NEW YORK STATE MUSEUM 99 



cerning the life history of this insect. The original description 

 appears in Psyche, 22:95, 1915. 



Chrysanthemum midge (Diarthronomyia hypogaea 



F. Lw.). Badly infested plants were received under date of Sep- 

 tember 6, 192 1 from L. F. Strickland, agent of the Department of 

 Farms and Markets, Lockport. Mistletoe was the variety of chrys- 

 anthemum affected and the probabilities favored serious injury. It 

 also came to hand October 21st from J. James de Vyver, Oneonta, 

 accompanied by the statement that it had appeared recently in a 

 local greenhouse. This pest was very abundant last year in an 

 Albany greenhouse. This, in connection with its known occurrence 

 here and there from the Atlantic to the Pacific coast, indicates a 

 wide and probably more general distribution than has been sus- 

 pected. It is undoubtedly carried by shipment of infested plants. 

 It multiplies freely under greenhouse conditions upon certain 

 species of chrysanthemums and may cause very serious, if not total 

 loss in certain varieties. This midge occurs or breeds in Chrys- 

 anthemum leucanthemum, C. corym bosum, C. 

 atratum, C. japonicum and C. myconis in Europe, the 

 first named at least being deformed as seriously as the cultivated 

 chrysanthemum in this country. Most cultivated chrysanthemums 

 appear to be susceptible, and owing to the apparently local habits 

 of the midges, the infestation is apt to be very uneven. 



Observations 1 in Ottawa, Canada, indicate that the following 

 varieties are freely attacked: Chrysolora, Naomah, Radoelii, 

 Ramapo, Hortus Tulsoms, Mrs Clay Frick, December Gem, Madam 



G. Rivol, Dr Enguehardt, Anna, Pacific Supreme, Early Snow, 

 Elberon, Ursula Griswold, Aesthetic and Etherington. The 

 Blended varieties of Chrysanthemum indicum. and C. 

 m o r i f o 1 i u m , such as Bob Pulling, Gertrude Peers, Daily 

 Mail, Oconta, Mrs. G. C. Kelly, Wood Mason, F. T. Quilleton, 

 and E. T. Ouittington were fairly free from injury. 



In Victoria, B. C, greenhouses: Smith's Advance, Halliday, 

 Ivory, Polepheum, Chrysolora, Bonnafon, Wm. Turner, Western 

 King, Mrs Thompson, Englehart and various Pompons were 

 infested, Smith's Advance, Ivory, Bonnafon, Wm. Turner, Western 

 King and Englehart being practically ruined. 



The damage is caused by a small reddish midge about one- 

 fifteenth of an inch long, which deposits its eggs 2 ranging in num- 



1 IQ17 Gibson, A., Ent. Soc. Ont. 47th Rep't 1916, p. 118-20. 

 2 Guyton, T. L., Econ. Ent. Jour., 12:162-64. 1919. 



