| OCR Text |
Show KEYS TO THE FAMILIES AND GENERA Adults 1. Stem of veins MP and CuA strongly divergent at toward CuA basally (Figs. 2, 9, 16); MA in hind wings simple, unforked; hind tarsi four segmented base with bent MP2 strongly ••.......••.••...••..•.•.• Stem of veins 2 MP and CuA slightly divergent and MP2usually more symmetrical (Figs. 27, 37, 39, 52); MA in hind wings simple or forked, or hind wings absent; hind tarsi four or five fork of s 2. (1) egmen t ed MA 0 of vein mbre .. basal •••• fore MA vein of ••••••• (2) fore near or CuP variable small Cubital not Al (Figs. 4. (11 the near 0 ••••••• 0 ••••• not more than • 0 • " •• 4 two wing base, radial intercalaries (Figs. 2, 16, 10 three and sector; between CuA lS) ••••••.••.•..•.....••...• 3 forked apically; vein Al posterior margin wing by a series veinlets (Fig. 2) EPHEMERIDAE, of •.•.••••••• He'X_agerilia simple, not forked; vein posterior margin of wings EUTHYPLOCIIDAE, intercalaries attached 16, lS) veins to ••••.•••••••••.•.•.•••.••.•• lie beneath convex mostly absent, so veins; there or less appears cross to vena- OLIGONEURIIDAE, veins reach wing margin in veins present; cross intetealary dependently; venation normal (Figs 27, 34, 39, 46) and 11 inter •••..•. Concave 0 wing, sector; longitudinal veins; eight tion greatly reduced (Figs. 21, 24) be 0 base of radial the fork of to Concave veins calary to intercalaries attached •••••• between CuA and CuP forked wing the distance Cubital of fork of , POLYMITARCIDAE, number and form of 3. •••••• intercalaries apically of and " wing forked than the long simple (Fig. 9) fourths , 12 convex ••...•••..••••....••• The fork of vein MA with veins IMA and detached basally, 1ikewise on MP, IMP, MP2 detached basaiy (Fig. 27); short 5 MA2 and single paired intercalares in interspaces along wing margins; hind wings small or absent or ••..••.. BAETIDAE, 14 |
