Phasia, Latreille (Wood, 1987

Sun, Xuekui & Marshall, Stephen A., 2003, Systematics of Phasia Latreille (Diptera: Tachinidae), Zootaxa 276 (1), pp. 1-320 : 21-22

Key to the world species­groups of Phasia

1. Dorsal facets of eye same size as ventral facets.............................................................. Phasia varicolor species­group (Oriental, Australasian, Afrotropical and Neotropical)

­ Dorsal facets of eye larger than ventral facets ............................................................. 2

2. Fronto­orbital plate bare laterally (as in Figs. I­5.2, I­13.2) ........................................ 3

­ Fronto­orbital plate haired laterally (as in Figs. I­1.2, I­2.2) ....................................... 4

3. Lower margin of face enormously prominent, face deeply concave in profile (as in Figs. I­13.1, I­15.5); sublunular bulla always well developed; subscutellum extending well beyond the scutellar apex (as in Fig. I­31.4); male sometimes with scale­like setae on wing base and femur .. Phasia argentifrons species­group (Southern Hemisphere)

­ Lower margin of face weakly to moderately prominent (as in Figs. I­23.1, I­33.1); sublunular bulla usually not developed; subscutellum evenly rounded, not extended beyond the scutellar apex; male without scale­like setae ............................................... ........ Phasia pusilla species­group (worldwide except Australasian and Afrotropical)

4. Frons swollen (as in Figs. I­10.1, I­11.1­2); lower margin of face perpendicular, or only slightly projecting........................................................................................... ................................ Phasia barbifrons species­group (Palaearctic, Oriental, Mexico)

­ Frons not swollen; lower margin of face well projecting ............................................. 5

5. Fronto­orbital plate densely haired, haired area sometimes reaching eye or nearly so (as in Figs. I­1.1­2., I­26.1­2.) ........................................................................................ .................................. Phasia hemiptera species­group (worldwide except Australia)

­ Fronto­orbital plate with only a few rows of hairs, usually less than 3­4; never reaching eye (as in Figs. I­3.2, I­58.2)... Phasia subcoleoptrata species­group (worldwide)