162 Forty-ninth Report on the State Museum 



Distribution. 

 It is not uncommon in the State of New York, but occurs locally, in 

 various portions of it. Prof. C. M. Weed represents it as very generally 

 distributed throughout Illinois, being common in nearly all the orchards 

 and nurseries examined by him. He has also recorded it from Kentucky, 

 Michigan, and Pennsylvania. Lord Walsingham has received it from 

 Texas. It was also found by Prof Frey, in Germany, in 1871, within 

 the leaves of apple trees imported from this country. 



Food-Plants. 

 This insect is not restricted to the apple for food, but has also been 

 observed mining the leaves of different species of Cratcegus, the sweet- 

 scented crab, blackberry, raspberry, and dewberry [Rub'us Canadensis). 

 and will doubtless be found on others of the Rosacese. 



Remedy. 

 If this species should ever become annoyingly abundant a simple and 

 effective remedy would be gathering the fallen leaves from beneath the 

 trees that have shown in the autumn indication of the attack and burn- 

 ing them. 



Cecidomyia betulse (Winnertz). 



The Birch-seed Midge. 



(Ord. Diptera : Fam. CECiDOMViDiE.) 



Winnertz: in Linnaea Entom., viii., 1853, p. 234 (original description), 

 LoEW, F. : in Verh. Zool. Bot. Gesell. in Vienna, 1878, pp. 15-17, Taf. 



iv., fig. 4 (figures gall; corrects description). 

 Wachtl : in Entomol. Biolog. Studien, Serie i, 1878, pp. g-ii (found 



on a Swedish var. of Betiila pendula, viz., valecardia). 

 Lintner: in Country Gent., li., 1886, p. 287 (discovery recorded); the 



same in 3d Rept. Ins. N. Y., 1886, pp. 85-86, 141, 143; 4th 



do., 1888, pp. 27, 205, 206 (parasites of). 

 Trail: in Scottish Naturalist, 1888, same in separate, as. Gall-making 



Diptera of Scotland, p. 31 (mention). 

 Theobald: British Flies, 1892, p. 63 (brief account). 



Catkins of the white birch infested with footless, orange-red larvae 

 were communicated by Mr. W. H. Payne, Albany, N. Y., on March 25, 

 1886, and a little later the same insect was found by me infesting the 

 catkins of birch in Washington Park. In the following October the 

 larvae were so abundant in Washington Park that of several white birches 



