66 ROYAL SOCIETY OF CANADA 
PETROPHORA FERRUGATA, Clerck. 
Male and female moths collected in coitu, at Ottawa. Eggs laid 
23rd May, hatched 1st June. 
Egg.—Nearly elliptical oval, shiny; when laid creamy, in a few 
days turning to dull yellow, and before hatching to a dull leaden colour, 
under a lens beautifully reticulated. 
Stage I—Length 2.2 mm. Head 0.3 mm. wide, pale brown, round, 
slightly bilobed ; ocelli black ; mouth parts faintly reddish; edge of vertex 
and sides of head black; hairs on face rather longer than those on body, 
some pale and some dark. Body long and slender, pale yellowish-brown, 
slightly paler than head. After feeding the larvæ are of a greenish 
appearance. Tubercles black, small, each bearing a short, stout black 
hair. Thoracic shield concolorous with head. Skin smooth and shiny. 
No markings on the body with the exception of the pale white tracheal 
line. 
A day or two before the first moult the markings of Stage IL are 
perceptible. 
Stage II.—Length 4.5 mm. Head 0.5 mm. wide, pale in front, 
brown on cheeks. Body reddish-brown. Dorsal vessel lined with white 
on each side. A double lateral stripe of white is now present, the upper 
line of which is very irregular, or sinuous, the two lines being widest 
apart in the middle of the segments and closest together at the posterior 
margin, where the upper line drops down towards the lower. Spiracles 
small, black, lying on a white ring which throws them out in contrast. 
Infrastigmatal stripe double, irregular at the edges, most conspicuous 
on the front segments. Medio-ventral stripe double, wider than medio- 
dorsal, and the brown colour between the two lines distinct. All of 
these stripes are of a yellowish-white on a warm brown ground. 
Tubercles black, minute, narrowly ringed with white at base. In- 
Infrastigmatal stripe double, irregular at the edges, most conspicuous 
Thoracic feet and prolegs concolorous with body. 
Stage IIT.—Length 8 mm. Head 0.8 mm. wide, gray, spotted with 
dark brown, and with a black stripe across the cheeks, which is lined 
above and below with white. This stripe is really a continuation of the 
lateral band, across the face to the mouth, the dark stripe being 
an extension of the central part of the band, and the light margins of 
the band itself. Ocelli black in a grey field. Body dark purplish- 
brown, without protuberances. Longitudinal stripes almost the same as 
in previous stage, except that the medio-dcrsal stripe is much more dis- 
connected, being broken up on the abdominal segments into elongated 
diamond shaped marks, the anterior lines of which, lying on one-segment, 
are distinctly white and conspicuous, while the posterior two-thirds of 
