808 Journal of Agricultural Research voi.xx.No.ii 



pink bollworm had been found. In no instance was the pink bollworm 

 found in any plant other than cotton. 



Thirty-eight species are considered here. Of these, six are described 

 as new, and four, already described, are recorded for the first time from 

 the United States. In each case the male genitalia of the type specimen 

 of the new species are figured. The essential larval and pupal characters 

 are referred to in the text as fully as possible, and purely descriptive 

 matter is reduced to a minimum. 



FAMILY GELECHIIDAE 

 PECTINOPHORA GOSSYPIELLA (SAUNDERS), THE PINK BOLLWORM 



(pl. ioi, a, b; 103, a; 105, c, E; 106, a; 107, a-d) 



Depressaria gossypiella Saunders, 1843, in Trans. Ent. Soc. London, v. 3, pt.4, 



p. 284-285. 

 Pectinophora gossypiella Busck, 1917, in Jour. Agr. Research, v. 9, no. 10, 

 P- 34.3-3 7°- 

 Inasmuch as the immature stages of the pink bollworm have been 

 already fully described in an earlier number of this journal 1 it will be 

 necessary here only to point out the structural characters which will 

 serve to identify its larva and pupa and distinguish them from those of 

 other Lepidoptera which, because of their habits, food plants, or general 

 appearance, might be mistaken for Pectinophora gossypiella. There is 

 no easy and ready-made method which will enable a layman to distinguish 

 an insect and be certain of its identity. This applies with particular force 

 to the pink bollworm. As Busck well states — 



Definite and final determination of P. gossypiella in any stage can be made only by 

 the aid of a microscope 



and he might have added, only by one reasonably experienced in insect 

 determination and familiar with the characters used in classifying 

 Lepidoptera. Nevertheless the pink bollworm has structural characters 

 by which it can be determined and its identity established beyond the 

 possibility of doubt. The specialist alone can pass upon these with certainty ; 

 but the average intelligent worker in the field can also use them, far 

 enough at least to say what larvae or pupa? commonly found in and about 

 cotton fields can not be P. gossypiella. 



The combination of the following characters distinguishes the larva? 

 of the pink bollworm: 



Three setae (III, IV, and V) triangularly grouped on the prespiracular shield of the 

 prothorax (Ti). (PI. 103, A.) 



Setse IV and V closely approximate on the prol eg-bearing abdominal segments 

 (Am). (PI. 103, A.) 



Setae III above (not directly before) the spiracle on the eighth abdominal segment 

 (Avm). 



1 Busck, August, the pink bollworm, pectinophora gossypiella. In Jour. Agr. Research, v. o, 

 no. 10, p. 343-37°. 7 fig-, pl. 7-12. 1917. Literature cited, p. 366-370. 



