FAM. EMPIDIDJE 89 
Front tarsi black, hind tarsi not lobate; hind femora without conspi- 
cuous bristles; pubescence of the third antennal joint not very 
vere codd! nox rM M MM o T UD EE CM 
5. Last joint of all the tarsi two or three times as long as the preceding 
joint, the front tarsi uniformly thickened; base of the anal vein 
HISUDOE ERU 2 IS CU colo eR RE TRES. e ue os M. LONGITARSIS; nov. Sp. (1): 
Last tarsal joint not elongate, subequal to the preceding joint; only : 
the basal joint of the front tarsi swollen; anal vein indistinct . . M. cHurRAGna, nov. sp. (2). 
Geographical distribution. 
I M. acroptera, nov. sp. W. United States. 
2. M. chiragra, nov. sp. Washington. 
3. M. longitarsis, nov. sp. Idaho. 
4. M. ornaltipes, nov. sp. Idaho. 
5. M. frecox, Loew, Zeitschr. Ent. Breslau, Vol. 14, p. 47[1863](M?erophorus); C. Europe. 
Strobl, Mitteil. Naturw. Ver. Steiermark, Graz, Vol. 29, p. 93 [1892] 
(Microphorus); Becker, Wien. Ent. Zeit, Vol. 28, p. 25, fig. (1909). 
. M. tubifera, nov. sp. California. 
o 
3. GENUS MICROPHORUS, MACQUART 
Microphorus, Macquart, Dipt. N. France, Vol. 3, p. 139 [1827] (Microphor) ; Hist. Nat. Dipt. Vol. r, 
p. 345 (1834); Zetterstedt, Dipt. Scand. Vol. r, p. 253 [1842] (MicropAora); Boitard, Man. Ent. 
Vol. 3, p. 322 (1843); Walker, Ins. Brit. Dipt. Vol. r, p. 113 (1851); Rondani, Dipt. Ital. Vol. t, 
p. 151 (1856); Bigot, Ann. Soc. Ent. France (3), Vol. 5, p. 563 (1857); Schiner, Fauna Dipt. 
Austr. Vol. i, p. 79 (1862); Lioy, Atti Inst. Sc. Veneto, Venezia, 1864, p. 602 (1864); Loew, 
Zeitschr. Ent. Breslau, Vol. 17, p. 33-50 (1864); Nowicki, Gel. Ges. Krakau, Vol. 42, p. 72 (1871); 
Loew, Syst. Beschr. Eur. Dipt. Vol 2, p. 250 (1871); Beling, Arch. Naturg. Berlin, Vol. 48, 
p. 240 (1882); Bigot, Ann. Soc. Ent. France (6), Vol. 9, p. 118 (1889); Coquillett, Proc. U. S, 
Nat. Mus. Vol. 18, p. 390 (1895); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 332 (1902); 
(1) Microphorella longitarsis,nov.sp.— Male. Lengthi.6mm. Black, opaque, coated with dark slaty brown 
pollen. Lower part of the face tuberculate, third joint of the antennae pubescent beneath, suddenly constricted at its middle, 
one-half longer than broad and about half as long as the arista. Pygidium shining along the interior edge. Trochanters 
not tuberculate, front and hind femora weakly ciliate, joints of the front tarsi thickened and quadrate, first three joints 
together as long as their tibia, the fourth joint shorter than broad and one-third as long as the fifth joint, middle tibie with 
an apical spur, posterior tarsi similar to the front ones but less thickened. "Wings long and narrow, nearly three times as 
long as broad, lightly infumated, sections of the fourth vein proportioned 3 : 3 : 11 : 18, of the fifth vein 1.5 : 1, discal cell 
four times as long as broad, first vein ending beyond the apex of the discal cell, anal vein distinct halfway to the margin. 
Female. Similar except for the genitalia and simple tarsi. 
Ten specimens : Moscow Mountain, Idaho, June 12, 1910. 
(2) Microphorella chiragra, nov. sp. — Male. Length 1.6 mm. Black, coated with dark brownish gray 
: pollen, the abdomen subshining. Third joint of the antennze pubescent beneath, suddenly constricted on its outer third, the 
: basal portion circular, arista one-half longer than the third joint. Seven dorsocentrals present. Fifth, sixth and seventh 
segments of the abdomen tumid ; pygidium very large, flexed to the right, its complicated inner parts large and brownish. 
"Trochanters not tuberculate, femora not ciliate, tibize simple, the middle pair with an apical spine, front metatarsi swollen, 
thicker than their tibiz and as long as the second to the fourth tarsal joints which are of decreasing length, the fourth joint 
more than half as long as the flattened fifth joint, posterior tarsi simple. Wings narrow, nearly hyaline, nearly three times 
as long as wide, sections of the fourth vein proportioned 0.3 : 0.3 : 1 : 1.5, of the fifth vein 1 : 0.7, anal vein short and very 
faint. 
Female. Same, except for the blunt spinose-tipped abdomen and the simple tarsi. 
Nine specimens : Almota and Pullman, Washington, May and June. 
