THIRTEEXTH AXXUAL REPORT OF STATE EXTOMOLOGIST lo3 



most destructive insect of tlie ycai- and is nKire fully discussed else- 

 where in this report. 



Mourning Cloak Butterfly ( Kiivanessa antlopa L.j. 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 foliai^e. 



Noctuid working' in Cottonwood bark { I'orosn <Jrntis rUrt/mifi ). 

 The larva of this species produces an unusual type of injury as it 

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

 from Siher Bow County. 



Army Worm ( fA-ucaiiid iniipKucfa Ha worth). The notorious 

 army worm which caused such widespread damage in 1011 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 (Ti'lca poh/pliennis Cramer). This showy 

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

 time in Montana at Huntley in 1014 and in 191o it was sent in from 

 Columbus and Rozeman. 



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

 imens of this species v\-ere sent in from western [Montana where 

 they were said to l^e injuring fruit trees. 



DIPTERA 



Lip Bot Fly (frosfj-ojjJuhis haeinorrhordaU:^ Linn. ). This species 

 which A\ as reported as far west as Piillings in 1914 was taken during 

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

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

 previous vears. 



Mosquitoes {('itJicifhfc). r)ecause of recent popular demand for 

 information concerning mosquitoes, this important group of insects 

 was given special attention in 101.5. Studies of the life history and 

 methods of control Avere 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: .ledes sj/Jj-rsfj-ix, ,/. sjirjicfi, 

 ,1. iii oroDKiciiliis. ./. ciiTi-'u'i . ./. piilhifii!< and Citlcv fdi-xnlix. 



Wheat Stem Maggots. Considerable injury to winter wheat was 

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

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



