FAM. EMPIDID/E 24 
Mesonotum white- or cinereous-pollinose, not contrasting 
Muh thepleurBdsbdomennotpolinose..- 9. Co SN I M e MR». 79. 
79. Crossveins located before the middle of the wing; costa not 
Seolsn CELO MOS RC) os LU S qe a cR CI SAEI SA Soo SURCISRQUNG. «UD mer s (Oe 
Crossveins at or beyond middle of wing, basal cells elongate; 
costa swollen between first and third veins, . . . . . P. cELLARIUS, nov. sp. (1). 
Har Daseorantenpi Teddish-vellow pz USC USE I IUe T oV de v x Worece oie Ole 
Antenns entirely Dlack.—. 5 96. esso o eos) €. P. CRASSIFEMORIS; 
Var. MELANOCERUS, nOv. var. (2). 
81. Epistome white pruinose; palpi elongate oval and with two 
apicalsete ... . mm e ctoseh eU qud LIA o Va: GRASSIEEMORIS, Sicólr: 
Epistome shining ban. x bseoLah. cela Laurea NE. URDU DN ER acq M d e rd 
82. Palpi broadly oval, without apical setze; tarsi yellow, the last 
JORHE Baci A Lo LE LEN ODINSUHAOL 27 NAI MOLLIS, noy. var, (3). 
Palpi elongate oval; tarsi annulate . .. . . . . . . . var. DEBILIS, Loew. 
83. Posterior crossvein transverse, nearly or quite meeting the 
anterior ifoblique located before the.anteriof | . —. 9 volo. o. e ce Re. 84. 
Posterior crossvein oblique, located beyond the anterior and 
Xue beue dadddeofHe iip 1 o A bue X rre re momo ox OM 
B4. iGrossvemsatorbeyondthe4hiddle of thé wing; 4... . 40e eoo nores 8X 
Crossveins distinctly before the middle of the wing; third and 
fourth veinssubparalel. . . . . . 3 Fox UII PUE UNIDO EAR UR Log 
85. Third vein straight, ending before the apex of iie wing, dourth 
vein lightly sinuous, at the end diverging from the third 
(1r) Platypalpus cellarius, nov. sp. — Male. Length 2.1 mm.  Occiput and notum olivaceous gray 
pollinose, abdomen shining black, legs entirely yellowish, hairs and bristles yellow. — Antenne yellow, the third joint 
ovate, one-half longer than broad, the black arista twice as long as the third joint; face and front narrow, white 
pollinose as is also the epistome; palpi whitish, proboscis black. "Thoracic setule long, one humeral, three notopleural, 
four scutellar bristles; pleurze& whitish pollinose, with a sternopleural glabrous space; pygidium nearly glabrous, its 
fringes short. Front femora with twelve yellow flexor setze, front tibia as thick as the others, not setose, setule of the 
middle legs minute, a few of the hairs of the front side of the middle femora rather erect, the postero-flexor edge with 
seven yellow setze, spur of the middle tibie small and tipped with black, not as long as the diameter of the tibiz, 
tarsi apically more or less dusky. "Veins pale, hind crossvein somewhat oblique, located a little beyond the anterior 
and also beyond the middle of the wing, the basal cells therefore long, second and third sections of the costa thickened, 
subequal and two and one-half times as long as the third, third and fourth veins parallel, straight, the third ending 
before the wing-tip, the underside of the second basal cell two and six-tenths times as long as the last section of the 
fifth vein, base of the anal vein wanting, cilia of the hind margin three-fifths as long as the posterior crossvein. 
Female. Differs in that the third antennal joint is blackish, the thoracic setule are smaller, the dorsum is 
cinereous pollinose, the tarsi are dusky from the tip of the metatarsus, the crossveins are located at the middle of the 
wing and the marginal cilia measure one-half the length of the posterior crossvein. 
One male and one female, Keremeos, British Columbia (Melander) one female from Lusk, Wyoming, the last 
collected by W. M. Wheeler. 
(2) Platypalpus crassifemoris, var. melanocerus, nov. var. —  Differing from the other forms of 
crassifemoris in having the antennae entirely black. Palpi clothed with pure white pubescence; epistome white pubescent 
like the face; tarsi annulate. 
Pullman, Wash. (Melander). 
(3  Platypalpus crassifemoris, var. mollis, nov. var. — Antenne red at base; epistome shining black; 
palpi broadly oval, without apical setz; tarsi yellow, the last joint black. 
Chester County, Pennsylvania (J. C. Bradley); Milwaukee, Wisconsin (C. T. Brues), Avon, Idaho (Melander) 
and Quilcene, Washington (Melander). 
