These are images of a Green Blow Fly
, that is most likely a male Lucilia cuprina
Determining the sex in this genus can be done with a good shot of the face, showing the inner eye-lines, bordering the eye gap or frons.
♀ - On the females, the inner eye-lines have a distinct, widened "L" shaped angle, kinked near the antennae base.
Also, the frons is always wider than those of the males of that same species.
♂ - The males have a smoothly curved arc or "C" shaped inner eye-line, from the top of the head, all the way to the bottom of the eyes.
Some species of males have a very tiny eye gap at the top of the head. In the case of this male here in this series; this species has the males with the widest frons of all of the species in the genus.
(Some of these features are very hard to see or not visible in most images.)
Keying to Family of Caliptratae: (Whitworth 2006)(1)
1. - Meron with distinct row of setea = 2
2. - Subscutellum absent or weak; setose arista = 3
3. - Abdomen and thorax, shining metalic blue, green, or bronze luster = most of Family Calliphoridae
Keying to Subfamily and Genera of family Calliphoridae: (Blow-flies)
1. - Basal section of stem vein bare above = 9
9. - Middle of proepisternal depression setose; body shining metalic blue green, or bronze, sheen sometimes dulled by microtomentum = 13
13. - Thorax and abdomen shining green, blue or bronze; suprasquamal ridge with conspicuous cluster of setae near the base of scutellum; lower calypter bare above = Subfamily Luciliinae
, containing the single Genus Lucilia
Keying to Species of Genus Lucilia:
1. - Subcostal sclerite on venter of wing with pubescence only; basicosta orange or black; palp orange or black = 2
2. - Palp orange to yellow, not darkened apically; length of head at level of lunule less than half head height (some exceptions); third abdominal tergite with marginal setae not especially strong or erect (some exceptions); basicosta usually yellow, orange, or brown = 5
5. - Three postsutural acrostichal setae; abdomen with apparent mesal division in which one half is microtomentose, the other half is shining (one exception, L. thatuna
) = 9
9. - First flagellomere narrower than width of parafacial at level of lunule, usually not cupped or with reddish margin; frons of male, at narrowest, with frontal plates widely separated, frons 0.12-0.21 head width; frons of female, at narrowest, 0.35-0.40 head width = 10
10. - Central occipital area with single setae below inner vertical setae; metasternum bare; abdomen dull coppery; humeral callus with 2 or 3 small setulae along posterior margin; notopleuron with only 2 or 3 small setulae on posterior border; frons of male broader, at narrowest obviously much broader than width of parafacial at level of lunule, 0.20/7 of head width; frons of female at narrowest 0.39/5 head width; Southern and Southwestern distribution = Species cuprina Wiedemann 1826