1914] Migrating Lave of Sciara congregata 95 
A number of the migrating larve taken into the insectary and 
placed in a cage, containing some oak leaf mold into which they 
soon dispersed and fed rather actively for several days. About 
three days later on lifting layers of the mold, I noticed that most 
of the larvee had transformed to delicate yellow pupz. No accurate 
record was made of the time passed in the pupal stage but this 
was probably about two weeks. 
On July 16, 1913, a little over a year after the first observation, 
a second army of the worms was noticed. This was also found 
in the town of Fayetteville, only a few hundred yards from the 
locality where the observation of the previous year was made. 
The army was much smaller than the one noticed last year (1912), 
probably not more than three feet long. 
Some of these larvee were kept and pupated about one week after 
they were transferred to the leaf mold. The adults emerged prob- 
ably two to three weeks later, during my absence. This insect 
proved to be the same one observed last year. Specimens sent 
to Prof. O. A. Johannsen were determined by him as a new species. 
They are described in the present issue of PsycuE under the name 
of Sciara congregata. 
NATURAL ENEMIES OF SIMULIUM: NOTES. 
By F. M. WesstEr, 
Bureau of Entomology. 
In the concluding paragraphs of his paper on “American Black 
Flies or Buffalo Gnats,”? Bulletin 26, Technical Series Bureau of 
Entomology, April, 1914, the author, Mr. J. R. Malloch, calls 
attention to the occurrence of parasites of the larvee found in IIli- 
nois, and also found by Mr. E. H. Strickland near Boston, Mass. 
In the last paragraph of his paper, Mr. Malloch refers to some 
work done by agents of the Bureau of Entomology many years 
ago. As this reference leaves the matter somewhat obscure, it 
may be stated that on May 6, 1888, while studying Simulium in 
the St. Francis River, near Madison, Ark., the writer found a 
Simulium larva about one-fourth grown, presumably belonging to 
what was then known as Simuliwm pecuarum, infested by some 
