Ortalis sororcula

Korneyev, Severyn V., Hauser, Martin, Kameneva, Elena P. & Gaimari, Stephen D., 2022, A key to species of the Euxesta sororcula species group (Diptera: Ulidiidae: Lipsanini), with new synonymy and a new record from the U. S. A., The Pan-Pacific Entomologist 98 (2), pp. 150-162 : 159-160

Key to species of the E. sororcula species group:

1. Wing with four complete crossbands, of which the 2nd (discal) and 3rd (subapical) crossbands are conspicuously widened posteriorly........................ 2

– Wing pattern different; if with 4 brown crossbands, then 2nd and 3rd with subparallel margins, or the 3rd one narrow, or wing pattern not crossbanded.................................................................. other Euxesta

2. Wing: preapical crossband only slightly widened posteriorly, its posterior margin 1. 5–2. 5× as wide as anterior part in cell r1 ( Figs. 1a–c )................... 3

– Wing: preapical crossband strongly widened posteriorly, its posterior margin 3. 5–6. 0× as wide as anterior part in cell r1 ( Figs 1d–e )..................... 5

3. Wing: subapical and apical crossband not connected at anterior margin ( Fig. 1a ). Legs yellow............................................ E. latifasciata

– Wing: subapical and apical crossband at least narrowly connected at anterior margin ( Figs 1b–c ). Femora and tarsi mostly black.......................... 4

4. Wing with proximal margin of apical crossband clearly oblique, ending in apical part of cell m 1; preapical hyaline interspace strongly widened posteriorly ( Fig. 1b ).......................................... E. leucomelas

– Wing with proximal margin of apical crossband concave and curved proximally posteriorly, ending at middle of cell m 1, preapical hyaline interspace lenticular ( Fig. 1c )......................................................... 6

5. Wing with subapical crossband narrow, 0. 6–0. 9× as wide as preapical hyaline interspace measured along vein R 4+5; subapical crossband strongly narrowed to anterior margin, 0. 5–0. 7× as wide as preapical hyaline interspace measured along vein R 2+3 ( Fig. 1e )......................................... E. sororcula

– Wing with subapical crossband wider, 1. 3–1. 9× as wide as preapical hyaline interspace measured along vein R 4+5; subapical crossband moderately narrowed to anterior margin, 1. 0–1. 5× as wide as preapical hyaline interspace measured along vein R 2+3 ( Fig. 1f )......................... E. obliquestriata (= E. mazorca )

6. Abdominal syntergite 1+2 dirty yellow to brownish-yellow medially................................................................ E. abdominalis

– Abdominal syntergite 1+2 entirely black...................... E. wettsteini

Figures

Figure 1. Wings: (a) Euxesta latifasciata; (b) E. leucomelas (=E. fascipennis); (c) E. wettsteini; (d) E. abdominalis, syntype, MCZ; (e) E. sororcula, type, NHMD; (f) E. obliquestriata, syntype, NHMW. (a–b modified from Wulp (1899); and d modified from EOL site https://eol. org/pages/734579/media). Abbreviations: SA = subapical band; A = apical band; phi – preapical hyaline interspace. Fine black lines show the ratio of SA and phi along vein R4+5 and light blue arrows indicate other characters mentioned in the key.