.TrrrvAr/-\T /"»/"! TOm i to -^ 



THIRTEENTH ANNUAL REPORT OF STATE ENTOMOLOGIST 1.33 



most destructive insect of the year and is more fully discussed else- 

 where in this report. 



Mourning Cloak Butterfly {Envcniessa antiopa L.). The spiny 

 caterpillars of this species were abundant in many parts of the State 

 and were frequently sent in with the report that they were feeding 

 on elm and willow foliage. 



Noctuid working- in cottonwood bark {Porosaorotis rileyana). 

 The lar\a of this species produces an unusual type of inj\iry as it 

 feeds upon the green bark of the cottonwood tree. It was sent in 

 from Silver Row County. 



Army Worm (Leiu-ania iniijnincta Haworth). The notorious 

 army worm which caused such widespread damage in 1914 in the 

 East, was found in Montana for the first time this season. It was 

 highly injurious to oats in the one locality in which it appeared. 



Polyphemus Moth {Telea pohjpJieiniis Cramer). This showy 

 moth is apparently working westward. It was taken for the first 

 time in Montana at Huntley in 1914 and in 1915 it was sent in from 

 Columbus and Bozeman. 



Red Humped Caterpillar (Schiziu-a concinna S. & A.). Spec- 

 imens of this species were sent in from western Montana where 

 they were said to be injuring fruit trees. 



DIPTERA 



Lip Bot Fly {CrostToj^Tdhis haenujrThordalis Linn.). This species 

 which was reported as far west as Billings in 1914 was taken during 

 the past season in Yellowstone I'ark and in Sixteen Alile Canyon. 

 At both places it was said that it had never been troublesome in 

 previou,-; vears. 



Mosquitoes {('nlicidac). Because of recent popular demand for 

 information concerning mosquitoes, this important group of insects 

 was gi\-en special attention in 1915. Studies of the life history and 

 methods of control were carried on at several points and collections 

 of larvae and adults were made wherever possible. From the results 

 of our studies, it appears that the following species are the most 

 important from an economic standpoint: Aedes sijlvesti-i^, A. s])n)<'("i, 

 A. Ill o'Toniiicif his, A. ciirrici, A. jnilJotiis and Ciilc.x tfirsaJis. 



Wheat Stem Maggots. Consideralile injury to winter wheat was 

 caused by dipterous maggots mining in the leaves and in the sheath. 

 A study of this class of pests showed that at least three species were 



