. Journal of agricultural research . , and the opening in the topto receive the cone was provided with a felt gasket. A ball of absorbentcotton tied in muslin and dropped into the cone further retarded theescape of the hydrocyanic-acid gas. A glass vessel with rounded bottom Turner, W. B. female lepidoptera at light traps. In Jour. Agr. Research, v. 14, no. 3,p. Literature cited, p. 148-149. Journal of Agricultural Research, Vol. XVIII, No. 9 Washington, D. C. Feb. 2, 1920 tn Key No. K-Sa (475) 476 Journal of Agricultural Research voi. xvm. No. 9 held the charge of sodium cyanid
. Journal of agricultural research . , and the opening in the topto receive the cone was provided with a felt gasket. A ball of absorbentcotton tied in muslin and dropped into the cone further retarded theescape of the hydrocyanic-acid gas. A glass vessel with rounded bottom Turner, W. B. female lepidoptera at light traps. In Jour. Agr. Research, v. 14, no. 3,p. Literature cited, p. 148-149. Journal of Agricultural Research, Vol. XVIII, No. 9 Washington, D. C. Feb. 2, 1920 tn Key No. K-Sa (475) 476 Journal of Agricultural Research voi. xvm. No. 9 held the charge of sodium cyanid and was provided with a wire-clothcover having at its center a square of wood bored to receive the stemof a small glass funnel. About five minutes were required to place theplug of cotton, pour the 25 per cent sulphuric acid into the glass tube,remove the dead moths, introduce a fresh charge of cyanid, and removethe tampon from the cone. The trap was crated so that the door could be wedged tightly and thetrap be made easy to Fig. I.—Light trap; A, opening for cone; BBBB, plates of glass; C, glass tube to convey acid; D, glassjar to hold cyanid; E, glass funnel. RESULTS OF EXPERIMENTS As has been stated, collections were made on 28 full nights betweenMay 14 and September 13, The total of 3,152 moths recorded for thatperiod embraces sixty-odd species. Of this total, 2,200, or percent, are males; and 952, or per cent, are females. Table I givesan itemized account of the species, the numbers taken of each sex, andthe percentage of males and females. In two species, Noctua c-nigrumand Euparthenos nubilis, the two sexes are equally represented; and ofthose species of which at least five individuals were taken, three showa preponderance of females. Feb. 2, 1920 Lepidoptera at Light Traps 477 Table I.—Number and percentage of males and females of various species of Lepidopterataken at a light trap, Hagerstown, Md., igi8 Species. Number ofmales. Numberof fe-males.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1913
