FIGURE 1. Habitus of Dixa intacta, holotype. Scale bar equals 3 mm.
FIGURE 2. Morphological features of Dixa intacta. 1, Antennae with individual flagellomeres delineated; 2, Dorsal aspect of the thorax. Scale bars equal 0.5 mm for both figures.
FIGURE 3. Line drawings of wings. 1, Dixella intacta; 2, D. eomarginata; 3, D. curvistyla. Wing venation is from McAlpine (1981). Scale bar equals 1 mm.
FIGURE 4. Tarsal claw teeth of the Kishenehn Dixella. 1, Dixella intacta left metatarsal claw; 2, D. curvistyla left metatarsal claw; 3, D. spinilobata right metatarsal claw. Arrows point to teeth. Scale bars equals 50 μm.
FIGURE 5. The terminalia of Dixa intacta. 1, Posterior portion of abdomen including the spermatheca; 2, Cerci. Scale bars equal 0.5 mm (1) and 0.05 mm (2).
FIGURE 6. Habitus of Dixella eomarginata, holotype. Scale bar equals 3 mm.
FIGURE 7. Morphological features of Dixa eomarginata. 1, Wing with an emarginate posterior margin (arrowhead); arrows denote an apparent false vein posterior to vein M. 2, Terminalia. Scale bars equal 1.0 mm (1) and 0.25 mm (2).
FIGURE 8. Habitus of Dixella curvistyla, holotype. Scale bar equals 3 mm.
FIGURE 9. Morphological features of Dixella curvistyla. 1, Head and antennae; 2, Terminalia. The arrow points to the apical lobe of the gonocoxite. Scale bars equal 0.5 mm (1) and 0.2 mm (2).
FIGURE 10. Habitus of Dixella spinilobata, holotype. Scale bar equals 3 mm.
FIGURE 11. Morphological features of Dixella spinilobata. 1, Photograph of the terminalia; spiniform apical lobe marked with an arrow; 2, Line drawing of a partial reconstruction of the right portion of the terminalia (dorsal view). Scale bar equals 0.25 mm.
FIGURE 12. Intraspecific wing venation pattern variability in Dixidae. 1-2, Wings from two different individuals of Dixella nova (USNM01193745, USNM01193785, ♀, ♂, respectively; NY). 3-4, Wings from two different individuals of Dixa terna (USNM01193791, USNM01193792, ♂, ♂, respectively; PA & VA). 5-6, Wings from two different individuals of Dixa rhathyme (USNM01193798, USNM01193868, ?, ♀, respectively; CA). 7-8, Wings from two different individuals of Dixella obscura (USNM01193908, USNM01193974, ?, ♀, respectively; AZ & AK). Collection localities are in parentheses. Arrows and arrowheads denote specific points of variation. Abbreviations: AK = Alaska, AZ = Arizona, CA = California, NY = New York, PA = Pennsylvania, VA = Virginia, USA.
