Sarginae, Walker, 1834

Lessard, Bryan D., Yeates, David K. & Woodley, Norman E., 2020, Review of Australian Sarginae Soldier Fly Genera (Diptera: Stratiomyidae), with First Records of Cephalochrysa, Formosargus and Microchrysa, Records of the Australian Museum 72 (2), pp. 23-43 : 26-27

Key to Australian Sarginae genera

1 Wings with R 2+3 arising proximal to or above r-m; membranous strap-like lobe absent at base of wings; yellowish brown flies, usually not metallic ................................................................................................................... 2

—— Wings with R 2+3 arising distal to r-m, usually beyond discal cell; membranous strap-like lobe present at base of wings; metallic flies .............................................................................................................................. 3

2 Frons wide and almost parallel in females; face slightly anteroventrally produced to form a small beak-like protuberance visible in profile view; scutum with a distinct black medial vitta; wings with vein M weak and nearly unpigmented between cells br and bm, M 1 and M 3 very weakly developed, M 4 connected to discal cell (i.e. dM 3+4 absent); alula reduced, almost linear ( Fig. 4 ) ..................................................................................... Formosargus James, 1939

—— Upper frons converging ventrally in females; face evenly rounded in profile view; scutum concolorous yellowish brown ( Figs 9 , 10 ) or dully metallic ( P. longipes ; Figs 7 , 8 ), without any distinct markings; wings with vein M noticeably pigmented between cells br and bm, M 1 and M 3 well developed, M 4 separated from discal cell at least slightly by dM 3+4; alula large and apically expanded ............................................................................... Ptecticus Loew, 1855

3 Head anteriorly produced in dorsal view, more circular and less than 1.5 times as wide as high in frontal view; occiput narrowly visible in dorsal view, with a prominent, posteriorly projecting fringe of hair-like setae; frons extremely narrow in females (index> 4), narrowly dichoptic in males by width of anterior ocellus; frontal ocellus distant from posterior ocelli, forming an elongated triangle; wings with all medial veins strong; CuA strongly curved, petiole vein CuA+CuP relatively long; apical half of alula set with microtrichia; abdomen slender elongate, about twice as long as wide ( Figs 11–15 ) .............................................. Sargus Fabricius, 1798 —— Head anteroventrally compressed in dorsal view, more than twice as wide as high in frontal view; occiput well developed and visible in dorsal view in females, both sexes without an obvious posteriorly projecting fringe of hair-like setae; frons wide in females (index <2), holoptic in males; ocelli forming an equilateral triangle; wings with at least some faint medial veins; CuA relatively straight, petiole vein CuA+CuP short; surface of alula bare of microtrichia; abdomen short, broad and ovoid, about 1.2–1.4 times as long as wide .......................................................................................... 4

4 Small species (length <6 mm); head more rounded in anterior view, about 0.75 times as high as wide; lower frons without distinct triangular callus; wing cell r 1 stained yellow; all medial veins faint ( Figs 5 , 6 ) ........................................................................... Microchrysa Loew, 1855

—— Medium sized species (length ≥ 6 mm); head dorsoventrally compressed in anterior view, about 0.6 times as high as wide; lower frons with a distinct triangular callus diverging ventrally towards base of antennae; wing cell r 1 stained brown; veins M 2 and M 4 strong ( Fig. 3 ) ................................................................... Cephalochrysa Kertész, 1912

Figures

Figure 3. Cephalochrysa gselli (Hill, 1919) comb. nov., holotype ♀ (SAMA 29-003393): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 4. Formosargus melanogrammus Lessard & Woodley, sp. nov. holotype ♀ (AMS K.478681): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 5. Microchrysa wrightae Lessard & Woodley, sp. nov. holotype ♂ (ANIC 29-037422): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral;paratype ♂ (ANIC 29-037462):(e) genital capsule and phallic complex, dorsal;(f) genital capsule and phallic complex, ventral, and; (g) epandrium, proctiger and cerci, dorsal. Abbreviations: c, cercus; ep, epandrium; gc, gonocoxite; gs, gonostylus; pr, proctiger.

Figure 6. Microchrysa wrightae Lessard & Woodley, sp. nov. paratype ♀ (ANIC 29-037423): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 7. Ptecticus longipes (Walker, 1861) ♂ (AMS K.453307): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 8. Ptecticus longipes (Walker, 1861) ♀ (AMS K.453309): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 9. Ptecticus queenslandicus Daniels, 1979 holotype ♂ (= rogans Walker, 1858: syn. Rozkošný & de Jong 2003) (AMS K.70681): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 10. Ptecticus queenslandicus Daniels, 1979 paratype ♀ (= rogans Walker,1858:syn. Rozkošný & deJong 2003) (AMS K.364669): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 11. Sargus mactans Walker, 1859 holotype ♂ (BMNH: NHMUK010922300): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 12. Sargus meridionalis White, 1916 holotype ♂ (BMNH: NHMUK010922301): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 13. Sargus meridionalis White, 1916 non-type ♂ (ANIC 29-037454):(a) dorsum;(b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 14. Sargus meridionalis White,1916 non-type ♀ (ANIC 29-037455):(a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.

Figure 15. Sargus darius Hardy, 1932 paratype ♀ (QM T246603): (a) dorsum; (b) lateral; (c) head, frontal; (d) head, anterolateral.