About Atomotricha isogama Meyrick, 1909
Edward Meyrick first described Atomotricha isogama in 1909. His original morphological description of the species is as follows: Males and females measure 23 mm. The head and thorax are whitish-ochreous, with a more brownish tint in males. Palpi are whitish-ochreous, with a small number of scattered dark-fuscous scales on their outer surface. Antennae are whitish-ochreous, with obscure dark fuscous rings. The abdomen is whitish-ochreous, browner in males, and dorsally suffused with brassy-golden colour except on segment margins. Forewings are elongate, with a moderately arched costa, obtuse apex, and very obliquely rounded termen. They are whitish-ochreous with a few scattered dark-fuscous scales; in males, most of the forewing is suffused with brownish, except for a dorsal streak. A broad pale dorsal streak runs from the base to the tornus, with a prominent upper edge near the base (where a tuft of scales is present) and around the middle of the dorsum. Dark-fuscous suffusion extends above this streak from the base to three-fifths of the disc, then extends upward to the costa. Stigmata are round, whitish-ochreous, edged with dark fuscous; the plical stigma is positioned obliquely beyond the first discal stigma. An angulated dark-fuscous line or series of dots runs from the costa to the tornus. Cilia are ochreous-whitish; in males they are irrorated with grey, and the basal third is barred with fuscous. Hindwings are very pale whitish-ochreous, with a cloudy round fuscous discal spot. The apex and lower half of the termen are suffused with fuscous irroration. Hindwing cilia are ochreous-whitish, with a suffused fuscous shade around the apex and on the lower half of the termen. Females of this species have fully developed wings. As adult moths, the species shows variation in the colour intensity of its forewings, and some specimens are yellow-ochreous. This species is endemic to New Zealand, and has been observed in both the North and South Islands. In terms of life cycle, larvae emerge in New Zealand spring, and reach their full adult size of over 2.5 mm in length by autumn. Adult moths have been recorded in flight from July to January.
