Mar. i, 1921 Lepidoptera Likely to Be Confused with Pink Bollworm 813 



subdorsal and lateral spots are also fused; legs pale yellow; crochets 

 light brown, 18 to 20 in a complete circle, unevenly biordinal; thoracic 

 shield divided by a thin median longitudinal pale line, yellow with a 

 broad shading of fuscous on the lateral extremities and a smaller fuscous 

 patch at the center of the anterior dorsal margin; anal shield yellow 

 laterally shaded with fuscous; other chitinized areas smoky fuscous, 

 tubercles moderately chitinized; hairs moderately long, slender, yellowish. 

 Head light yellow with a narrow black shading at posterior lateral incision 

 of hind margin and a similar black dash on ventral margin of epicranium 

 adjacent to triangular pjate of hypostoma; ocellar pigment black, con- 

 tinuous under all the ocelli. 



The larva is very similar in superficial appearance to the scavenger 

 worm (Pyroderces rileyi Wlsm.). It differs most strikingly in the ar- 

 rangement of the red markings, which are in spots or blotches rather 

 than in continuous bands, and in the possession of a well-developed 

 anal fork (PI. 105, F) entirely lacking in P. rileyi and the pink bollworm. 



The pupa is easily distinguished from those of the other Lepidoptera 

 treated in this paper by the peculiarly scalloped and fringed posterior 

 margin of its eighth abdominal segment. (PI. 109, G.) 



ISOPHRICTIS SIMIUEU-A (CHAMBERS) l 

 (PL. 95, A; 102, F) 



Gelechia similiclla Chambers, 1872, in Canad. Ent., v. 4, p. 193. 

 Paltodora similiclla Busck, 1903, in Dyar, List North Amer. Lep., no. 5548. 



In the dead flower heads of Rudbeckia sp. (commonly called "nigger 

 heads" in many parts of Texas) there are two species of lepidopterous 

 larvae which many nonentomologists have confused with Pectinophora 

 gossypiella. One of these when mature is about the same size as and 

 superficially like a full-grown pink bollworm. It is an olethreutid, how- 

 ever, and as such is easily distinguished by the setal arrangement of the 

 ninth segment which readily separates the two families Gelechiidae and 

 Olethreutidae. In the former the paired setae II on the dorsum of the 

 ninth segment are no closer together than the paired setae I on the dorsum 

 of abdominal segment 3 (Pi. 105, C) and I is as near II as it is III on the 

 ninth abdominal segment. In the Olethreutidae, on the other hand, 

 the paired II on the dorsum of the ninth abdominal segment are on a 

 single chitinization and closer together than the paired I on the eighth 

 abdominal segment. Also I and III are closely approximate (Pi. 105, B). 

 We have not succeeded in rearing the moth, so specific determination 

 can not be given. The family position of the larva, however, is certain. 



1 The genus Isophrictis has been erected by Meyrick for those species formerly listed under the genus 

 Paltodora Meyrick having the second joint of the labial palpi clothed beneath with long rough spreading 

 hairs and having veins 7 and 8 of forewings out of 6. It replaces Paltodora for the North American species. 

 (Meyrick, E. on the genus paltodora. In Ent. Mo. Mag., v. 53.no. 636 [s. 3, v. 3, no. 29], p. 113. 1917-) 



