FAM, EMPIDID/E 341 
Basal cells small, sections of the fifth vein proportioned 0.4 : 
0.4 : I, first posterior cell ending at the tip of the wing; 
pollen of the mesonotum cinereous . . . . . . . . P.soccarUs, nov. sp. (r1). 
94. Pleure entirely densely white-pollinose; tarsi yellow . . . . . . . . . - « . « . 985. 
Sternopleura with a glabrous shining spot; front rather 
An tGWI H5 BOPA Heariv parallel sc NE ue M repeto o deest n 99: 
95. Third antennal joint ovate, two-thirds as long as the arista; 
bgsues dianeuboraeevellau s dece e ua se] Nadie uexDeuassrcosp e oce ep ep rr 6c O0; 
Antenne black, the third joint oval, one-third as long as the 
ansta: bredesblack 401. 1 C2 V S017...  . C. P. CALIGATUS, Melander. 
96. Base of abdominal segments fasciate with cinereous pollen; 
third vein nearl]ystraight . |. .,. . . . . . . . P. PULVERULENTUS, nov. sp. (2). 
Abdomen completely shining, or sides of segments with basal 
punnosetnédgles o. o co cuA I ON cS x xoci AE ; L0 
97. Abdomen shining yellow; epistome black; third and fourth 
veins straight and parallel; slender species less than 2 mm. 
esi dic ee As edades ABE Mese cM ul RI c M RE ru SET. 
Abdomen shining black, with lateral pollinose triangles; 
epistome white pruinose; base of antennze yellow; first 
posterior cell narrowed; robust species measuring 3 to 
Hog jw wu Udel s cm Lu P.HOLOSRRICUS, Melander. 
98. Antennzg black; femoralsetule black . . . . . . . . P.murivENTRIS, Melander. 
(i; Platypalpus, soccatus, nov. var. — Male. Length r.4 mm. Black, cinereous pollinose, legs 
entirely yellow, tibial spur equal in length to the diameter of the tibize, base of the antennae yellow, crossveins 
meeting, basal cells small. Head cinereous, its bristles yellow, front rather broad, its sides diverging. together 
with the face white pruinose ; epistome and proboscis black, palpi broadly spatulate, pale yellow, fringed but not 
setose. Thoracic bristles yellow, one pair each of the usual bristles, but the scutellum with a small additional 
lateral pair; sternopleure glabrous except the upper fourth; abdomen shining black, pygidium large, rotund, 
shiniog, not fimbriate. Front femora with short flexor cilia, middle femora with twenty setule in the anterior 
flexor row and twelve black sete in the posterior row, behind which are some short yellow seta, middle tibiae 
nearly as long as their femora.  Veins yellowish, costa but slightly thickened beyond the first vein, its second, 
third and fourth sections proportioned 3.5 : 3 :r, third and fourth veins straight, parallel, crossveins meeting at the 
basal third of the wing, nearly transverse, sections of the fifth vein proportioned o.4 : 0.4 : r, anal crossvein at 
an angle of eighty degrees, anal vein entire, distinct, but very thin, marginal cilia as long as the anterior 
crossvein, 
Female. Last two segments of the abdomen dull gray. 
Type, Moscow Mountain, Idaho, July 6, 1912 (Melander).  Paratype from same locality, July 4, 1:915; 
and two others from Craig's Mountain, Idaho, June 9, 1918 (Melander). 
(2; Platypalpus pulverulentus, nov. var. — Length 2.3 mm. Black, thorax cinereous pollinose including 
the entire pleure, abdomen with pollinose fascie, legs entirely yellow, tibial spur strong, costa not thickened, 
crossveins separated, the posterior oblique. Front narrow, cinereous, face white pollinose over a yellowish ground, 
epistome white over a black ground color, palpi broadly oval, yellow, bare except for two apical white setze, 
proboscis short, black ; antenna short, two-jointed, black the base rufous, last joint elongate ovate, twice as long 
as wide and nearly as long as the arista; one ocellar and two pairs of vertical bristles black.  Bristles of the 
mesonotum blackish, including one humeral, several notopleural, one supraalar, one postalar, two dorsocentral, and 
four scutellar, acrostichals biseriate, but minute, other setule very sparse; pollen of the pleure whiter; the 
pollen of the abdomen including the sides and the bases of the second and following segments. Legs including the 
coxe yellow, the posterior coxa pollinose laterally, lower posterior side of the middle femora with a row of yellow 
sete, middle tibie two-thirds as long as their femora. Second, third and fourth sections of the costa proportioned 
3:1.5: 1, third vein straight, fourth vein undulate, parallel with the third at its very tip, first posterior cell 
widest at its middle, distance between the crossveins equal to the anterior, which is' one-half as long as the 
posterior, sections of the fifth vein proportioned 0.7 : o.9 : 1, anal crossvein gradually attenuated, forming an angle 
of fifty degrees, anal vein uniformly weak, marginal cilia short. 
Two specimens, San Diego County, California, March, 8, 1897, collected by W. M, Wheeler. 
