42. BULLETIN NO. 64. 



they are not easily detected. The remedy is Paris green or Helle- 

 bore applied to the leaves. See previous Reports for proportions. 



THE NATIVE CURRANT SAW-FLY, Gjmnonycbus appendic- 

 ulatus Hartig. Family Tenthredinid.^, Order Hymenoptera. 



This insect is very injurious to gooseberry and currant foliage 

 in Montana each year. This season it was very abundant in 

 the middle and eastern portions of the state and in many cases the 

 foliage was entirely taken. The slugs or larvae are green in color 

 and are thereby easily distinguished from the imported species in the 

 the same family and of similar habits, which, in the larval stage^ is 

 green dot^ d with black. 



LEAF MINING BEETLE OF POPULUS, Odontota. Family 

 Ch RYSOMELiD^, Order Coleopteea. 



In years past we have on a number of occasions been supplied 

 with specimens of a larval beetle, probably belonging to the genus 

 Ondontota, which feeds very abundantly on the leaves of cotton- 

 wood (Populus deltoides) in the Yellowstone Valle3^ While in 

 Billings and vicinity on various occasions during the season, this 

 insect was found in great abundance but never in the adult stage. 

 Repeated attempts at breeding the insect have proved unsuccess- 

 ful and we are therefore uninformed as to its specific identity. The 

 larva feeds within the leaf, mining out a large cavity which causes 

 the affected part of the leaf to turn black. Many trees, by reason 

 of the large number of injured leaves, presented a distinctly black- 

 ish ireneral cast. 



&' 



THE SPOTTED BLISTER-BEETLE, Epicauta maculata Say. 

 Family Meloidae, Order Coleoptera. 



Members of the family Meloidae are often mentioned as 

 common and moderately injurious in the United States and in Mon- 

 tana. Though there are many representatives of this family, 

 Epicauti maculata in much more often complained of than any 

 other. It occurs throughout the state and is very abundant. Dur- 

 ing the year now closing it has been reported from various sections, 

 and in our work in the Yellowstone Valley we have found it very 

 common in sugar-beet fields. In one of the Experiment Station s 



