FAM. EMPIDID/E 339 
Femora luteous; arista longer than third antennaljoint . . . . . . . . . . . . . 88. 
88. Epistome pollinose; tarsi annulate; middle section of fifth 
vein longer than the ultimate; Q abdomen with pollinose 
EM MUI Mu ed: oco P. TRNASo BOY; ép. (1). 
Epistome shining; tarsi gradually darker toward tip; last two 
sections of fifth vein subequal; abdomen shining . . . P. RECURVUS, nov. sp. (2). 
89. Btristles black; coxe dark, middle femora robust . . . . . . . . . «- « « «.. «90. 
Buses. yellow; arist4 slegder: legs veliow- cos s eto hee xU e 9I. 
9o. Third antennal joint much longer than arista; middle femora 
with five black thorns on anteriorface . . . . . . . P. vuLNiFICUS, nov. sp. (3). 
robust, front femora ciliate as usual, front tibize stouter than the hind ones, middle femora with about eighteen 
setule in each flexor row, the hairs rather outstanding but none distinctly setiform, middle tibize five-sixths the 
length of their femora, tarsi apically dusky. ^ Halteres, calypteres and root of wings yellow, veins thin and brown, 
wings three times as long as wide, basal cells large, third vein uniformly curved ending beyond the tip of the wing, 
fourth vein sinuous, first posterior cell widest at its middle where it occupies somewhat more than one-third the 
width of the wing, sections of the costa proportioned ro : 6 : 4 : zr. of the fourth vein, r : zr, of the fifth vein, 
2:44:93, anal crossvein almost perpendicular, base and tip of the anal vein lacking. 
Four specimens, from shrubbery, near Adna, Washington, July ro, 1917 (Melander). 
(1i) Platypalpus tenax, nov. sp. — Male. Length 2.3 mm. Black, legs yellow, mesonotum completely 
covered with golden pollen, bristles black, crossveins transverse, contiguous, located at the middle of the wing, first 
posterior cell widest at the middle. Upper occiput with olivaceous pollen and a double row of dark sete, lower 
occiput with gray pollen and hairs, front olivaceous pollinose, face and epistome white; proboscis black, palpi rather 
small, oval and yellow; antennae black, the third joint hairy, lanceolate, over twice as long as wide and three-fourths 
the length of the arista. Humeral bristle small, posterior dorsocentral and middle scutellar bristles strong, dorsocentral 
setulae distinct. Abdomen shining, the hairs fine, long and pale, pygidium not much larger than the diameter of the 
abdomen, its left dorsal valve with a close fringe of yellowish hairs. Legs robust, including the coxz yellow, the tarsi 
narrowly annulate, front femora with a dozen fine pale flexor cilia, about twenty-four setule in each flexor row of the 
middle femora, posterior to which are about a dozen irregular yellow sete, middle tibiz setulose within, five-sixths as 
long as their femora, the black-tipped acute spur long. Roots of halteres and of wings, and the calypteres yellow, 
wings three times as long as wide, veins thin and blackish, sections of the costa proportioned about7:5:3: 1, of the 
fourth vein, 7 : 8, of the fifth vein, 3 : 4 : 3, third vein gently bowed, ending just beyond the wing-tip, fourth vein 
conversely bowed, the first posterior cellat its middle occupying about one-third the width of the wing, anal crossvein 
straight, almost perpendicular, anal vein faint, anal angle moderate. 
Female. Abdominal segments with faint basal bands of yellow pollen. 
One pair, Ilwaco, Washington, July 15, 1917 (Melander). 
(2) Platypalpus recurvus, nov. sp. — Female. Length 3 mm, Front cinereous, its sides slightly 
diverging above, face white-pollinose, epistome black, palpi ovate, half as long as the proboscis, yellow, the exterior 
side white pruinose, a single apical white seta, proboscis black; antenne three-jointed, black (in one specimen the 
antenne are yellowish at the base), the last joint elongate-oval, twice as long as wide, its arista nearly twice as 
long as this joint; one pair each of black ocellar and vertical bristles. — Pollen of the mesonotum rather dense, 
yellowish, nearly coating the black ground-color, bristles yellow, the humeral small, one notopleural, one supraalar, 
one postalar, two dorsocentrals, four scutellars; pleure more densely white pruinose, with a large sternopleural spot; 
abdomen shining black, with visible subdorsal pits. Legs including the coxa testaceous, front femora with twelve 
flexor cilia, middle femora setose in front and back, middle tibia three-fourths as long as their femora, their spur 
strong, acute, black, tarsi dusky, more pronounced at the apex of the joints. Wings a little dusky, veins strong, 
costa swollen at the end of the first vein, its second, third and fourth sections proportioned 5 : 3 : 1, third vein uniformly 
recurved, terminating beyond the tip of the wing, first posterior cell widest at its middle, posterior crossvein oblique, 
more than three times as long as the anterior, located just before the middle of the wing and half the length of the 
anterior crossvein beyond that vein, sections of the fifth vein proportioned 0.8 : 1.2 : 1, anal crossvein nearly per- 
pendicular, base of the anal vein indicated only as a slight fold, 
Three specimens, Palo Alto, California, April 3, 1906, collected by Dr. J. M. Aldrich. Another female, from 
Eagle Creek Forest Reserve, near Portland, Oregon (Melander), differs in having the posterior crossvein transverse and 
meeting the anterior. : 
(3, Platypalpus vulnificus, nov. sp. — Female. Length 3.2 mm, Body black, legs yellow, antenne 
elongate, mesonotum pollinose, bristles black, tibial spur strong, middle femora with spinous bristles on the anterior 
face, crossveins meeting. Front pollinose, rather broad, its sides divergent above, face twice as long as broad, with 
dark pollen, epistome shining, proboscis black, palpi rather short and stout; antenna black, the outer joint tapering, 
four times as long as wide and one-third longer than the arista, Mesonotum with olivaceous pollen, with black setulae 
