FAM. EMPIDID/E 73 
Geographical distribution. 
I. St. sylvaticus, Becker, Ann. Soc. Ent. France, Vol. 83, p. 1:23 [1914] E. Africa. 
(Acanthofeza). 
2. St. unipunctatus, Loew, Oefv. Vet. Akad. Fórh. Vol. 15, p. 340 (1856); Cape of Good Hope. 
Dipterenf. Südafr. p. 261, f. 45 (1860). — PI. b, Fig. 44. 
13. GENUS BICELLARIA, MACQUART 
Bicellaria, Macquart, Mém. Soc. Sc. Lille, 1823, p. 155 (1823); Bigot. Ann. Soc. Ent. France (6), 
Vol. 9, p. 122 (1889); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 246, 261 (1903); Melander, 
Williston Man. N. Amer. Dipt. 3 ed. p. 225 (1908); Bezzi, Nova Acta Akad. Naturf. Halle, 
Vol. 91, p. 3oo (1909); Kertész, Cat. Dipt. Vol. 6, p. 13 (1909) ; Coquillett, Proc. U. S. Nat. Mus. 
Vol. 37, p. 514 (1910); Lundbeck, Dipt. Dan. Vol. 3, p. 20 (1910); Wahlgren, Ent. Tidskr. 
Vol. 31, p. 43, 48 (1910). 
Cyrtoma, Meigen, Syst. Beschr. Vol. 4, p. 1 (1824); Macquart, Dipt. N. France, Vol 3, p. 106 (1827); 
Hist. Nat. Dipt. Vol. r, p. 359 (1834); Zetterstedt, Fauna Ins. Lappon. p. 533 (1838); Westwood, 
Gen. Syn. p. 133 (18409); Zetterstedt, Dipt. Scand. Vol. r, p. 329 (1842); Boitard, Man. Ent. 
Vol. 3, p. 326 (1843); Walker, Ins. Brit. Dipt. Vol. rz, p. 115 (1851); Rondani, Dipt. Ital. Vol. r, 
p. 152 (1855); Bigot, Ann. Soc. Ent. France (3), Vol. 5, p. 564 (1857); Schiner, Fauna Dipt. 
Austr. Vol. r, p. 76 (1862); Lioy, Atti Inst. Ven. 1864, p. 722 (1864); Bigot, Ann. Soc. Ent. 
France (6), Vol. 9, p. 123 (1889); Coquillett, Proc. U. S. Nat. Mus. Vol. 18, p. 39o (1895); 
Williston, Man. N. Amer. Dipt. p. 74 (1896); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 335 
(1902); Coquillett, P:oc. Ent. Soc. Wash. Vol. 5, p. 248 (1903); Proc. U. S. Nat. Mus. Vol. 37, 
p. 53o (1910). 
Characters. — Rather small, greatly humpbacked, more or less opaque black species with no 
discal cell. Head globular, attached low to the thorax ; eyes broadly contiguous above the antennz in 
both sexes, bare, the upper facets large and separated from the lower by a horizontal line of demarca- 
tion; face long and narrow, no cheeks; occiput hairy but not bristly ; antennze located at the middle of 
the head, two-jointed, due to the fusion of the basal joints, the third joint elongate, somewhat com- 
pressed, usually somewhat bulbous below near the base, ending in a two-jointed thickened arista which 
is more or less shorter than the third joint and consists of a short basal and a lengthened apical 
segment; proboscis much shorter than the head, vertical, the labrum slightly incurved and pointed, 
palpi short, broad and decumbent. Thorax very large, provided with a greater or less number of fine 
bristles, posthumeral and lateral hairs usually quite evident, scutellum with about four bristles, acros- 
tichals loosely biseriate; pleure bare. Abdomen slender, tapering, pygidium terminal, small and 
closed, the lateral valves oval and directed backward, ventral piece cleft, ending in a symmetrical two- 
tined fork. Legs rather long, hairy, often with long fine bristles, often the hind femora ciliate, the hind 
legs longest, usually with clavate tibize, hind metatarsi sometimes thickened. Anal angle of the wings 
rectangular, a distinct angulation at the axilla, costa stopping at the.end of the third vein, basal bristles 
present or absent, auxiliary vein lying close to the first vein, third vein simple, anterior crossvein placed 
close to the fork of the second and third veins, no discal cell, the fourth vein interrupted at the anterior 
crossvein resuming again toward the tip of the wing as a weakened spur, the intercalary vein likewise 
weak and evanescent basally, second basal cell longer than the first, its crossvein very oblique, almost 
in line with the last section of the fifth vein, anal cell wider than the first basal, its crossvein reflexed 
and broadly angulate with the continuous anual vein. 
