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_ Having recently made a careful study of the specimens belonging to 
this family contained in the National Museum collection, which includes 
those bred at the insectary of this Department and by the writer, the 
records of these rearings are brought together in the present paper, 
and in addition such data as have been communicated by correspond- 
ents who have transmitted bred specimens for names. 
Leucopis nigricornis Egger.—This species was evidently introduced 
from Europe, although at the present time it occurs all over this coun- 
try, ranging from New Hampshire to Florida and westward to Califor- 
nia. A specimen from France agrees in all points with others from 
this country. The larve prey upon various kinds of plant lice by cap- 
turing them and sucking out their juices. When fully grown they 
seldom wander far from their feeding grounds, but attach themselves 
oy a viscid substance and soon contract into puparia, after the manner 
of many kinds of syrphus flies. 
Bred February 28, 1879, by Mr. E. A. Schwarz, from larve found in 
the galls of Pemphigus transversus at Columbus, Tex. 
Bred by the writer July 6 to 9, 1883, at Sacramento, Cal., from larve 
feeding upon aphidids on thistles; the larvee pupated from June 26 to 
28. Also reared at Los Angeles, Cal., May 21, 1887, from larve preying 
upon aphidids on willows. 
Issued July 18, 1883, from larvee feeding upon aphidids on a cherry 
tree at Boscowen, N. H. Also issued July 8, 1888, from larvee feeding 
upon the same kind of aphidids. 
Issued March 14, 1884, from larve in galls of Pemphigus bursarius 
received March 11 from J. Lichtenstein, Montpellier, France. 
Issued July 12 and 13, 1889, from larve preying upon Siphonophora 
avence on wheat collected June 26 by F. M. Webster, at Vincennes, Ind. 
Leucopis simplex Loew.—Issued August 9, 13, and 16, 1883, from larvee 
in galls of Phylloxera vitifolie collected July 30 by Mr. T. Pergande, in 
Virginia. Also August 11, 1891, from galls of the same insect received 
from C. A. Davis, Alma, Mich. Also bred in July, 1890, from galls of 
this insect by T. A. Williams, Fremont, Nebr. 
Issued May 14, 1897, from larve preying upon Chermes pinicorticis, 
collected May 11 Di Mr. T. Pergande, at Washington, D.C. 
Leucopis bella Loew.—Issued in May, 1889, from larvee preying upon 
a species of Eriopeltis on swamp grass in Nova Scotia, received from 
Dr. James Fletcher, Ottawa, Canada. 
Issued February 23 and March 1, 1892, from larvee preying upon a 
species of coccus on Opuntia sp. collected by Mr. C. R. Orcutt, San 
Diego, Cal. Also May 11, 1896, from larvie preying on this Coccid 
received January 27 from C. H. T. Townsend, who collected them at 
San Antonio, Tex. And November 5, 1896, from larve preying upon 
_ the above-mentioned Coccid, received September 21 from S. A Pease, 
San Bernardino, Cal. 
Reared by the writer June 17, 1887, from larvee preying on a species 
Bai 
