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. 599-601 ... 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, curved setae; ninth sternite pro- 

 duced beneath and beyond base of claspers, 

 the apex of the ventral margin forming two 

 stout teeth, the dorsal margin with a row 

 of irregular teeth. Female genitalia, fig. 

 601 : bursa copulatrix with a relatively short 

 body bearing a ventral transverse projec- 

 tion which extends platelike at right angles 

 to the surface and is usually emarginate at 

 apex; this projection is anchored at its base 

 with a short carinate brace at each lateral 



600 \i\h 

 B (ik' 



ANGUSTIPENNIS ( 



Figs. 598-601.— P/;7oj/ow/.f, female genitalia. A, ventral aspect; B and C, bursa copula- 

 trix, ventral and lateral aspects. 



