. Bulletin. Natural history; Natural history. HEBARD: DERMAPTERA AND ORTHOPTERA OF ILLINOIS 169 Beach: Aug. 21, 1906, 19 with pale mediolongitudinal dorsal band and broad dark margins opposite shoulders, in swamp. Hart. Chicago: Apr. 28, 1906, 3cf, 19, 1 pair with pale mediolongitudinal dorsal band, on beach of Lake Michigan. Lake Villa: Aug. 10, 1906, Icf, 19, in swamp. Hart. Algonquin: Apr. 14, 1895 to Oct. 9, 1905 and 1908, 4cf, 39, 19 with striking bufF mediolongitudinal dorsal band. Bloomington: Nov. 3, 1883, 19 with lat- eral margins of pronotum narrowly pale. Homer: May 16, 1906, 2 0^,
. Bulletin. Natural history; Natural history. HEBARD: DERMAPTERA AND ORTHOPTERA OF ILLINOIS 169 Beach: Aug. 21, 1906, 19 with pale mediolongitudinal dorsal band and broad dark margins opposite shoulders, in swamp. Hart. Chicago: Apr. 28, 1906, 3cf, 19, 1 pair with pale mediolongitudinal dorsal band, on beach of Lake Michigan. Lake Villa: Aug. 10, 1906, Icf, 19, in swamp. Hart. Algonquin: Apr. 14, 1895 to Oct. 9, 1905 and 1908, 4cf, 39, 19 with striking bufF mediolongitudinal dorsal band. Bloomington: Nov. 3, 1883, 19 with lat- eral margins of pronotum narrowly pale. Homer: May 16, 1906, 2 0^, 1 with pale mediolongitudinal dorsal band, Hart. Urbana: Mar. 24 to Sept. 9, 1889 to 1905, 7cf. 39. A. acadicum acadicum (Scudder).—This is probably a rarer tettigid but of local occurrence over all of Illinois. Peoria: Sept. 9, 1905, 19. Homer: June 10, 1926, 19, Frison. Urbana: Sept. 9, 1898, Id', Wood worth; Sept. 13 and 14, 1909, 29. Champaign: May 8, 1886, 19, Forbes and Weed. Mahomet: Apr. 23, 1925, 19, Frison. Carbondale: Apr. 23, 1925, Id", Chandler. Elizabethtown: Aug. 8, 1905, 19. Kamak: Sept. 2, 1924, 19, Fig. 155.—Adult male of the pygmy locust Ac7idiiim ornatnm (Say). X 9. A. ornatum (Say).—In the vicinity of Chicago the insect usually shows extreme depauperation, but some of the specimens from Muncie, Homer, Urbana, Quincy, Dubois and Pulaski are unusually large and robust with mediolongitudinal carina of pronotum slightly more decided than usual and are consequendy difficult to separate from small in- dividuals of acadicum acadicum. This common species was correctly recorcied by Thomas (1876) and McNeill (1891), but by the latter in addition as the synonym triangularis. The insect is to be found over all Illinois. Seventy-five males, 90 females and nine immature specimens were taken at Beach, Waukegan, Summit, Chicago, Pullman, Deep Lake, Algonquin, Elizabeth, Fulton, Bradford, Ashkum, Kappa, Loda, Paxton, Ludlow, Rantoul, Normal, Bloomington,
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