1924] Notes on Muscina pascuorum Meigen During 1923 17 
NOTES ON MUSCINA PASCUORUM MEIGEN DURING 
1923. 
By Charles W. Johnson. 
Boston Society of Natural History. 
The sudden occurrence, and in great numbers, of Mucina 
pascuorum in North America in 1922, was recorded by the writer 
in Psyche, Vol. 30, p. 1-5, Feb., 1923. 
Early in 1923 very few specimens were seen. Mr. A. P. 
Morse took a specimen Jan. 18 at Wellesley, Mass. The most 
interesting recorded is that from Bridgeton, N. J., where Mr. 
F. M. Schott captured a specimen under bark, Feb. 11. This, 
so far, is the most southern record for the species. Specimens 
were also taken under bark, at Annandale, N. J. March 7, by 
parties scouting for Gypsy Moth eggs. The locality is about 
20 miles west of Bound Brook, where it was previously recorded. 
A specimen was taken in a window at Brookline, Mass., March 
3. Having stated to Mr. F. W. Walker that it would be in- 
teresting to see how the fly had stood the winter, Mr. Walker 
visited the locality where they were so abundant, and in a letter 
says: — “I am sending a box of flies taken April 10, 1923, at 
Asbury Grove, Hamilton, Mass., on the same skylight that I 
collected from Nov. 9, 1922. A few scattering ones were taken 
on other windows.’’ The box contained 125 M. pascuorum, 93 
Pollenia rudis, 7 Phormia regina and 6 Muscina assimilis. 
None were observed during the late spring and summer, but 
early in September, Mr. L. W. Swett, brought me a number of 
flies that had accumulated in the globe of an arc light at the 
Glen House, at the foot of Mt. Washington, N. H. Among 
these was one M. pascuorum the most northern record for New 
England. A few specimens were received from Attleboro, Mass., 
Oct. 14 and Worcester, Nov. 2. Two were collected on windows 
at Brookline, Oct. 28 and Nov. 4 and one on a window in Boston 
Dec. 3. Mr. Walker informs me that appararently the fly was 
not seen at Asbury Grove this fall. 
