426 THE AMERICAN NATURALIST.  [Vor. XXXVI. 
to the glass could be seen through until after the third night, 
so that it must have required more than three days to con- 
struct the cocoon. 
The mandibles (Fig. 15, zz) of the pupa are toothed on their 
inner edges for the purpose of enabling it to bite a hole in the 
cocoon when the metamorphosis has been completed. I did 
not have an opportunity to observe the escape of the imago. 
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. Figs. 5-1 t. — Ulula Ayalina. Larva. Fig. s, three small setæ seen in optical section and a 
f ng one, surface view; Fig. 6, the head of a larval skin of the first moult, 
ith 
E 
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oO 
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a 
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a3 
o 
o 
o 
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c, clypeus; 7 labrum; a, mandible; »', maxilla; 
2 seb ?; »'", mentum ; 2, labial palpus ; 4, point of contact of mentum and clypeus ; 
, lobe of th n; y, lobe of the gena ; o, ocular peduncle 

Below I have added descri 
ptions of the egg, repagulum, larva, 
pupa, and cocoon. i 
Egg and Repagulum. 
. The repagula are abortive eggs. Some tubules of the ovary bear eggs, 
According to Guilding the eggs are placed in a double alternating series 
of 64 to 75, near the extremity of the branch, and the repagula (barriers) 
are placed in circles around the branch, below the eggs (Fig. 3). 

