vacupernius paraguttatus (Allen) and Allenhyphes michaeli (Allen) are new junior subjective synonyms of V packeri (Allen) and A. vescus (Allen), respectively. Larval characters such as abdominal maculation are shown to be Variable and unreliable in separating these species. Maxillary palp segmentation is difficult to detect among immature larvae of both species and must be used With caution When identifying immature leptohyphid larvae to species. The adult stage of Homoleptohyphes miris (Allen) is described for the first time based upon reared and field-associated specimens from southern Arizona.