3oo DIPTERA 
12. GeENUs SYMBALLOPHTHALMUS, BECKER 
Symballophthalmus, Becker, Wien. Ent. Zeit. Vol. 8, p. 285 (1889); ibidem, Vol. 9, p. 34 (1890); 
Mitteil. Zool. Mus. Berlin, Vol. 2, p. 42 (1902); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 257, 
261 (1903); Kertész, Cat. Dipt. Vol. 6, p. 145 (1909); Lundbeck, Dipt. Danica, Vol. 3, p. 283 
(1910); Melander, Psyche, Vol. 17, p. 49 (1910); Wahlgren, Ent. Tidskr. Vol. 31, p. 54 (1910). 
Macroptera, Becker (not Lioy, 1864, which is Ula, Tipulide), Wien. Ent. Zeit. Vol. 8, p. 8o (1889); 
Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 252 (1903). 
Characters. — Black, shining, slender, nearly bare species with slender, long legs and cuneate 
wings. Head spherical, eyes large, the forward facets coarse, broadly contiguous above the antenne 
thus obliterating the front, but widely separated below the antennze, the face very short, the epistome 
large, filling in the oral opening to the very narrow cheeks; proboscis slender, shorter than the head- 
height, inflexed, the palpi minute, slender, setulose. Antenne three-jointed, inserted below the middle 
of the head, the second joint without lengthened setze, the third joint elongate, straight above, rounded 
below, long ham-shaped, the two-jointed terminal arista closely and briefly pubescent. One supraalar 
bristle, six scutellars, sparse biseriate acrostichal setule present, the hairs of the posterior part of the 
mesonotum proclinate, of the anterior part reclinate as usual; pleurze shining, the metapleurz velvety. 
Last abdominal segments of the female protractile, pygidium globular and complexly forcipate above. 
Legs simple, the middle femora with biseriate weak setule and the front tibi; with weak extensor 
setulze, middle tibiz as long as their femora, front metatarsi of the male with long flexor hairs, no true 
bristles present, tibize without apical spur or spines. Wings with long slender base, costa not thickened 
and with a small basal bristle, the first vein ending beyond the middle of the wing, pedicel of the second 
and third veins long, crossveins meeting and nearly transverse, anal crossvein and outer part of anal 
vein present, anal angle very obtusely rounded and shallow. 
Genotype : S. dissimilis, Fallen, is the unique species. It occurs from the Alps north to central 
Sweden. 
Geographical distribution. 
1. S. dissimilis, Fallen, Empid. Suec. p. 9 [1815] (Tachydromia); Meigen, Syst. Europe. 
Beschr. Vol. 3, p. 85 [1822] (Tachydromia) ; Zetterstedt, Dipt. Scand. 
Vol. 1, p. 308 [1842] (Tachydromia) ; Walker, List. Dipt. Brit. Mus. 
Vol. 3, p. 509 [1849] (Platyfalfus) ; Zetterstedt, Dipt. Scand. Vol. 8, 
p. 3o10 [1849] (Tachydromia); Walker, Ins. Brit. Dipt. Vol. r, p. 133 
[1851] (Platypalfus); Lundbeck, Dipt. Dan. Vol. 3, p. 284, f. 13o 
(1910); Wahlgren, Ent. Tidskr. Vol. 31, p. 9o (1910); Frey, Acta 
Soc. Sc. Fenn. Helsingfors, Vol. 37 (3). p. 75 (1913). - 
cyanophthalmus, Strobl, Progr. Seitenst. Vol. 14, p. 8 [1880] (Platypalfus) ; 
Wien. Ent. Zeit. Vol. 1o, p. 267 (1891); Mitteil. Nat. Ver. Steiermark, 
Graz, Vol. 29, p. 123 (1892). 
fictipes, Becker, Wien. Ent. Zeit. Vol. 8, p. 8o, f. 3-5 (Macroptera) ; ibidem, 
p. 285 (1889). 
of the female entirely black, of the male the basal half of the femora yellow, the remainder of the hind legs blackish brown. 
Second vein very strongly curving forward, the first four sections of the costa proportioned 1 : 0.5 : 1.2 : 0.6, third vein uni- 
formly diverging from the fourth, basal cells small and of equal extent along the fourth vein, hinder crossvein oblique, sections 
of the fourth vein, 1 : 3.5, of the fifth vein, 1 : 1.3. 
One specimen of each sex, taken by C. T. Brues in grass sweepings along a ditch at Matucana, Peru, July 1, 1913. 
