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 

 FlG - 10 ki: Ag ^ s yP silon - come forth at night and do their 



(After Riley.) 



mischievous work. They are a 



plague to the market-gardener in particular. 



(3) Agrotis geniculata Grote & Robinson, Plate XXI, 

 Fig. 36, 2 . (The Knee-joint Dart.) 



Not a scarce species in the northern Atlantic Subregion. 



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, ?. 

 (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, Fig. 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. 



182 



