THE NIGRESCENS SPECIES GROUP (NEW GROUP)

DIAGNOSIS: Small to medium-sized flies; thorax dark blackish brown, with typical white markings; femora light brown (except some Arizona individuals of A. nigrescens), tibiae and tarsi yellow; aristal branch lengths short to very short, branches confined to basal half; frons dark, dull. Male genitalia: Relatively simple; surstylus slen-der, armlike, with few prensisetae; outer paraphyses with one or no spines, asymmetrical in size; inner paraphyses lost.

NEARCTIC SPECIES: Amiota fulvitibia, A. nanonigrescens, sp. nov., and A. nigrescens Wheeler.

COMMENTS: It is unknown whether any of the species in this group exhibit the common behavior among Amiota of being attracted to humans. All taxa seem commonly caught in Malaise, pan, and emergence traps.