Noctuidae 
(2) Agrotis ypsilon Rottemburg. (The Ypsilon Dart.) 
Syn. suffusa Denis & Schiffermuller; telifera Harris; idonea Cramer. 
This is an exceedingly common species, which occurs every¬ 
where in Canada and the United 
States. It is also found in Europe. 
Its larva is one of the species, 
which under the name of “cut¬ 
worms,” are known to inflict ex¬ 
tensive injuries upon growing 
plants. They burrow into the 
loose soil during the day, and 
come forth at night and do their 
mischievous work. They are a 
plague to the market-gardener [ n particular. 
(3) Agrotis geniculata Grote & Robinson, Plate XXI, 
Fig. 36, $ . (The Knee-joint Dart.) 
Not a scarce species in the northern Atlantic Subregion. 
Fig. ioy— Agrotis■ ypsilon. 
(After Riley.) 
Genus PERIDROMA Hubner 
This is a moderately large genus, represented in the United 
States and Canada by about a dozen species. Half of these we 
illustrate. 
(1) Peridroma occulta Linnaeus, Plate XXI, Fig. 42, ?. 
(The Great Gray Dart.) 
The habitat of this insect is the northern portion of our 
territory. 
(2) Peridroma astricta Morrison, Plate XXI, Fig. 41, 9. 
(The Great Brown Dart.) 
The species is found in the northern parts of the Atlantic 
Subregion, and also in Colorado. 
(3) Peridroma nigra Smith, Plate XXI, Fig. 43, ? . (The 
Great Black Dart.) 
Found in Colorado and Wyoming. 
(4) Peridroma saucia Hubner, Plate XXI, Mg. 40, ? ; 
Egg, Text-figure No. 2. (The Common Cut-worm.) 
Syn. inermis Harris; ortonii Packard. 
Almost universally distributed throughout the United States 
and southern Canada. It also occurs in Europe. 
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