EIGHTEENTH ANNUAL EEPORT OF STATE ENTOMOLOGIST 15 



Sugar-Beet Webworm {Loxoste§e stieticalis L.). See page 10. 



Polyphemus Moth (Telea polyphemus Cramer). This beautiful 

 large moth, which feeds in the larval stage on a wide variety of 

 trees and shrubs, was very common in the state this season. 



Pale Western Cutworm (Porosagrotis orthogonia Morr.). See 

 page 5. 



.Noctuids in Cottonwood Bark (Oni/cha gratis rileyana Morr. 

 and Ufeus plicatus Grote). In 1915 we reported Onycha£rotis 

 rileyana as causing damage to cotton wood trees in Silver Bow 

 County by feeding beneath the green bark. Much damage in the 

 same locality was done this year by what was apparently the same 

 species but specimens were not reared through. Ufeus plicatus, 

 doing similar damage, was reared from specimens taken at Melstone. 



FLIES (DIPTERA) 



Ox- Warble Fly (Hypoderma lineata DeV.). This pest, often 

 known as the "heel fly," was reported by farmers in the Centennial 

 Valley to have attacked horses, as regular ox-warble lumps similar 

 to those on cattle were found on the animals' backs. 



Nose Fly (Gastrophilus haemorrhoidalis L.). This pest, which 

 is the most bothersome of all our animal parasites, has now extended 

 its range over the entire state, whereas in 1913 it was known only 

 in the far eastern counties. 



Flesh Flies (Sarcophaga Jcellyi Aldrich), which are the principal 

 natural check on destructive grasshoppers, were present over most 

 of the grasshopper-infested regions in the central and eastern sec- 

 tions of the state. The flies deposit on the hoppers living maggots 

 which, after gaining entrance to the body cavity, feed on the juices 

 and tissues of the hoppers, eventually causing their death. 



Western Wheat Stem Maggot (Hylemyia eerealis Gillette). 

 This insect, which works through the stems of the young plants, did 

 a moderate amount of damage to spring wheat in central Montana. 



BEETLES (COLBOPTBEA) 



Colorado Potato Beetle (Lepthiotarsa decemlineata Say). A 

 remarkable reduction in the number of "potato bugs" was noted all 

 over the state. 



A Sunflower Pest {Chrysomela exclamationis Fab.). For many 

 years known as a common feeder on wild sunflowers, this insect has 

 now transferred its attention to the giant Russian sunflower grown 



