482 “P. W. CLAASSEN 
adults failed to mate and lay eggs in captivity. However, no larvae 
were observed at work on the cat-tails later in the season. Therefore 
it is likely that if there is a later generation, it occurs on another plant. 
Description of the stages 
The larva.— The color markings of the larvae (Plate XLVII, 67) vary 
somewhat in different individuals, but mainly only in the degree of 
intensity of the colors. They may be described as follows: 
General ground color light brown with a slight tinge of flesh color. Head light brown, 
mottled or speckled with darker brown. Epicranial suture, mandibles, and area just above 
the clypeus and laterad, darker brown. Six longitudinal, flesh-colored to brownish stripes 
along the entire length of the body. On each side of the median dorsal line two broad stripes; 
and laterad to these stripes narrow stripes, located on the lateral margin of the body. Above 
the spiracles another broad stripe. Below the spiracles, often, another more or less broken 
line, especially noticeable in the young larvae. Prothoracic shield light brown. At the 
base of the hairs on the body a dark brown spot. Dorsal surface of the last abdominal 
38 
segment light brown, speckled with darker spots. Ventral side of the body of a light yellowish | 
color. Length of full-grown larva, from 40 to 50 mm.; width, from 4.5 to5 mm. Larva — 
cylindrical in shape and not as muck flattened as the larva of Arzama obliqua. 
The pupa (Plates XLII, 33, and XLVII, 71) 
Average length 27 mm.; width 7 mm. Color reddish brown, with head, thorax, and 
cremaster darker brown. Head with a conical projection about 2 mm. long. Wings 
extending backward over three-fourths of the fourth abdominal segment. Prothorax half 
: 
as long as the mesothorax. Surfaces of the head and thorax nearly smooth. Anterior — 
margin of labrum sinuate. Labial palpi about two and one-half times as long as the labrum. 
Maxillae extending about one-sixth of the distance along the fourth abdominal segment. 
Maxillary palpi present as small triangular pieces. Prothoracie femur visible. Prothoracic 
legs extending two-thirds the length of the maxillae. Mesothoracic legs reaching a little 
beyond the tips of the maxillae. Antennae reaching a point half-way between the tips 
of the mesothoracic legs and the tips of the maxillae. Metathoracic tarsi visible. Abdominal 
segments 2 to 7, inclusive, dorsally roughened with tubercles, especially prominent on 
segments 5, 6, and 7. Cremaster somewhat bilobed, with a rough margin bearing four 
straight setae, two originating underneath, and the other two originating above, laterad 
to the median line. All these setae equidistant from each other, the middle ones being longer _ 
than the outer ones. 
The adult—— The adult (Plate XLYVII, 68) is of a pale reddish or yellow- 
ish color, measuring about 35 millimeters across the extended wings. The 
original description of the adult, as found in Grote (1882), is as follows: 
Male. Pale reddish or yellowish gray, something the color of Mythimna, Pseudargyria, 
Guen. Primaries somewhat oblong, internal angle rounded away; apices softened, costa 
