298 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



species in green corn stalks and in ear tips where they were associated 

 with or followed other insects. 



Only a brief summary of some of our observations can be given at 

 this time: 1. The worms were found in every corn field observed 

 during the autumn months of 1914 and 1915. 2. The number of 

 ears infested with this species in the different fields examined varied 

 from 10 per cent to 99 per cent. 3. The worms appeared to be more 

 numerous in corn grown on hill lands than on bottom lands. Even 

 in fields containing both hill and bottom land, the worms were more 

 numerous in the corn growing on the high land. (This is probably 

 due to the better condition of the corn from the bottom lands.) 4. In 

 general early maturing corn contained fewer worms than late corn. 5. 

 Although the worms appeared most numerous in the stored corn 

 during November and December, a few were present as late as April 1. 

 6. These worms are most numerous in ears of corn that have been 

 damaged by the corn-ear worm, or by other insects, and in imperfect 

 ears; but many perfect ears that showed no sign of other injury 

 were found to contain a few of these worms. 7. The tips of the 

 ears are most'hkely to be infested but the worms may be found at 

 any part of the ears or in the cobs. 8. The number of worms was 

 apparently greatly reduced by the cold weather of January 1915 

 when the temperature dropped below 10 degrees F. on several nights. 

 9. During the fall of 1915 large numbers of dead larvae have been found. 

 The cause of their dying has not been determined definitely. 10. The 

 worms eat the corn grains by finishing grains that have been partially 

 devoured by other insects, especially near the tips of the ears; by 

 entering them from the cob and leaving only an outer shell; by tun- 

 neUing through several grains in a row; by eating the tips next to the 

 cob of several grains in a row; by eating the outer parts of several 

 grains in a row just beneath the husks; by feeding between the rows 

 and eating parts of the grains of two rows. 11. Sorghum and Kafir 

 corn heads on the college farm were badly infested with the worms 

 in July and August 1915. Specimens in Kafir corn heads from Quit- 

 man, Mississippi, sent to Washington were determined as this species 

 by Dr. F. H. Chittenden. 12. The worms have been counted from 

 several hundred ears. In December 1915, Mr. G. F. Arnold carefully 

 counted the worms in 74 ears taken at random. He found an average 

 of 4 8/37 worms to the ear. Twenty-four of these ears contained no 

 worms. The worst infestation was in a small ear of poor corn that 

 contained 50 pink worms, 2 in grains of corn, 27 between grains, and 

 21 in the cob. The next worst ear contained 41 worms, 13 in as 

 many grains, 20 between grains, and 8 in the cob. 



