June, '19] HARTZELL: PINE TUBE MOTH 233 



3. Large ear worm larva in tip of ear of sweet corn. Note that many silks leading 

 to tip ovules have been severed. 



4. Ear of hardened field corn with its tip ruined by ear worm. Note larval excre- 

 ment and partly visible ear worm eating the germ part of the kernels. 



5. Hole in husk of field corn through which ear worm larva left the ear. 



6. An ear of white field corn showing serious side and tip ear worm injury which 

 has been invaded by molds. 



7. Severe ear worm injury to tip of ear of Stowell's Evergreen sweet corn showing 

 excrement of larva and how entire kernels are devoured when corn is soft. 



8. Nubbin cf white field corn apparently caused by ear worm preventing fertiliza- 

 tion by destruction of silk. Note furrow on tip of cob where ear worm almost 

 encircled the same, severing the silks as it went. 



9. Series of hard kernels of field corn showing ear worm preference for the germ 

 part of the kernel. All kernels shown dropped from the ear when husked or handled. 



NOTES ON THE LIFE HISTORY OF THE PINE TUBE 

 MOTH> (EULIA PINATUBANA KEARFOTT) 



By Albert Hartzell, Ames, Iowa 



The presence of the larvae of this insect in injurious numbers on 

 white pine (Pinus strobus L.) in the vicinity of Ithaca, N. Y., offered 

 an opportunity to study the habits of this interesting species. The 

 work was done under the direction of Prof. Robert Matheson of Cornell 

 University to whom the writer is deeply indebted for suggestions and 

 criticisms. At the time the work was begun very little was known 

 regarding the life history of the pine tube moth which, until 1905, had 

 been confused with a European species, Eulia politana Haw., of 

 widely different habits. The first reference to the pine tube moth was 

 by Comstock^ in the report of the United States Department of 

 Agriculture for the year 1880. In 1905, Kearfott^ recognized it as a 

 new species under the name of Eulia pinatuhana. 



The Moth 



The adult is a small trim moth with a wing expanse of about 14 mm. 

 The head, fore wings, and thorax are of a rust-red color. The fore 

 wings have two lighter oblique lines crossing them; the hind wings 

 and the dorsal side of the abdomen are silky gray. 



The first moth reared by the writer emerged April 13, 1915. The 

 moths continued to emerge under insectary conditions until April 20. 

 From examination of the pupal cases, emergence is accomplished by 

 the splitting of the pupal thorax along the median line, usually as far 



' Contril)Ution from the Entomological Laboratory of Cornell I'nivorsity. 

 2 1S81. Conistock, J. H. Report of V. 8. Comm. Agr., 1S80, p. 204-205. 

 » 1905. Kearfott, W. D. Canadian Entomologist, 37: 9-10. 



