FAM. EMPIDID/E 319 
Anterior femora brown, hind femora black, none of the femora 
yellow at the base, nor ciliate, the front coxz piceous. . P. DIREPTOR, nov. sp. (1). 
9. Thorax pollnose, hof orscarcely shining . . . .-.. -. . 7-0. 5 - IK LS QI M. 
Mesonotum shining, except more or less at the humeri and 
alme the atecedae its bristles yellow- «04h24 TRU IV. RI decree. Id. 
10. Bristles of the thorax black; third antennal joint lanceolate 
GIG IPUISRGI C NNI UP nem Tpre perc m M M MP Pr P RN RED a m 
Bristles of the thorax yellow; third antennaljointoval . . . . . . . . . . . . . 13. 
11. Spur of the middle tibize long; posterior crossvein beyond the 
anterior and oblique; anterior femora ciliate with yellow 
haus benedi o9 00 Lu 25 vo 9 wu c d. s P. PLUTO, Melander. 
Spur of the middle tibiae moderate; crossveins meeting, the 
posterior transverse; femora not ciliate, but the middle 
tenor blacibbsnnoss beneath eue VOU A euedeR seo I Ux c e x eom». 12s 
12. Third antennal joint much shorter than arista and not hairy ; 
halteres and calypteres blackish; front femora robust . . P. racERTOSUS, nov. sp. (2). 
"Third antennal joint very long and pubescent, longer than 
arista; halteres and calypteres pale; front femora not very 
Sau MP Sg cpi cel M na. cup; SBINOSUS, nov..sp. (3). 
(1) Platypalpus direptor, nov. sp. — Male. Length r.9 mm. Black, dorsum shining, bristles yellowish, 
pleure cinereous, antennae short, legs brown, the bind femora black, no tibial spur nor femoral cilia, crossveins nearly 
meeting and transverse. Occiput and face cinereous, front moderately broad and very lightly dusted, epistome shining; 
palpi short and blackish; antennz two-jointed, the outer joint short-ovate, half as long as the arista; two pairs of 
black vertical and one of ocellar bristles. Humeri, notopleural suture, scutellum, metathorax and pleure densely 
cinereous pruinose, the sternopleurz largely glabrous; two humeral, one notopleural, one supraalar, one postalar, two 
pairs of scutellar and two of small dorsocentrals, setulae very sparse and fine, seven biseriate acrostichals; abdomen 
shining, pygidium rather large and spherical. Front coxe and anterior femora except the knees brown, posterior coxae 
and hind femora black, tibize and bases of the tarsi yellowish brown; anterior femora stout, neither ciliate nor setose, 
front tibi; as thick as the others. "Veins brown, costa not thickened, its second, third and fourth sections proportioned 
2: L.6 : 1, third vein straight, ending much before the apex of the wing, fourth vein slightly undulating, posterior 
crossvein at two-fifths the length of the wing, slightly oblique and arising a little before the anterior, sections of the 
fifth vein proportioned 0.5 : 0.5 : r, anal crossvein forming an angle of fifty degrees, anal vein indicated only as a 
faint fold, marginal cilia short. 
One specimen, Nelson, British Columbia, July. 
(2) Platypalpus lacertosus, nov. sp. — Female. Length 2 mm. Body, antenne, palpi, halteres, coxze and 
femora except knees, black; mesonotum densely brown-pollinose, bristles black, legs short and stout, tibial spur 
vestigial, middle femora setose beneath, crossveins contiguous. Occipital hairs setiform, black, the two vertical and the 
ocellar bristles strong and black, front and face each short and wide, pollinose, epistome shining, proboscis stout, 
black, palpi with subapical black setze; antenna? very short the outer joint ovate, slightly longer than wide and three- 
fifths as long as the arista. Mesonotum with abundant black setule, the bristles strong, including the humeral, 
scutellars widely separated, a strong lateral scutellar present; pollen of pleurz brownish gray, sternopleura almost 
wholly polished. Abdomen shining, the hairs short and inconspicuous, last two segments dull, styles long and slender. 
Knees, tibize and tarsi brown, front femora robust, front tibiae strong though not incrassate, middle femora with about 
twenty-five minute setule in each row and behind with a series of six long black bristles, middle tibize scarcely two- 
thirds the length of the femora, tarsi not annulate and scarcely darker apically.. Calypteres, fringe and halteres 
blackish. Wings hyaline, two and one-half times as long as wide, veins thin but firm and black, costal sections 
proportioned 5: 3.5: 2.5 : r, first posterior cell ending at the wing-tip, a little widest at the middle, third vein 
straight, fourth vein lightly sinuous, sections of the fifth vein proportioned r: 1: 2, anal crossvein forming an 
angle of fifty-five degrees, anal vein very weak, anal angle rather pronounced. 
Two specimens, North end of Lake Coeur d'Alene, Idaho, August 24, 1916 (Melander). The species is related to 
hians and luctator but is readily distinct in its blackened legs. 
(3) Platypalpus spinosus, nov. sp. — Male. Length 2.2 mm. Black, the legs piceous. The ocellar and 
the two pairs of vertical bristles strong and black; third antennal joint pubescent and slender, three and one-half 
times as long as broad, the arista equal in length to the third joint; face and front cinereous; palpi small, white, 
