FAM. EMPIDID/E 335 
Abdomen shining, or if pollinose, the species disagrees with . 
IDOOPMGE CHR MEN UN ccena de e ROSE MASS AUR TRE eu Ca Le e 70 
70. Middle femora with flexor bristles in addition to two rows of 
ENDO CI ENEMIES e CUu RESI AR WE Se n GR MEL oC RS DRIN Oe onde T 
Middle femora without bristles; antenna black; mouth- 
üpsnming nopumDUSlN Wide LONE QA SR T e UMP ao OP EO GE oi ev T9. 
71. Antennz, palpi and femoral bristles black; mouth-opening 
normal; coxe darkened; epistome polished . . . . . P.rucrATOR, nov. sp. (1). 
Base of antenne yellow; palpi and femoral bristles yellow; 
moüth-opening wide; coxe yellow (P.hiass, Melander) . . . . . . . . . . . . 72. 
72. Face broader than long, epistome pollinose; thoracic bristles 
yellow; halteres yellow . . . . . . . . . . . .. P. HNs, Melander, s. str. 
Face as broad as long, epistome shining; thoracic bristles 
black; halteres blackish. . . . . . . . . . . . var. FUSCOHALTERATUS, Melander. 
73. Third antennal joint pubescent, subulate, over three times as 
long as wide, longer than its arista; coxa more or less 
blackish at the base. middle femora stout and usually with 
a few bristles on the anterior side; costa with a strong 
ib keninpattbbend oFthe MIEL c 20 Sc NUO.A S cR DN e IU vermis e ce es Mo 
Third antennal joint ovate, not more than two times as long 
as wide and shorter than its arista; coxa» and legs yellow ; 
costa motstrongly thickened- . . 1.1 0 s o. P. VENATICUS, nov. Sp. (2). 
(1) Platypalpus luctator, nov. sp. — Male. Length 2 mm. Related to P. A;azs, but having black antennz, 
palpi and bristles, Occipal sete dark, arranged in two sets, two pairs of vertical bristles, ocelli black, front two 
and a half times as long as broad, face twice as long as broad, its ground-color black, epistome polished ; mouth- 
opening normal, proboscis black, palpi of moderate size, decumbent, black and with one apical black hair; outer 
antennal joint ovate, one-half longer than broad and three-fourths the length of the shortpubescent arista. Mesonotum 
with olivaceous pollen, its setule short and not restricted to the central rows, four scutellar bristles; sternopleura 
largely polished; abdomen wholly polished, the scattered pubescence pale, genitalia coarse and rounding the end of 
the abdomen, the right and left claspers enclosing an open space between them. Legs uniformly luteous, the coxa 
darkened basally, front femora rather stout, middle femora with twenty-four small black setule in each row, posterior 
to which are eight black pronounced bristles, middle tibie three-fourths their femora, the terminal spur minute. 
Calypteres, fringe and halteres blackish.  Veins light piceous, the second, third and fourth sections of the costa 
proportioned about 4 : 3 : r, third vein ending at the wing-tip, nearly parallel with the fourth except at the tip 
where it converges toward the fourth, crossveins at two-fifths the wing-length, meeting, sections of the fifth vein 
equal, anal vein uniformly weak and located close to the hind margin, cilia short. 
Holotype, Priest Lake, Idaho; August r, r9g16 (Melander). 
(2 Piatypalpus venaticus, nov. sp. — Female. Length r.8 mm.  Cinereous dusted, legs yellow and 
not setose, crossveins meeting. Head slightly higher than wide, the lower part of the eyes bulging forward, occiput 
cinereous, front narrow, whitish, face and epistome white; palpi white, oval, one-fourth as long as the black proboscis, 
with two basal and one apical white sete; antenna two-jointed, the basal joint brown, the outer joint black, ovate, 
not twice as long as wide and three-fourths as long as its arista; two pairs of brown vertical bristles. Thoracic 
bristles yellow, two humeral, one notopleural, one supraalar, one postalar, two dorsocentral and two scutellar bristles, 
setule very sparse; sternopleural spot large; abdomen shining black. Middle femora short, the tibie three-fourths 
as long as their femora, their apical spur minute. Veins thin and pale, costa not thickened, its second, third and 
fourth sections proportioned 3 : 2.3 : r, third and fourth veins nearly straight and parallel, the first posterior cell 
a little the widest at its apex, crossveins before the basal two-fifths of the wing, meeting, the posterior but slightly 
oblique, more than twice as long as the anterior, sections of the fifth vein proportioned 0.4 : 0.4 : 1, anal crossvein 
forming an angle of forty-five degrees, anal vein very weak, vanishing at its base, marginal cilia as long as the 
anterior crossvein. 
Type from Pullman, Washington, June 16, 1912. Paratypes from Ilwaco, Washington; Avon and Moscow Mountain, 
Idaho (Melander) and from Kaslo and South Fork, British Columbia (R. P. Currie). 
