ECONOMIC ZOOLOGY ENTOMOLOGY. 653 



commenced by the senior author in 1S89 in which year it was very common 

 and has since remained so. It is not as common in some seasons as it is 

 in others; it may be difficult to find in a locality one summer and appear in 

 very great numbers in anothei*. In 1803 it was observed working on tobacco 

 and has since been found constantly present where tobacco is grown next to 

 corn. The authors' observations indicate that tomatoes are not the favorite 

 food, but that the worms feed upon them when corn becomes too ripe or none 

 is to be found. 



In 1907 plantings of several widely dilTerent varieties of corn, including 

 Held and table varieties, were made with the view of determining its prefer- 

 ence, if any, and the time at which corn is most subject to injury. The results 

 which are presented in tabular form show an increase in the injury with the 

 advance of the season, the early plantings, without rogai'd to variety, generally 

 showing less injury than those planted later. 



" Sirup baits constantly used with a view to showing when the moths were 

 abroad in the field failed to attract a single one. Electric lanterns of excellent 

 quality also failed to attract the moths though kept in some cases in the midst 

 of corn. Larvje of the second brood were secured in August, and on the 

 twelfth to the nineteenth of the month left the corn for pupation. Adults from 

 these pupa? emerged in early September (August 2S to September 9) in con- 

 fined examples, and on the eleventh eggs were found attached to the silks. 

 Larvfe hatched from some of these eggs September 14, and pupated October 17. 

 Adults of one or another brood were abi'oad during all this period, apparently. 

 On September 11 eggs were found attached to silks. On October 9 . . . corn 

 planted August 5 was found to have eggs on every ear, sometimes six or eight 

 on the silks, occasionally one at the edge of the husks. They were noted as 

 abundant again on the nineteenth and twenty-second. On the twenty-fourth 

 they were noted as hatching, and individuals of the brood were confined and 

 followed to maturity." A record is given of 1G5 moths reared in the laboratory 

 from eggs that were laid from September 7 to 11, the first adults emerging 

 on September 28 of the same year and the last on August 14 of the following 

 year. Hearings showed that the minimum time required for complete devel- 

 opment from egg to adult was about one month and three or four days. " The 

 fact is patent that the corn earworm begins its injuries in the spring as soon 

 as it finds suitable food and continues producing broods at the rate of about 

 one a month until severe frost destroys its food again in the fall." 



"Taking the average period of a brood as about 32 days, from egg laying to 

 egg laying, and beginning with the brood represented by the example secured 

 June 13 and emerging July 11, ending with that reared in September and Octo- 

 ber, it appears that three broods developed as follows: (Brood 1) egg about 

 June 10, pupa June 26, adult July 11; (Brood 2) egg July 13. pupa July 28, 

 adult August 12; (Brood 3) egg August 14, pupa August 29, adult September 

 12; (Brood 4) egg November 3. Brood imperfect owing to frost." 



Observations made in 1913 at Hickman, the only region in which cotton is 

 grown in Kentucky, are reported. The life periods as observed in 1913 are 

 detailed in tabular form. In observations made in Novemher, 1911, in plats 

 planted in corn, pupre were taken from the soil at depths varying from 1 to 7 

 in. and at distances from the nearest corn stalk varying from 4 in. to 2 ft. 4 in. 



.Tests of the value of arsenate of lead paste and powder in 1914 in the con- 

 trol of the pest on corn failed to justify the exi^ense involved. Mention is made 

 of a bacterial disease observed in the fall of 1911. 



Biological notes are presented upon seven different in.sect enemies observed 

 during the course of the work. Tnchn(jnim»m prrfiosa parasitized 81 of 1,661 

 bollworm eggs collected in 1913. The larva of a telephorid beetle, perhaps 



