FAM. EMPIDID/E 135 
metathoracic spiracle brown. Abdomen (Q) with nine segments, the eighth lengthened and compressed, 
styles long and narrow, abdominal hairs very sparse. Legs long, slender, hairy, hind tibiz& and 
metatarsi with long delicate extensor setze. Wings more or less cuneiform in outline, costa stopping 
at apex, first vein ending near basal two-fifths of wing, auxiliary vein straight, evanescent apically, 
stigma strong, third vein ending at wing-tip, its anterior branch erect, submarginal cells wide, basal 
cells much shorter than the discal, fourth and intercalary veins evanescent apically, anal crossvein 
abruptly reflexed, in line with the outward continuation of the cubitus, only the base of the anal vein 
indicated, axillary incision weak, shallow; calypteres with a few long hairs. 
Genotype : Emfis rubida, Wheeler & Melander. This species was originally described from 
Mexico. Bezzi has recorded it from Bolivia. Pablo Schild has taken it in Costa Rica. The 
peculiar antenne can well remove this form from the complex genus Emfis. "The genus isa likely 
ancestor to Lamfprempfis. 
Geographical distribution. 
1. O. vubida, Wheeler & Melander, Biol. Centr. Amer. Dipt. Vol. 1, p. 368 Mexico, Bolivia. 
[1901] (Empis); Melander, Trans. Amer. Ent. Soc. Vol. 28, p. 302, 
f. 121 [1902] (Empis); Bezzi, Nova Acta Akad. Naturf. Halle, 
Vol. 91, p. 343, 348 [1909] (Empis); Deut. Ent. Zeitschr. Beiheft, 
P. 89 [1909] (Empis). 
24. GENUS LAMPREMPIS, WHEELER & MELANDER 
Lamprempis, Wheeler & Melander, Biol. Centr. Dipt. Suppl. p. 366 (1901); Melander, Trans. Amer. 
Ent. Soc. Vol. 28, p. 278 (1902); Coquillett, Proc. Ent. Soc. Wash. Vol. 5, p. 252, 263 (1903); 
Bezzi, Ann. Mus. Hungar. Vol. 3, p. 434 (1905); Melander, Williston, N. Amer. Dipt. Man. 
p. 225 (1908); Bezzi, Nova Acta Akad. Naturf. Halle, Vol. 9r, p. 3o2, 340 (1909); Kertesz, Cat. 
Dipt. Vol. 6, p. 38 (1909); Coquillett, Proc. U. S. Not. Mus. Vol. 37, p. 557 (1910). 
Characters. — Brilliant metallic, blue or green or polished black species with elongate antenne 
and erect fork of the third vein. Head longer than broad, placed low down on the thorax, eyes of the 
male contiguous above the antennae, the upper facets enlarged, eyes bare, marginal excision at the 
antenne very shallow and broad; face with parallel sides, usually shining, of the male rather narrow, 
of the female moderate, no cheeks; antenne inserted well above the middle of the head, porrect, the 
first joint elongate cylindrical, more than twice as long as the second, and abundantly hairy; proboscis 
longer than the head, vertical, slender, the lobes of the labella long and very narrow ; ocellar triangle 
hairy, raised in the male, occipital hairs abundant. Thorax very greatly hunchbacked, especially in 
front, devoid of strong bristles, but densely pilose, several weak but long notopleurals and scutellars ; 
pleure partly pollinose, with a series of many long strong metapleural hairs, pectus with some long 
hairs. Abdomen less abundantly furnished with hairs; pygidium of moderate size, lateral valves broad 
at the apex, penis short and thick; abdomen of the female flattened, the terminal segments retractile 
into the fifth. Legs rather stout, strongly hairy, the hind pair largest, front metatarsi frequently 
swollen, hind femora, tibia and metatarsi of the male sometimes furnished with apophyses or groups 
of hairs, or they may become pennate with flat scales, posterior legs of the female often strongly 
compressed and feathered with scale-like hairs. Wings sometimes pictured, usually clear hyaline or 
with brownish tinge, rather pointed, the costal edge straight, costal hairs microscopic, no basal bristle, 
costa stopping at the third vein, auxiliary vein straight and distinct, almost attaining the costa, third 
