FAM. EMPIDIDZE 113 
the basals, anal crossvein abruptly reflexed, usually extending back half the length of the anal cell, the 
anal vein usually arising at the juncture of the crossvein with the under side of the cell. 
Type species : H. maura, Fabricius (Pl. 6, Fig. 55), selected by Curtis in 1838. 
of Hilara are common along small streams, often skimming over the surface in an aerial dance. 
The species 
'The 
The 
genus is best developed in the Northern Hemisphere, although a few species are known from South of 
the equator. 
males of some species have the habit of enveloping their prey in a web spun from the mouth. 
Geographical distribution, 
1. H. abdominalis, Zetterstedt, Fauna Ins. Lappon, p. 555 (1838); Dipt. N. Europe. 
Scand. Vol. 1r, p. 337 (1842); Strobl, Verh. Ges. Zool..bot. Wien. 
Vol. 42, p. 180(1892) ; Wahlgren, Ent. Tidskr.Vol, 31, p. 77(t910). 
2. H. aberrans, Bezzi, Nova Acta Akad. Naturf. Halle, Vol. 91, p.376 (1909). Bolivia. 
3. H. abnormis, Bezzi, ibidem, Vol. 91, p. 377 (1909). Peru. 
4. H. aeronetlha, Mik, Wien. Ent. Zeit. Vol. 11, p. 81 (1892); Strobl, Verh. C. Europe. 
Zool.-bot. Ges. Wien, Vol. 42, p. 158, note (1892); Mitteil. Naturw. 
Ver. Steiermark, Graz, Vol. 29, p. 89 (1893); Mik, Wien. Ent. Zeit. 
Vol. 13, p. 283 (1894); Lundbeck, Dipt. Dan. Vol. 3, p. 162, f. 59 
(1910); Verrall, Ent. Mag. London, Vol. 48, p. 24 (1912). 
var. angustifrons, Strobl, Verh. Zool-bot. Ges. Wien, Vol.42, p. 132, 158,note(1892); C. Europe. 
Mitteil. Naturw. Ver. Steiermark, Graz, Vol. 29, p. 89 (1892). 
5. H. athiops, Zetterstedt, Fauna Ins. Lappon, p. 556 (1838); Dipt. Scand. XN. Europe. 
Vol. rz, p. 347 (1842); Strobl, Verh. Zool.-bot. Ges. Wien, Vol. 42, 
p. 132, note (1892). 
6 ? H. albipennis, Roser, Correspondenzbl. Landw. Würtemb. Stuttgart, C. Europe. 
Vol. 1, p. 53 (1840). 
7. H. albitarsis, Roser, ibidem, Vol. 1, p. 53 (1840). C. Europe. 
8. H. albocingulata, Wood, Ent. Mag. Lond. Vol. 49, p. 13 (1913). England. 
9. H. algecirasceusis, Strobl, Wien. Ent. Zeit. Vol. 18, p. 24 (1899). Spain. 
10. H. almeriensis, Strobl, Mem. Soc. Esp. Hist. Nat. Vol. 3, p. 310 (1906). Spain. 
ir. H. amaranta, Becker, Zeitschr. Hym. Dipt. Vol. 7, p. 123 (1907). Tunis. 
12. H. anglodanica. Lundbeck, Naturh. Medd. Kjóbenhavn, Vol. 64, p. 325 Denmark. 
(1913). 
13. H. atra, Loew, Berl. Ent. Zeitschr. Vol. 6, p. 205 : Cent. 3, No. 42. United States. 
(1862); Coquillett, Proc. U. S. Nat. Mus. Vol. 18, p. 394 (1895); 
Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 266 (1902). 
14. H. aurata, Coquillett, Proc. Wash. Acad. Sc. Vol. 2, p. 411 (1900); Alaska. 
Melander. Trans Amer. Ent. Soc. Vol. 28, p. 269 (1902). 
15. H. baculifer, Melander, ibidem, Vol. 28, p. 271, f. 96 (1902). Georgia. 
16. H. balnearia, White, Proc. Roy. Soc. Tasmania, 1916, p. 223, f. 41b (1917). Tasmania. 
17. H. barbipes, Frey, Medd Soc.Sc. Fenn. Helsingfors, Vol. 33, p. 67(1907); Finland. 
Acta Soc. Sc. Fenn. Helsingfors, Vol. 37 (3), p. 56, f. 9 (1913). 
18. H. bares, Walker, List Dipt. Brit. Mus. Vol. 3, p. 491 (1849); Brunetti, EE. Indies. 
Fauna Brit. Ind. Dipt. Vol. 1, p. 359 (1920). 
19. H. basalis, Loew, Berl Ent. Zeitschr. Vol. 6, p. 206 : Cent. 3, No. 45  lllinois. 
(1862); Coquillett, Proc. U. S. Nat. Mus. Vol. 18, p. 394 (1895); 
Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 267 (1902). 
20. H. Beckeri, Strobl, Verh. Zool.-bot. Ges. Wien, Vol. 42, p. 143 (1892); C. & N. Europe. 
Mitteil. Naturw. Ver. Steiermark, Graz, Vol. 29, p. 9o (1892); 
Lundbeck, Dipt. Dan. Vol. 3, p. 167, f. 61 (1910); Wahlgren, Ent. 
Tidskr. Vol. 31, p. 76 (1910); Verrall, Ent. Mag. Lond. Vol. 48, 
