351 
Frons almost parallel-sided, sparsely. hairy, over one third of the 
head-width at anterior margin; orbits narrower than interfrontalia; 
third antennal segment higher than long; genal bristle slender. Meso- 
notum with three or four dorsocentral bristles ; about six series of setulae 
between the dorsocentrals, median setulae not forming stripes except near 
anterior margin. Hypopygium as in Plate XLVII, Figures 7, 11, and 12. 
Veins 3 and 4 distinctly convergent at apices; penultimate section of 
fourth vein about one third as long as ultimate, and longer than last sec- 
tion of fifth vein. 
Length,.2 mm. 
Type, male, allotype, and five paratypes, Carbondale, Ill., July 6, 
1909, reared from larvae from Pemphigus gall. The species is evidently 
predaceous on the gall-maker. 
Specimens emerged as adults July 15 and 27, 1909. 
LeEucopPis PINIPERDA, Sp. n. 
Male and Female.—Black, opaque, densely gray pruinescent. Frons 
unicolorous pale gray pruinescent; antennae and palpi black, second seg- 
ment of former pale gray pruinescent. Thorax not vittate. Abdomen 
slightly shining; basal tergite almost entirely brownish fuscous, second 
less broadly fuscous, the dark parts of tergites more distinctly shining 
than remainder of dorsum; hypopygial forceps testaceous. Legs black, 
bases of mid and hind tarsi and sometimes the knees in male testaceous, 
base of fore tarsus and apices of tibiae pale in female. Wings clear, 
veins fuscous. Calyptrae and halteres yellowish. 
Frons a little over one third of the head-width, with sparse, short, 
erect hairs; orbits almost uniformly wide for their entire length, each 
about half as wide as interfrontalia; ocelli in an almost equilateral tri- 
angle; lunule broadly transverse on its upper margin, nearly bare; third 
antennal segment higher than long; second segment of arista about four 
times as long as thick. Thorax with two or three pairs of dorsocentrals ; 
dorsal setulae sparse, about four series between the dorsocentrals, some 
lying between the posterior pair. Hypopygium small with a very long 
curved central process, as in Plate XLVII, Figure 2. Wing-veins 3 and 4 
almost parallel on their apical portions; last section of fourth vein five 
or six times as long as preceding section, the latter very much shorter 
than last section of fifth vein. 
Length, 1—1.5 mm. 
Type, male, Urbana, Ill., April 29, 1916, in forestry of University 
of Illinois. Allotype, Urbana, Ill, July 5, 1915, on tree-trunk. Para- 
type, male, Boulder, Col., August 19, 1918, reared from needles of 
Pinus scapulorum (E. Bethel). 
The type and allotype were collected by the writer in the vicinity 
of pine trees. The larvae are very probably predaceous on aphids oc- 
curring on pine. 
