420 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



as a control measure. The insect was found in Aquilegia canadensis. 

 Two excellent figures of the work of the larva in the leaves are shown. 



The substance of this article was published by Dr. Britton in Garden 

 and Forest, Vol. VIII, 1895, p. 443, Fig. 61. In this article the insect 

 was noted from the middle of May to October 11. 



A brief note of the presence of the insect at Inwood, New Brunswick, 

 N. J., was published by S. Van R. Strong, Garden and Forest, Vol. X, 

 1897, p. 278.1 



Aldrich's Catalog of North American Diptera, under Phytomyza 

 aquilegia; Hardy, notes the original description by Hardy cited above; 

 larva mines the leaves of Aquilegia vulgaris; also Coquillett Bui. 10 

 N. Ser. Div. 78, giving its distribution as D. C, Conn.; larva mines in 

 nasturtium and columbine. 



Coquillett's article published in 1898 records rearing eight adults 

 from nasturtium, October 1884, others were reared July 1897, and he 

 cites the rearing by Britton, 1894, who submitted his specimens to Mr. 

 Coquillett for determination. Coquillett stated that Phytomyza 

 ancholice Rob. Des., placed in synonymy by Kaltenbach, is also a pest 

 of Aquilegias. 



Melander, "Synopsis of the Dipterous Groups Agromyzinse, Mil- 

 ichiinse, Ochthiphilinse and Geomyzinse," Jour. N. Y. Ent. Soc., Vol. 

 XXI, No. 3, p. 271, records specimens from Illinois and Idaho in addi- 

 tion to the other places recorded in this paper. 



Habit of the Larva 



The columbine leaf-miner was first noticed in the larval stage on 

 May 11, 1914, at the Maryland Experiment Station. These larvse 

 pupated three days later. In view of our present knowledge of the 

 life-history, the eggs must have been deposited on or about the first 

 of May. 



The infestation was light but later spread to practically every plant 

 at the Experiment Station in three widelj^ separated localities. 



The lower leaves are the first to be attacked, the first and second gen- 

 erations confining their attentions almost entirely to them. Later the 

 small leaves around the flower stalks may become infested. 



The larval mine gradually widens out from the beginning taking a 

 serpentine course, frequently crossing upon itself and ending in a spot 

 nearl}"- |-inch in width. The mines are plainly visible on the upper 

 surface as white lines but can be seen only by transmitted light in 

 examining the lower surface. 



1 The author is greatly indebted to Dr. Britton for transcriptions of the two 

 articles in Garden and Forest. 



