Mar. r, 1921 Lepidoptcra Likely to Be Confused with Pink Bollworm 823 



the plants infested, but occasionally also on the pollen of the flowers. The 

 species is of special interest because its work and habits are almost identical 

 with those of the genus Pectinophora and also because the larva is fre- 

 quently pinkish and often has the outer crochets of the prolegs weakly de- 

 veloped or absent. It is easily mistaken for a half -grown pink bollworm. 

 It is readily distinguished, however, by the structural characters here fig- 

 ured (PI. 102, 103, 105, 106). The linear arrangement of setae III, IV, and 

 V on the prothorax, the position of III anterior to the spiracle on the eighth 

 abdominal segment, the well-developed anal fork (PI. 105, G), and the 

 olethreutid grouping of the setae on the ninth abdominal segment (PI. 

 103, E) separate it from all the larvae treated in his paper. 



The characters of the pupal abdomen are shown on Plate 108, A-D. 

 Eucosma discretivana Heinrich and E. helianthana Riley exhibit 

 similar structures, but as neither of these species attacks Malvaceae 

 there is little or no likelihood of confusing them with Crocidosema, 

 We did not find C. plebeiana in cotton, but there appears to be no reason 

 why it should not attack that plant; and its possible presence and con- 

 fusion with the pink bollworm should be borne in mind in cotton in- 

 spection. 



The male genitalia of the adult are shown in Plate 99, A. 



EUCOSMA DISCRETIVANA, N. SP. 



(PL. 99, B) 

 Eucosma discretivana, n. sp. 



Antennae, palpi, face, and head dull, somewhat ashy fuscous. Thorax pale, dull 

 fuscous; tegulse fuscous with a very slight bronzy tint. Forewings dirty grayish 

 white marked with grayish fuscous; an outwardly angulate grayish fuscous basal patch 

 slightly wider on costa than dorsum; a somewhat paler, semioval patch on dorsum 

 before tornus and extending half way to costa; several narrow, obscure lines of fus- 

 cous scales extending outwardly from costa and faintly streaking the white areas; a 

 similar faint line extending from dorsum through middle of white area bordering basal 

 patch; entire termen narrowly margined by pale grayish fuscous: the wnitish areas 

 of the wing most pronounced just beyond basal patch and near tornus; cilia grayish; 

 costal fold deeply appressed and reaching nearly to middle of wing. Hindwings dull, 

 smoky fuscous, cilia grayish white with a dull fuscous band along their base. Abdo- 

 men grayish fuscous with silvery white scales along the sides and a few scattered silvery 

 scales beneath. Legs fuscous, shading to dirty gray-white on inner sides. Male 

 genitalia of type figured (PI. 99, B). Alar expanse 13 to 16 mm. 



Habitat. — Sheldon, Tex. (A. C. Johnson). 



Food plant. — " Wild myrtle. " Larva boring in the stem and forming a gall. 



Type. — Cat. No. 23743, United States National Museum. 



Described from male type and three male and five female paratypes 

 reared by A. C. Johnson, April 10 to 23, 1919, from larvae collected by 

 him March 14, 191 9. 



It is very close to Eucosma obfuscana Riley, which it strikingly resem- 

 bles. The two species are, however, readily distinguishable on both 

 genitalia and slight but constant color differences. In E. obfuscana the 

 face, head, thorax, and base of antennae are inky blue-black, the dark 



