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Key to the species of Zonosemata

The following key is copied from Norrbom (2002).

1. Wing bands extremely narrow; width of discal, subapical and apical bands less than length of crossvein R-M. Most of radial cells and cell dm between discal and subapical bands without microtrichia. Scutum without presutural dark brown mark. Mexico, Guatemala, Honduras. . . . . . . . . . . vidrapennis Bush

Wing of Zonosemata vidrapennis.

- Wing bands relatively broad; width of discal and subapical bands equal to or greater than length of R-M. Radial cells and cell dm at most with small areas bare of microtrichia between these bands, or if with large bare areas (Z. vittigera, Z. macgregori), scutum with large presutural, sublateral dark brown mark. . . . . . . . . . 2

Wings of Zonosemata minuta and Z. vittigera.

2. Apical band extended basad along vein M, together with subapical band forming P-shaped mark (Fig. 1A). Mexico (Morelos, Guerrero, Chiapas). . . . . . . . . . . cocoyoc Bush

Wing of Zonosemata cocoyoc.

- Apical band not extended along vein M. . . . . . . . . . . . . . 3

3. Distal 3 abdominal tergites (3-5 in male, 4-6 in female) with dark brown lateral spots, those on last 2 tergites large. Jamaica. . . . . . . . . . . minuta Bush

Dorsal habitus of Zonosemata minuta male.

- Dark brown lateral spots present at most on distal 2 tergites, that on penultimate tergite small if present. . . . . . . . . . . 4

Dorsal habitus of Zonosemata vittigera and Z. guybushi females.

4. Apical band, subapical band anterior to vein R4+5, and accessory costal band faint, much paler than discal band and posterior part of subapical band. Accessory costal band often connected to subapical band. Length of first flagellomere of antenna (measured on mesal side) more than 0.7 times height of face (measured to ventral margin of antennal sockets). Colombia, Venezuela, northeastern Brazil. . . . . . . . . . . scutellata (Hendel)

Wing of Zonosemata scutellata.

- Apical and subapical bands evenly developed, similar to discal band in color. Accessory costal band variable, but not connected to subapical band. Length of first flagellomere less than 0.7 times height of face. . . . . . . . . . . 5

Wings of Zonosemata guybushi and Z. vittigera.

5. Scutum without presutural dark brown marks. Cells r4+5 and dm mostly or entirely microtrichose between discal and subapical bands. Katepisternum rarely with dark brown spot. . . . . . . . . . . 6

Dorsal habitus of Zonosemata guybushi female.

- Scutum with presutural dark brown marks. Cells r4+5 and dm with large bare areas without microtrichia between discal and subapical bands. Katepisternum with dark brown spot. . . . . . . . . . . 7

Dorsal habitus of Zonosemata vittigera and Z. macgregori females.

6. Discal band (measured along vein M) usually narrower than hyaline area distal to it, at most 1.1 times as broad. Discal, subapical and apical bands orange brown. Subscutellum and mediotergite usually orange. Southeastern Canada, eastern U.S.A. . . . . . . . . . . electa (Say)

Wings of Zonosemata electa.

- Discal band (measured along vein M) 1.21-1.34 times broader than hyaline area distal to it (Fig. 1D). Discal, subapical and apical bands brown. Subscutellum and most of mediotergite dark brown. Costa Rica. . . . . . . . . . . guybushi Norrbom

Wing of Zonosemata guybushi.

7. Wing bands relatively narrow, cell r2+3 apical to subapical band with large hyaline mark along vein R4+5, at least 1/3 width of cell. Vertex usually entirely yellow except for brown ocellar tubercle. Scutum with submedial stripe usually orange anterior to transverse suture, occasionally partially to entirely red-brown or dark brown. Accessory costal band distinct. Southwestern U.S.A. to central Mexico. . . . . . . . . . . vittigera (Coquillett)

Wing of Zonosemata vittigera.

- Wing bands relatively broad, cell r2+3 apical to subapical band entirely infuscated or with narrow hyaline mark along vein R4+5, at most 1/3 width of cell (Fig. 1E). Orbital plate moderate to dark brown, sometimes connected by a band across vertex. Scutum with submedial stripe usually dark brown anterior to transverse suture. Accessory costal band sometimes faint. Mexico (Baja California, Sonora). . . . . . . . . . . macgregori Hernández-Ortiz

Wing of Zonosemata macgregori.