44. BULLETIN NO. 64. 



THE OYSTER SHELL BARK-LOUSE, Lepidosaphes ulmi 

 Linn. Family Coccid^. Order Hemiptera. 



This pest of the apple continues to be a prevalent and trouble- 

 some one. It is quite abundant in the western part of the state and 

 is spreading slowly. This insect appears to be more prolific and 

 injurious in Montana than, in the writer's experience, in the East. 



THE WILLOW SNOW SCALE, Chionaspis salicis-nigrse Walsh 

 Family Coccid^. Order Hemiptera. 



From our present knowledge it appears that only a remarkably 

 small number of true scale-insects are native to the state of Montana. 

 This species is the only member of its genus we have found. It was 

 sent in during the summer by Mr. D. D. Magone of Thompson, 

 thickly incrusting a piece of alder stem. It is of no great economic 

 importance but it is of interest because of its close resemblance to 

 the scurfy scale of apple, pear, currant, etc., which is of considerable 

 importance but which has not yet been reported from Montana. 



THE WHITE WINGED MARCH FLY, Bibio albipennis Say. 

 Family BiBiONiD^. Order Diptera. 



In a number of instances fruit growers have found this fly on 

 their trees in considerable number in the Spring and we have r-^ 

 peatedly received specimens at the Experiment Station. The in- 

 sects are slow at flight and cling to the foliage, grass or other objects 

 on which they rest; in a clumsy fashion. The body is dark colored, 

 contrasting strongly with the wings which are milky white. The 

 larvae feed on decaying organic matter in damp places. Neither the 

 larvse nor the adults are believed to be in the least injurious. This 

 species was found in great numbers on currant bushes when in 

 bloom on the Station farm during the middle of May. 



Euthrips tritice. Order Physapodo. 



This widespread minute insect was sent to us by the T. C. Pow- 

 er Co. of Helena, who had received specimens on alfalfa blossoms 

 from a grower in the northern part of the state who had put in a 

 large crop for seed purposes. It was reported with the sending that 

 from the outlook the crop would be almost a complete failure. From. 



