FAM. EMPIDID/E 283 
Wings with two crossbands; crossveins meeting; notum dull; palpi 
bearinga very long seta; humeri yellow. . . ; . . . . . . T. SACHEM, nov. sp. (r1). 
I4. Wholly black; propleure pollinose. (Wash.). . . . . . . . . T. woNwacHa, nov. sp. (2). 
Legs, halteres and veins at base of wings in part paler; propleurze 
polished. (Canada, Mass., Vt., N. Y., N. J., Md., Fla., Ill., Wisc., 
Mug Dom el dM uei MM ui Ui cu» d: MAGULIPENNIS, Walker. 
Geographical distribution, 
1. T. emula, Loew, Zeitschr. Ent. Breslau, Vol. 17, p. 22 (1864). C. Europe. 
2. T. aliterpbicta, Becker, Berl. Ent. Zeitschr., Vol. 33, p. 343 [1889] (Tachista S. Europe. 
alteropicta); Acta Soc. Sc. Fenn. Helsingfors, Vol. 26 (9), p. 32 
[1900] (Tachista). | 
3. T. annulimana, Meigen, Syst. Beschr. Vol. 3, p. 69 (1822); Curtis, Brit. Europe. 
Ent. Vol. 8, p. 477 (1833); Meigen, Syst. Beschr. Vol. 7, p. 95 
(1838'; Schiner, Fauna Dipt. Austr. Vol. 1, p. 93 (1862); Loew, 
Zeitschr. Ent. Breslau, Vol. 17, p. 28 [1864] (Tachista); Strobl, 
Progr. Seitenst. Vol. 14, p. 57 (1880); Lundbeck, Dipt. Dan. Vol. 3, 
p. 269 [1910] (Tachista);; Melander, Psyche, Vol. 17, pl. 3, f£. 12 
(1910); Wahlgren, Ent. Tidskr. Vol. 31r, p. 89 (1910); Frey, Acta 
Soc. Sc. Fenn. Helsingfors, Vol. 37 (3), p. 75[1913] (Tachista). 
albitarsis, Zetterstedt, Dipt. Scand. Vol. 3, p. 313 [1842] ( Tachvpeza) ; ibidem, 
Vol..8, p. 3orr [1849] (Tachypeza); Pipping, Not Sállsk. Fenn. Fórh. 
Helsingfors, Vol. 4, p. 114 [1858] (Tachypeza); Nylander, ibidem, p. 247 
[1858] (Tachypeza) ; Bonsdorff, Finl. tvàv. Ins. Dipt. Vol. 1, p. 153 [1861] 
(Tachypeza); Siebke, Cat. Dipt. Norv. p. 24 [1877] (Tachypeza). 
arrogans, Zetterstedt (not Linnzus), Fauna Ins. Lappon. p. 546, var. d [1838] 
(Tachypeza). 
cimicoides, Walker (not Fabricius), List Dipt. Brit. Mus. Vol. 3, p. 506 (1849). 
umbrarum, Haliday, Ent. Mag. London, Vol. r, p. 161 [1833] (TacAyfeza). 
4. T. arrogans, Linnaeus, Fauna Suec. p. 457 [1761] (Musca); Syst. Nat. Europe. 
— .. (ed. 12), Vol. 2, p. 995 [1767] (Musca); Fabricius, Syst. Ent. p. 783 
[1775] (Musca) ; Schrank, Enum. Ins. Austr. p. 467 [1781] (Musca); 
Fabricius, Spec. Ins. Vol. 2, p. 448 [1781] (Muwsca); Mant. Ins. 
Vol. 2. p. 349 [1787] (Muwsca); Gmelin, Syst. Nat. Vol. 5, p. 2852 
[1790] (Mwsca); Fabricius, Ent. Syst. Vol. 4, p. 341 [1874] (Musca); 
? Syst. Ant. p. 263 [1805] (Calobata) ; Olivier, Encycl. Méth. Vol. 8, 
(1) Tachydromia sachem, nov.sp. — Female. Length 1.3 mm. Head black, occiput cinereous dusted, 
front dull black, narrow, sides bulging around the ocelli, the eyes closer together on vertex than above antenne, 
upper facets enlarged, face obliterated; occipital setae flat, scale-like, white; basal antennal joint whitish yellow, outer 
joint short oval, dusky, arista nearly four times the antennal length; proboscis yellow, tipped with brown, palpi small, 
circular, brown, bearing an extraordinary black seta which is nearly twice as long as the proboscis. "Thorax dull in color, 
humeri very large and yellowish, remainder of thorax piceous, pleure lightly cinereous, propleurz shining, one strong 
pair each of notopleurz, dorsocentral and scutellar bristles. Abdomen dull piceous, a little paler at base and apex, its 
sparse short hairs black. Coxze and most of anterior legs yellow, last two joints of anterior tarsi black, hind femora yellow 
on basal third, remainder black, hind tibie white, the distal third black, first two joints of hind tarsi white, the last three 
black, hind metatarsus as long as remaining joints together. Wings narrow, infumated, the base, apex and a central spot 
included between the third and fifth veins hyaline, crossveins meeting, third and fourth veins nearly parallel, sections of 
fifth vein subequal ; halteres pale yellow. 
A single specimen of this remarkable fly received from Pablo Schild, Turrialba, Costa Rica, November, 1922. The 
species departs from the others in Tachydromia in having the thorax dull and the crossveins attingent. 
(2 Tachydromia monacha, nov.sp. — Female. Length2 mm. Related to maculipennis, Walker, but entirely 
black, including the root of the wings, the pedicel of the halteres and the base of the legs. Wings broader, the blackish 
anterior cloud which stops along the middle of the first posterior cell coming exactly to the middle of the wing, — in 
maculibennis the middle of the wing is a little closer to the third vein; the white pruinose spot above the front coxa 
extending on the propleurze, — in maculipenuis it fills the pectus only. "The wings, aside from the blackish cloud, are 
decidedly smoky, and not subhyaline as in maculifennis. 
One specimen, Pullman, Washington, May 3o, 1913. 
