342 DIPTERA 
Antenne yellow at base; femoral setule yellow; front 
unusudly long. . . . . Sw ne tal UCET e DOUEEUS, HOY: SO OY. 
99. Thoracic bristles black; tarsi not LM DMN ir erra ROAD EUM i 
Thoracic bristles yellow; tarsi usually moreorlessannulate. . . . . . . . . . . . 102. 
100. Third antennal joint lanceolate, twice as long as wide and 
shorter than the arista; middle tibize two-thirds as long as 
the femora, the middle femora without yellow setze in front. P. rALARIS, nov. sp. (2). 
Third antennal joint slender, over three times as long as 
wide, longer than its arista; tarsi piceous beyond the base, 
middle tibiz three-fourths as long astheir femora . . . . . . . . . . . . . . IOI. 
10t. Abdominal segments with pollinose fasciz; base of the anal 
vein indicated, but weak . . . . . - « . . P. 1Ncunvus, Melander. 
Abdomen uniformly black; base of the id vein wanting, 
veins very. coQT$6 . . . . . ^ ^4 ^ s. . « 5... Ei GRAVIDUS, Melander. 
102. Crossveins at middle of wing; tarsi yellow and not or 
scarcely annulate; costa more or less thickened from first 
to third veins, base of anal vein wanting; mesonotum with 
golden pollen; third antennal joint about one-third the 
Crossveins before middle of wing; tarsi usually more or less 
annolete; cost not thickened ... . . . . . 4 42s. 9 4. 7039 4 SLE 
8 
(1) Platypalpus oculeus, nov. sp. — Length 1.7 mm. Black, densely cinereous pollinose, even the 
sternopleurz: covered except for a minute central spot, abdomen shining, testaceous, legs and antenne yellow, 
tibial spur equal to the diameter of the tibia. Head obliquely drawn out below, the antennz inserted well down 
so that the face is only one-half as long as the front, epistome not pruinose; palpi yellow, proboscis brown; 
vertex with white setze: Thoracic Lristles yellow, no humeral, three small notopleurals, one 'supraalar, one 
postalar, seven dorsocentrals, íour scutellars the lateral ones small. Front femora biseriately ciliate beneath, 
middle femora not thicker than the front ones, their usual two rows of flexor setulae 
yellow setze, middle tibiz three-fourths as long as their femora.  Veins pale yellow, costa 
and fourth veins straight, nearly "— the first posterior cell widest at apex, second, third and 
of the costa proportioned 2.4 : 2.4 : 1, posterior crossvein before the middle of the wing, nearly transverse, 
separated írom the anterior ien length of the latter, sections of the fifth vein proportioned o.5 : 0,8 : 1, anal 
crossvein perpendicular, base of the very weak anal vein entirely wanting, marginal cilia shorter than the 
anterior crossvein. ; 
One specimen, Philadelphia, Pennsylvania (Brues) The pollinose pleurz, reddish abdomen, pronounced 
dorsocentrals, yellow femoral setulze and slanting head make a combination of characters readily distinguishing this 
species, 
(2; Platypalpus talaris, nov. sp. — Length 2.5 mm. Black; front cinerous, rather broad, widening above, 
face narow and white, epistome black; palpi oval, yellow, not hairy and with a single apical seta; proboscis black; 
antenna three-jointed, the last joint elongate ovate, apparently twice as long as wide and about one-half as long as the 
arista; one pair of black vertical bristles. Thorax moderately covered with olivaceous-yellow pollen, bristles black, 
humeral small, one notopleural, one supraalar, one postalar, one dorsocentral, two scutellar, acrostichal setulee biseriate, 
sparse; pollen of the pleurz yellowish, sternopleural spot large; abdomen shining black, pygidium very small. Legs 
including the coxe testaceous, tarsi very slightly dusky towards the tip, not annulate, front femora with thirteen 
yellow flexor cilia, middle femora with yellow sete in back, middle tibie two-thirds as long as their femora, their spur 
large.  Veins blackish, first vein thickened on entering the costa, the second, third and fourth costal sections 
proportioned 4 : 2.3 : 1, third vein straight, fourth vein slightly undulating, crossveins slightly before the middle of 
the wing, nearly meeting, the posterior somewhat oblique, sections of the fifth vein proportioned 0,5 : 1 : rz, anal 
crossvein perpendicular, anal vein faint, marginal cilia short. 
Type c' from Mount Constitution, Orcas Island, Washington, July 31, 1908. Additional specimens from 
Bellingham, Lynden (Melander) and Friday Harbor (Aldrich), Washington; Milwaukee, Wisconsin (Wheeler); Waubamic, 
Ontario (H. S. Parish), and Montrcal, Quebec (Beaulieu). 
Hr 
yellow, posteriorly with six 
TN D EUNT ES T3 ip us a Nei Ei ER E Sr ium 
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