76 
rTavinfr rccontly made a careful siiuly of the specimens belonjring: to 
this family contained in tlie National Museum collection, which includes 
those bred at the iusectary of this Department and by the writer, the 
records of these rearinj^s are brought together in the present paper, 
and in addition su(!h data as liave been communicated by correspond- 
ents who liave transmitted bred s|)ecimens for names. 
Lvncopis nigrlvornis logger. — This si)ecies was evidently introduced 
from Europe, althougli at the present time it occurs all over this coun- 
try, ranjiin;^ from New llamijshire to Florida and westward to Califor- 
nia. A specimen from France agrees in all points with others from 
this country. The larvae 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 Hies. 
lired February 28, 1871), by Mr. E. A. Schwarz, from larvic found in 
the galls of l*emphigiis transverHus at Columbus, Tex. 
r>red by the writer July to 9, 1883, at Sacramento, Cal., from larva* 
feeding upon aphidids on thistles; the iarva* pupated from June 20 to 
28. Also reared at Los Angeles, Cal., May 21, 1887, irom larvae preying 
ui)on aidiidids on willows. 
Issued July 18, 1883, from larvne feeding upon aphidids on a cherry 
tree at Boscowen, N. H. Also issued July 8, 1888, from larva* feeding 
upon the same kind of aphidids. 
Issued March 14, 1884, from larva' in galls of PemphUjus hursarius 
received March 11 from J. Lichtenstein, Montpellier, France. 
Issued July 12 and 13, 1880, from larv;e preying upon Siphonophora 
arena' on wheat collected June 26 by F. M. Webster, at Vincennes, Ind. 
Leticopis simplex Loew. — Issued August 9, 13, and IG, 1883, from hirva? 
in galls of Phi/lloxera rififoUw collected July 30 by ^Ir. T. Pergande, in 
N'irginia. Also August 11, 18!>1, from galls of the same insect received 
from C. A. Davis, Alma, Mich. Also bred in .Inly, JSOO, from galls of 
this insect by T. A. Williams, Fremont, Nebr. 
Issued May 14, 1807, from larva' preying upon Chermes phiicorticis, 
collected May 11 by Mr. T. Pergande, at AVashiugton, D. C. 
Leucopis helJa Loew. — Issued in May, 1880, from larva' 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, 1802, from larva* preying ui>on a 
species of coccus on Opuutia sp. collected by 'Sir. C. K. Orcutt, San 
Diego, Cal. Also May 11, 180(), from larva' preying on this Coccid 
received January 27 from C. 11. T. Townsend, who collected them at 
San Antonio, Tex. And November T), 180G, from larva' preying upon 
the above-mentioned Coccid, received September 21 from S. A Pease, 
San P>ernardino, (^al. 
liCared by the writer .Tune 17, 1SS7, from larva' preying on a species 
