FAM. EMPIDID/E 145 
with long thin sete before the incisures, pygidium large or small. Legs setose, normal. Wings 
normal, anal angle full, axillar incision deep and acute, costa with basal spine. 
Tyne species : Empis rufescens, Loew. | E. tridentata, Coq. also belongs here. Both species 
inhabit North America. ; 
SuBGENUS XANTHEMPIS, BEZZzI 
Characters. — Yellowish, bare, middle-sized species not showing sexual dimorphism. Eyes 
of both sexes separated, facets uniform, front of male parallel-sided; head piriform, the occiput 
projecting, its bristles in two regular series; first antennal joint usually lengthened, third narrow and 
long. Prothorax neck-like, bilobed and setigerous above; notal bristles small, no pubescence, dorso- 
centrals uniseriate, no acrostichals, typically one humeral, no notopleural, one posthumeral, one 
supra-alar and two or four scutellar bristles, the inner ones cruciate; metapleural setule fine and 
moderately few. Abdomen sparingly hairy and not bristly, pygidium large, with large free penis, styles 
of ovipositor rather long. | Legs not stout, simple, slightly hairy. "Wings with strong veins, third vein 
curving back and ending at wing-tip, discal cell blunt, anal angle obtuse. 
Xanthempis is regarded as ancestral to the other divisions of Empis, as is shown by the yellow, 
bare body with reduced bristles, the dichoptic males and lack of sexual dimorphism. The species 
inhabit shady places in woods and thickets during early summer and do not hover in the aerial dance 
characteristic of other species. Nearly all the known species are European, although two of the 
following list are American. 
Type species : Enfis stercorea, Linnaeus, by Bezzi's designation. Additional species are the 
following : E. emula, Lw., equalis, l:w., albifrons, Bez., caucasica, Bez., concolor, Verr., digramma, Meig., 
feruginea, Meig., Kunizei, Beck., leta, Lw., loewiana, Bez., lutea, Meig., pallida, Lw., parvula, Egg., pitto- 
$rocta, Lw., peciloplera, Lw., punctata, Meig., scutellata, Curt., semicinerea, Lw., styriaca, Strobl, festacea, 
Fabr., Zesticulata, Bez., trigramma, Meig., and univitiata, Lw. 
Geographical distribution. 
1. E. abbreviata, Loew, Berlin. Ent. Zeitschr. Vol. 13, p. 84 (1869); Strobl, C. Europe. 
Mitteil. Naturw. Ver. Steiermark, Graz, Vol. 29, p. 69 (1892); 
Kuntze, Zeitschr. Hym. Dipt. Vol.6, p. 303 (1906) ; Bezzi, Deutsche 
Ent. Zeitschr. Beiheft, p. 102 [1909] (CoptopAlebia). 
2. E. abbrevinervis, Meijere, Tijdschr. v. Ent. Vol. 54, p. 328 (1911). Java. 
3. E. abcirus, Walker, List Dipt. Brit. Mus. Vol. 3, p. 494 (1849); Melander, Georgia. 
Trans. Amer. Ent. Soc. Vol. 28, p. 299 (1902). 
4. E. abrupta, Thomson, Eugen. Resa, Dipt. p. 473 (1870). Cape of Good Hope. 
5. E. adusta, Loew, Beschr. Eur. Dipt. Vol. r, p. 266 (1869); Kuntze, Corfu. 
Zeitschr. Hym. Dipt. Vol. 6, p. 213 (1906). 
6. E. emula, Loew, Beschr. Eur. Dipt. Vol. 3, p. 228 (1873); Kuntze, C. Europe. 
Zeitschr. Hym. Dipt. Vol. 6, p. 211 (1906); Bezzi, Deutsche Ent. 
Zeitschr. Beiheft, p. 9o [1909] (Xanthempis). 
7. E. equalis, Loew, Berl. Ent. Zeitschr. Vol. 1r, p. 13, 20 (1867); Strobl, C. Europe. 
Mitteil. Naturw. Ver. Steiermark, Graz, Vol. 29, p. 60 (1892); 
Kuntze, Zeitschr. Hym. Dipt. Vol. 6, p. 211 (1906); Bezzi, 
Deutsche Ent. Zeitschr. Beiheft, p. 89 [1909] (XantAempis). 
? pallens, Roser, Correspondenzbl. Landw. Ver. Würtemb. Stuttgart, Vol. r, 
p. 53 (1840); Bezzi, Deutsch. Ent. Zeitschr. Beiheft, p. 89 (1909). 
8. E. eribes, Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 328 (1902). — . N. W. United States. 
PI. 9, Fig. 14. 
