. Bulletin. Natural history; Natural history. 66 ILLINOIS NATURAL HISTORY SURVEY BULLETIN \'ol. 21, Art. 3. SiRlICTlIRES OF AND Fig. 40.—Costal area of front wint; of S. Fig. 46.—Lateral view of bursa copulatrix ot :ilcibella. S. infumala. Fig. 41.—Costal area of frcint wing of .S". Fig. 47.—Dorsal view of head of male i\ niohri. i-otunda. Fig. 42.—Costal area of front wing of S. Fig. 48.—Dorsal view of head of .9. «^Mrt'larc and hooks; h, humeral cross-veins; o, ovipositor; 7, 8, 9, abdominal sternites. KEY TO NEARCTIC SPECIES OF SIALIS—Concluded of a tuft of hai
. Bulletin. Natural history; Natural history. 66 ILLINOIS NATURAL HISTORY SURVEY BULLETIN \'ol. 21, Art. 3. SiRlICTlIRES OF AND Fig. 40.—Costal area of front wint; of S. Fig. 46.—Lateral view of bursa copulatrix ot :ilcibella. S. infumala. Fig. 41.—Costal area of frcint wing of .S". Fig. 47.—Dorsal view of head of male i\ niohri. i-otunda. Fig. 42.—Costal area of front wing of S. Fig. 48.—Dorsal view of head of .9. «^Mrt'larc and hooks; h, humeral cross-veins; o, ovipositor; 7, 8, 9, abdominal sternites. KEY TO NEARCTIC SPECIES OF SIALIS—Concluded of a tuft of hairs. Median depression of eighth sternite not as large 25 Eighth sternite narrow and divided into two separate lobes by a median de- sion, fig. 57 aequalis, vagans Eighth sternite either wider, fig. 60, or not divided so completely into two separate parts, fig. 54 26 Eighth sternite as in fig. 60, rectangular and with the distal portions set out as distinct swellings infumata Eighth sternite not as in fig. 60, either with apex rounded out, fig. 53, or not set off with such conspicuous lobes 27 sternite flat, not tilted so that the apical margin is raised, fig. 54. Bursa copulatrix with a terminal fingerlike process velata, itasca Eighth sternite tilted so that the apical margin is markedly raised and basal margin depressed, figs. 53, 59. Bursa copulatrix with terminus triangular, fig. 53 28 Species occurring only east of the Great Plains region iola, joppa Species occurring only west of the Great Plains region 29 Median depression situated near the tip of a long, slender mesal process on the apical margin of the eighth sternite, fig. 52 hamata Median depression not situated on such a long slender process 30 Apex of eighth sternite not evenly rounded, fig. 59. Lateral area of eighth sternite with abundant and dark setae californica, occidens Apex of eighth sternite evenly rounded, much as in fig. 53. Lateral area of eighth sternite with considerably less ab
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