i 
FAM. EMPIDID/E 329 
5o. Spur of the middle tibi: as long as the diameter of the tibize, 
base of the hind femora pale, anterior femora with flexor 
Ba 0 s MN eU. i ieitascc o ne vi» cor cx: DIVERSIPES, CCOquUIllett. 
Middle tibiz without spur; hind femora entirely blackish, ; 
fanbra noOUCcHNMUO 0 oO uv VAI iS c uin. PI DIREPTOR, HDV.. SD. 
51. Middle femora without flexor sete and with r5 setule in 
posterior row ; front narrow; pleure shining; third antennal 
joint slightly shorter than arista; bristles yellow . . . . P. NITIDIPLEURA, nov sp. (1). 
Middle femora with flexor sett and with about 20 or more 
posteo SUE EDO DIBdd- UN NI ete tI Iu p I reU UV oe us d Dd. 
52. Third joint of the antenne three times as long as broad, 
subequal to its arista; bristles brown; pygidium rather 
large and vertical; upper pleure pollinose. . . . . . P. BrcomNirs, nov. sp (2). 
Third antennal joint oval, much shorter than itsarista ; bristles 
black; pygidium minute and globular; pleure shining. . P. PupENs, nov. sp. (3). 
(1) Platypalpus nitidipleura, nov. sp. — Female. Length 2 mm. Entirely polished black, legs yellow, 
the hind femora apically dark; crossveins contiguous and transverse; antenna black, the third antennal joint long, 
subequal to the arista. Head globular, polished, vertical bristles black; front narrower than the width of the basal 
antennal joint, its sides parallel; face narrow, its lower half gray pruinose, epistome shiny; third antennal joint two 
and one half times as long as broad; proboscis black, palpi white, ovoid, rather pointed, with a pair of marginal 
white setze. Notum nearly bare, its bristles yellowish, only a faint trace of pollen along notopleural suture and on 
metanotum. Abdominal hairs fine and very sparse; terminal segments not dusted Front tarsi uniformly dusky, 
postorior tarsi dusky beyond base; about fifteen pronounced setulz in posterior row of middle femora, but no flexor 
setze; middle tibia three-fourths length of femora, the apical spür not developed. Halteres white. Wings hyaline, 
veins yellow at base, otherwise black and thin, costa rather pronounced beyond end of first vein, third and fourth 
veins straight, slightly diverging, third vein ending distinctly before wing-tip, sections of third vein r : 25, of the 
fourth vein, 2 : 3: 6, cilia of hind margin short. 
A single specimen taken in a cottonwood thicket two miles south of Gardiner, Montana, in the Yellowstone 
Park, August 17, 1919 (Melander). It is related to bicormis and fudems, but is quite distinct. 
(2) Platypalpus bicornis, nov. sp. — Length 2 mm. Black, shining, the upper half of the pleurz sericeous, 
legs brownish, spur of the middle tibie minute, front broad, antenna  porrect, crossveins meeting. Head wider 
than deep, occiput and face subshining, front and epistome polished; palpi elongate oval, yellowish, with a single 
apical seta; basal joint of the antenna minute, third joint subulate, over three times as long as broad, slightly 
longer than the pale-tipped arista; one pair each of black vertical and ocellar bristles. ^ Mesonotum nearly bare, 
only four pairs of weak acrostichal setule, notopleural suture, scutellum, metathorax, and upper half of the pleurz 
sericeous; one pair each of the usual thoracic bristles; abdomen shining, including the genitalia, ovipositor compressed, 
pygidium rather large and erect. Base of posterior coxa blackish, posterior femora infuscated apically, the hind 
ones darkest, front femora not ciliate beneath, but densely and finely pubescent instead, middle femora not bristly 
in front, posteriorly with four long yellow bristles, tarsi biackish apically. ^ Veins blackish, costa slightly swollen 
at the end of the first vein, its second, third and fourth sections proportioned 4 : 2.6 : r, third and fourth veins 
straight and parallel, crossveins meeting on the basal third of the wing, nearly transverse, sections of the fifth vein 
proportioned o.3 : 0.5 : 1, anal crossvein forming an angle of fifth degress, base of the anal vein wanting, marginal 
cilia short. 
Twenty-eight specimens, type from Bellingham, Washington, July 29. Paratypes from Brinnon, Everett, Granite 
Falls, Index, Lake Cushman, Lilliwaup, Quilcene, Tacoma and Tulalip, all in Washington (Melander). 
(3) Platypalpus pudens, nov. sp. — Male. Length 1,5 mm. Black, shining, bristles black, legs dark 
testaceous, posterior coxa and distal two-thirds of the hind femora blackish, tibial spur minute, front very broad, 
third antennal joint short ovate, crossveins meeting. Head wider than deep, occiput and face subshining, front and 
epistome polished; palpi small, elliptical, blackish, with one apical dark seta, proboscis short; antenne two-jointed, 
the outer joint scarcely longer than broad, less than one-half as long as the arista; two pairs of vertical and one 
of ocellar bristles, long. . Mesonotum nearly bare, but three pairs of acrostichal setule present, humeral bristles 
small, one pair each of notopleural, supraalar, postalar, dorsocentral and scutellar bristles; pleure polished, the 
metapleure and scutellum alone sub-pollinose; abdomen shining, pygidium minute.  Femora not ciliate, middle 
iemora with four stiff black setze in back of the second row of setule, last tarsal joints blackish, ^ Veins pale, costa 
