June 4, 1917 
The Pink Bollworm 
363 
larvae. Under a lens it is at once distinguished from the pink bollworm 
by the five-toothed mandibles (fig. 7) and the crotches of the abdominal 
prolegs, which form a complete circle (Pi. 10, C), not broken outwardly 
as in P. gossypiella (Pi. io, K). 
The following technical descriptions of Pyroderces rileyi will enable 
definite differentiation in all stages from Pectinophora gossypiella . 
GENERIC DESCRIPTION 
Moth. —Labial palpi very long, recurved, sickle-shaped, reaching beyond vertex; 
second joint slightly thickened by smoothly appressed scales; terminal joint longer 
than second, smooth, acute. Antennae simple, basal joint with strong pecten. Face, 
head, and thorax smooth. Forewings (fig. 5, A) narrow elongate, apex produced and 
pointed; 12 veins; ib furcate at base; 2 and 3 approximate and parallel; 7 and 8 
B 
Fig. 5 .“Pyroderces rileyi: A , Venation of forewing; B, venation of hindwing. 
out of 6; 5 out of 6; 9 connate with or out of base of 6; 11 from beyond middle of cell. 
Hind wings (fig. 5, A) narrower than forewings, attenuated lanceolate, apex pointed; 
8 veins; 6 and 7 stalked; 4 and 5 connate; 2, 3, and 4 widely separated. Posterior 
tibiae (PI. 8, D) roughly haired above. Male genitalia (PI. 8, E) with harpes and 
uncus developed; tegumen evenly chitinized. 
Larva. —Head (fig. 6) somewhat flattened, nearly quadrate, viewed from 
above, somewhat broader than long, with margin rounded and deeply incised; 
greatest width well behind the middle; incision of dorsal hind margin about one- 
third of the diameter of the head; distance between dorsal extremities of hind 
margin about one-half the width of the head. Front triangular, extending nearly to 
the incision of hind margin; adfrontal sutures straight, extending to incision of hind 
margin; longitudinal ridge short, not more than one-fourth as long as front. Pro¬ 
jection of dorsal margin over ventral one-third of the diameter of the head. Trian¬ 
gular plates of hypostoma separated by a slightly pigmented gula, elongate. Ocelli 
six; i, ii, v, and vi forming a parallelogram; ii, iii, and iv in a straight line; iii and iv 
forward of the line between ii and v; iv and v smaller than the others. Epistoma 
with the usual two pairs of setae (E l5 E 2 ) well developed. Frontal puntures (Fa) 
close together, almost on a line with frontal setae (F x ). Distance between punctures 
slightly less than distance between puncture (Fa) and setae (Fj); distance between 
frontal setae (Fj) and first adfrontal setae (Adf x ) greater than distance between ad¬ 
frontal setae Adf x and Adf 2 ; second adfrontal seta (Adf 2 ) closely approximate to begin¬ 
ning of longitudinal ridge (LR); adfrontal puncture approximate to Adf 2 . 
