<: 



28 MONTANA BULLETIN 150 



Oyster-Shell Scale {Lepidosaphes ulmi L.). This scale is an ever- 

 present enemy of the fruit grower in western Montana, especially 

 near Missoula and Grantsdale. In the case of crabapples, a very liigh 

 percentage of the fruit is attacked. 



BUTTERFLIES, MOTHS (LEPIDOPTERA) 



Pale Western Cutworm {Porosagrotis orthogonia Morr.). Th« 

 past season saw the first large decrease in the abundance of this pesl 

 since it came into such prominence as a grain pest in 1919. (See 

 discussion on the pale western cutworm, page 11.) 



Army Cutworm {Chorizagrotis auxiliaris Grote). Some few field 

 of grain in the north central part of the State suffered attack by this 

 cutworm. 



Euxoa pallipennis Smith. In the past two or three years during 

 the time that traps have been set for the moths of the pale western 

 cutworm (Porosagrotis orthogonia Morr.) the moths of Euxoa palli- 

 pennis have been caught in enormous numbers. None of the host 

 plants, however, on which the larvae of this species develop were 

 known until this year when great numbers of them were found feeding 

 on Russian thistle, (Salsola pestifer A. Nels.). As this is the most 

 common weed in northern Montana it is not surprising that E. palli- 

 pennis has been so abundant. As none of this species has been reared 

 from the great numbers of cutworms collected in grain it is doubtful 

 if it ever feeds on an.y of our grain crops. 



Army Worm (Cirphis unipuncta Haw.). A few larvae of this 

 species were sent to the laboratory on September 6th from Waterloo, 

 Montana. 



Striped Morning Sphinx (Celerio lineata Fab.). This insect was 

 exceptionally abundant during the past season. 



Achemon Sphinx (Pholus achemon Drury). The larvae of this 

 insect feeding on vines, and especially Virginia creeper, were trouble- 

 some in towns along the Yellowstone River. 



Imported Cabbage Worm (Pontia rapae L.). This pest was again 

 very abundant and caused much loss to the cabbage crop. 



Five-Spotted Hawk Moth (Protoparce quinquemaculatus Haw.). 

 A pupa of this species found in tlie soil near a hill of potatoes at 

 Vanada was received in the laboratory in October. 



Fruit-Tree Leaf -Roller (Archips argyrospila Walker). See page 16. 



Coddling Moth (Carpocapsa pomonella L.). Bud IMoth (Tmeto- 



