. Bulletin. Natural history; Natural history. 270 Illinois Natural History Survey Bulletin Vol. 31. Art. 7. Fig. 22-28.—Bittaeus fore wings. 22.—B. apicalis. Pt, pten 24.—B. pilicornis. AC, apical crossvein. 25.—B. oecidentis. ScC B. strigosus. Th, thyridium. 27.—B. stigmaterus. 28.—B. texani ills. Pt, pterostigma. 23.—B. punctiger. '"' — 'i. ScC, subcostal crossvein. 26.— texanus. KEY TO THE MIDWESTERN SPECIES OF BITTACUS 1. Apices of wings dark brown (Fig. 22) apicalis Apices of wings not dark brown ... 2 2. Apical crossvein present (Fig. 24).. 3 Apical crossvein absent (Fig. 25)... 4 3
. Bulletin. Natural history; Natural history. 270 Illinois Natural History Survey Bulletin Vol. 31. Art. 7. Fig. 22-28.—Bittaeus fore wings. 22.—B. apicalis. Pt, pten 24.—B. pilicornis. AC, apical crossvein. 25.—B. oecidentis. ScC B. strigosus. Th, thyridium. 27.—B. stigmaterus. 28.—B. texani ills. Pt, pterostigma. 23.—B. punctiger. '"' — 'i. ScC, subcostal crossvein. 26.— texanus. KEY TO THE MIDWESTERN SPECIES OF BITTACUS 1. Apices of wings dark brown (Fig. 22) apicalis Apices of wings not dark brown ... 2 2. Apical crossvein present (Fig. 24).. 3 Apical crossvein absent (Fig. 25)... 4 3. Hind femora with brown spot sur- rounding base of setae ... .punctiger Hind femora without brown spot sur- rounding base of setae pilicornis 4. Subcostal crossvein distal to first fork of radial sector (Fig. 25) .... oecidentis Subcostal crossvein basal to first fork of radial sector (Fig. 26) 5 5. Wing membranes colorless. Cross- veins margined (Fig. 26) ... .strigosus Wing membranes yellow to pale brown. Crossveins usually not mar- gined (Fig. 27) 6 6. In males, lobe of ninth tergum in dorsal view with two medial prom- inences, each prominence bearing several black spines (Fig. 40). In females, wing color yellow to amber stigmaterus In males, lobes of ninth tergum in dorsal view with one medial prom- inence bearing several black spines, and each lobe with a row of 10-15 thick black spines basal to medial prominence (Fig. 42). In females, wing color brown to dark brown texanus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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