5o DIPTERA 
tinct; females dichoptic, male eyes. meeting on. the front only; 
antenne with a style; middle tibie without. bristles, hind femora 
ciliate with erect hairs... ANE coc MELDE M RUIT. 
B. Discal cell emitting only two gestori veins, ; dle Soit vi vein sboldi: 
first vein ending at three-fourths the wing-length, costa evanescent Vues 
beyond. third vein; eyes of both sexes contiguous on the face and ; 
usually on the front as well; antenne with a lengthened arista; s 
broboscis and palpi very small |... . . c M VENIT 
C. Discal cell emitting only two posterior veins, 4ha Sede vein 
wanting ; antenne with short arista; Proboscis and falpi usually 
projecting horizontally forward; hind femora incrassate and 
spinose below, hind tibie geniculate . . . DG DUI M ITI Ue ME 
D. Discal cell absent, confluent with posterior cells, the anterior érossvein 
nearly or quite joined to the second basal cell, anal crossvein abruptly 
fefiesed as in ust Embidino; face warrom . 0. 0. V0. VU QU VL qx A DEUM 
2. Hind legs slender and not spinose; basal joint of antenna. imperfect, 
the third joint shortor long... 2540.4 4. 4 cy PES NO ETE 
Hi ind femora thickened and spinose below, hind tibie PENAT ket 
near the knee; antenna three-jointed, the. third. joint. elongate, ^i 
cylindrical and. with a short thich style; upper facets of male eyes 
small, .scarcely larger tham the lowermost; ovipositor present, 
(PLHuTE.9) |... . Genus CEparza, Meigen. 
3. Proboscís rigid, lengthened, directed obliquely Joven, jali Mer. 
face mot deeply excised; front of female broad; antemma three- 
jointed, the third joint elongate oval; thorax shining, uo fost- 
humeral bristles; ovibositor Present ; second basal cell very wide, its 
crossvein perpendicular (Pl. B, Fig. 82). . . . . . . Genus EurHYNEURA, Macquart. 
Proboscis very. short. or moderately lengthened ; basal joint of the 
antenne quite vestigial; thorax often more or less pollinose, posi- 
humeral bristles present ; second basal. cell not. greatly widened, its 
crossvein oblique . . , . * CA. WO esa i NCNTA RUN SE 
4. Species measuring nearly five mm.; aed » dV Péiedhi, discal 
cell narrow. and much longer than second. posterior, fourth vein 
ínterrupled, first vein ending. close lo second, third vein. ending 
beyond tip of wing; third anlennal joint. obbyriform; proboscis 
retracled ; thorax moderately elevated; venter of male with sparse 
lnghars(Eocene . . . . . . . . - . . . . Genus *PnorOGDALEA, Cockerell. 
Species about two mm. in lenglh, anal crossvein. move retracted so as to 
be in line with the crossvein of the second basal cell, discal cell 
about as long as the second posterior, intercalary vein sometimes 
interrupled but not. the fourth, first vein shorter, third vein ending 
aFvIÉERE . o ai 2 eq. 7 0. 0 o NON PM ANC 
5. Eyes of both sexes widely separated, "T Rura not "ini antenna 
lacking the siyle; proboscis retracted. within the wide oral cavity, 
palpi bulbous; bygidium large and erect, ovipositor lengthened ; 
yellow species with yellow bristles .— . Eie ue ere MN ALLANTHALIA, nOV, gen. 
H 
