REPORT OF THE STATE ENTOMOLOGIST I913 41 



on March 14th, one larva and a pupa were placed in a tumbler with 

 a little sand and on the 3d of April a midge issued. It is possible 

 that this period marks the duration of the pupal stage. 



Description. The larva is about one-eighth of an inch or 3 mm 

 long, rather stout, deep red and with a well-developed bidentate 

 breastbone. 



The midges are delicate, dark reddish brown flies, the male having 

 a length of about 1 mm, the female 2 mm. Technical descriptions 

 of both sexes have been published by the author. 



Remedial measures. This pest appears to have been controlled 

 by thorough and repeated fumigation with hydrocyanic acid gas, 

 during a period of about three months, beginning March 1st and 

 continuing until the weather became so warm that the ventilators 

 of the greenhouses were kept open. Dr A. B. Stout has kindly 

 given me the following summary of the treatment : " The green- 

 house was closed about 5 o'clock, three stone jars containing 175 

 cc of 25 per cent sulphuric acid (1 part acid of 1.84 specific gravity 

 to 3 parts water) were placed at equal distances in the greenhouses. 

 In each of these was dropped a paper bag containing 45 gramms of 

 potassium cyanide, 60 per cent strength. These bags were dropped 

 in quickly, the doors securely closed and the fumigation continued 

 until the next morning, and the greenhouse was thoroughly ven- 

 tilated for a few minutes. The house contained about 1600 cubic 

 feet, hence the treatment was about one-third the strength usually 

 recommended for fumigation." It was stated that not only did the 

 fumigation destroy the midges, but it appeared to have a paralyzing 

 influence upon the larvae lying upon the surface of the soil and 

 they seemed unable to survive the daily treatments. The cacti 

 showed no ill effects and an examination of the plants as they were 

 brought in this fall, indicated entire or nearly entire freedom from 

 this midge. 



Bibliography 



1910 Felt, E. P. Ent. News, 21:10-12 (Cecidomyia). 



191 1 Econ. Ent. Jour., 4:464. 



1912 Hunter, W. D., Pratt, F. C. & Mitchell, J. D. U. S. Dep't Agric, 

 Bur. Ent., Bui. 113, p. 45, 57 (Cecidomyia). 



BANDED GRAPE BUG 



Paracalocoris scrupeus Say 



A new pest of the grape apears to be developing in the western 



part of the State, since the young of this species have been found 



by Mr L. F. Strickland, damaging fruit of Campbell's Early and 



Worden grapes in the Niagara district. 



