25 
Eedescribed from thirty-one male and female specimens reared by 
the writer from Schizoneura lanigera, at Washington, D. C, February 15 
and September 20, 1879 (previously reared from the same species by 
Haldeman in Pennsylvania, Walsh in Illinois, and Eiley in Missouri); 
by F. M. Webster from Glyphina eragrostidis, at La Fayette, Ind., Sep- 
tember 6-10, 1885 ; by the same observer from Aphis brassicce, on tur- 
nip; by T. A. Williams, at Lincoln, Neb., from Pemphigus fraxinifolii, 
June 10, 1890; and by the same observer from Aphis monardce at 
Ashland, Nebr., May 24, 1890. Mr. Ashmead's specimens, which he 
described under the name of Blastothrix rosw, were reared from Siphon- 
ophora roscc in April, 1881, at Jacksonville, Fla. 
Aphelinus flaviceps n. sp. 
Male. — Belongs to the same group as A. mali, which it resembles in 
the proportions of the autennal joints and in the hairy eyes. It is a 
species of the same general size, and differs from A. mall in the follow- 
ing particulars: The pile of the head is much less conspicuous, and is 
yellowish instead of black ; the mesoscutum is more or less thickly punc- 
tate, the punctures being arranged in rows; the mesoscutellum is more 
coarsely, though still finely, shagreened ; mesopleura plainly shagreened 
over entire surface, not smooth on basal half; hind coxa> granulate. 
Entire thorax black ; entire head uniform orange-yellow, except occiput, 
which has a dark transverse streak. Abdomen dark in the middle 
above; for the rest concolorous with head. All legs and an ten me uni- 
form orange-yellow. Wings hyaline, veins light, the cilia at proximal 
border of hairless streak larger than those at apical border (more than 
twice as long and much stouter); they are irregularly placed, and on 
the lower half of the wing form approximately two rows. 
Described from one male specimen collected in the Santa Cruz Moun- 
tains, California, by A. Koebele, in May. Probably parasitic on some 
Aphidid. 
Aphelinus mytilaspidis Le Baron. 
Aphelinus mytilaspidis Le Baron. American Entomologist, vol. n (1870), p. 360. 
Female. — Length, 0.04 mm.; expanse, 1.28 mm.; greatest width of 
fore-wing, 0.22. Eyes naked; pedicel of antennas one and a half times 
as long as thick, club twice as long as penultimate joint ; thorax smooth, 
impunctate; abdomen ovate, as wide as thorax. Cilia at proximal 
border of hairless streak of forewings larger than those at apical border, 
but hardly twice as long. There are at least seven irregular rows, and 
they extend back nearly to base of wing, with slight interruption at 
two-thirds distance from tegula to hind border of hairless streak. Gen- 
eral color bright lemon-yellow; scape of pedicel and sometimes funicle 
joints 1 and 2 of antennas dusky; eyes blackish, ocelli carmine, mandi- 
bles brown, all legs yellow, wing veins bright yellow; wings perfectly 
hyaline. 
