. Bulletin. Natural history; Natural history. 172 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 a tuft of long setae at apex and long, lateral processes, fig. 596 ocellifera, p. 172 Tenth tergite convex, with a pair of dorsal rows of setae and without lateral processes, fig. 597 angustipennis, p. 174 5. Bursa copulatrix with a high, triangu- lar ventral keel, fig. 598 semifasciata, p. 173 Bursa copulatrix with a short ventral process which forms a transverse fork or short plate, figs. 6 6. Ventral process of bursa forming a short fork which is narrow and small, fig. 599 p
. Bulletin. Natural history; Natural history. 172 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 a tuft of long setae at apex and long, lateral processes, fig. 596 ocellifera, p. 172 Tenth tergite convex, with a pair of dorsal rows of setae and without lateral processes, fig. 597 angustipennis, p. 174 5. Bursa copulatrix with a high, triangu- lar ventral keel, fig. 598 semifasciata, p. 173 Bursa copulatrix with a short ventral process which forms a transverse fork or short plate, figs. 6 6. Ventral process of bursa forming a short fork which is narrow and small, fig. 599 postica, p. 173 Ventral process of bursa transverse and platelike, its tip emarginate and sometimes forming a very broad V, figs. 600, 601 7 7. Ventral process of bursa with the an- terior face forming a short mesal keel, fig. 600. . .angustipennis, p. 174 Ventral process of bursa with the an- terior face slightly carinate at each lateral margin where it joins with base, fig. 601, but without a mesal keel ocellifera, p. 172 Ptilostomis ocellifera (Walker) Neuronia ocellijera Walker (1852, p. 8); of. Neuronia simulans Betten & Mosely (1940, p. 107); 9. New synonymy. Larva.—Length 27 mm. Head, pronotum and legs yellow; head with two pairs of black lines, one on each side of the frons and one on the lateral margin; pronotum with posterior margin black and with an arcuate dark brown line starting at each antero- lateral corner and running to about the middle of the mesal margin. Case.—Very long, usually about 50 mm. Adults.—Length 21-24 mm. Color yel- lowish brown, the front wings minutely speckled with darker brown, hind wings sometimes with a V-shaped dark brown mark which is small or even completely ab- sent in some specimens. Male genitalia, fig. 596: tenth tergite long and somewhat rec- tangular with a pair of long, stout lateral arms arising from base, and a pair of spiny processes arising from ventral margin near middle; the apex of the tergite bears a pair of long,
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