824 Journal of Agricultural Research voi.xx.xo. » 



margin of termen of forewing pronounced and blue-black, extending 

 from the apex only a little over one-half the length of the termen, the 

 white scaling of the tornal area extending into the cilia of the anal angle 

 which are also white. In E. discretivana there is none of the blue-black 

 scaling so noticeable in E. obfuscana, and the entire termen is faintly- 

 dark margined. The cucullus of the harpes of the male genitalia is also 

 more narrowly elongate in E. obfuscana than in E. discretivana. 



The larva is in general structure very like Crocidosema plebeiana, except 

 that setse I, III, IV, and V on the ninth abdominal segment are about 

 equally spaced and the anal fork is lacking. The body is cream-white 

 without markings; chitinized areas about body tubercles not pigmented; 

 hairs whitish yellow; thoracic and anal shields pale yellow, scarcely 

 pigmented; head light brown; crochets brown, 28 to 30, uniordinal and 

 in a complete circle; length, full-grown, 10 to 10.5 mm. 



The pupa is similar to that of Crocidosema plebeiana but somewhat 

 larger, 8.5 to 9 mm. long by 2.5 mm. wide. 



The two species are easily distinguished by their food plants and larval 

 habits. 



EUCOSMA HELIANTHANA (RILEY) 



Semasia helianthana Riley, 1881, in Trans. St. Louis Acad. Sci., v. 4, p. 319. 

 Thiodia helianthana Dyar, 1903, in List North Amer., Lep., no. 5186. 

 Eucosma helianthana Barnes and McDunnough, 1917, Check List Lep. Bor. 

 Amer., no. 7081. 

 We found a larva about the size of the pink bollworm and superficially 

 resembling it feeding in the flower heads and on the seeds of the large 

 garden sunflower. It was somewhat pinkish and had a pale kidney- 

 shaped spot on the thoracic shield similar to that of Pectinophora. It 

 had the characteristic olethreutid arrangement of setse on the ninth 

 abdominal segment and proved to be the caterpillar of Eucosma helian- 

 thana Riley, a species limited in food plant as far as I know to Helianthus. 

 As the pink bollworm does not attack sunflower and E. helianthana does 

 not attack cotton, there is no reason to confuse the two. The structural 

 differences are also easily seen under a binocular or a strong hand lens. 



The pupa is similar to that of Crocidosema plebeiana but larger, about 

 the size of that of Eucosma discretivana. 



Larvae were collected at Dickinson, Tex., September 28, 191 8, and 

 pupae also were found at Smith Point, August 30, 1918. From the latter 

 a moth was reared September 3 of the same year. 



EASPEYRESIA TRISTRIGANA (CEEMENS) 



Stigmonota tristrigana Clemens, 1865, in Proc. Ent. Soc. Phila., v. 5, p. 133. 

 Enarmonia tristrigana Dyar, 1903, List North Amer. Lep., no. 5275. 

 Laspeyresia tristrigana Barnes and McDunnough, 1917, Check List Lep. Bor. 

 Amer., no. 7220. 

 On the prairie lands and along the fences adjoining fields-that had been 

 planted in cotton the previous year (191 7) we frequently found a white 



