Diptera danica : genera and species of flies hitherto found in Denmark . isca arcuata De Geer (nec L.)1776. Mém. Ins. VI, 125, 15. — 1775. Fabr. Syst. Entom. 767, 22 (Stjr-phus) et 1805. Syst. Antl. 184,3 (Mulio). — 1816. Fall. Dipt. Suec. , 2 (Mulio). — 1822. Meig. Syst. Beschr. III, 162, 2, Tab. XVII, Fig. 7. —1841. Loew, Stett. ent. Zeitg. II, 138, 159. — 1843. Zett. Dipt. Scand. II,636, 4 et 1855. XII, 4644, 4 et 1859. XIII, 5074, 4. — Musca UpunctataO. F. Miill. 1776. Zool. Dan. Prodr. 2041. Male. Vertex black, more or less greyish behind; frons black,yellow or greyish pruinose beh
Diptera danica : genera and species of flies hitherto found in Denmark . isca arcuata De Geer (nec L.)1776. Mém. Ins. VI, 125, 15. — 1775. Fabr. Syst. Entom. 767, 22 (Stjr-phus) et 1805. Syst. Antl. 184,3 (Mulio). — 1816. Fall. Dipt. Suec. , 2 (Mulio). — 1822. Meig. Syst. Beschr. III, 162, 2, Tab. XVII, Fig. 7. —1841. Loew, Stett. ent. Zeitg. II, 138, 159. — 1843. Zett. Dipt. Scand. II,636, 4 et 1855. XII, 4644, 4 et 1859. XIII, 5074, 4. — Musca UpunctataO. F. Miill. 1776. Zool. Dan. Prodr. 2041. Male. Vertex black, more or less greyish behind; frons black,yellow or greyish pruinose behind at the eye-margins; epistoma yellowwith a broad middle stripe and a band downwards from the lower 574 Syrphidae. part of the eye black; sometimes the whole lower side part black ;vertex with black, behind with yellow hairs, frons with black or brownhairs; epistonia with pale hairs. Jowls varying from orange to whitish grey pruinose, the hairs whitish below, yellow above,somewhat long. Eyes with short, whitish hairs. Antennæ black, third. Fig. 195. Antenna of C. festivuni d, from the inside. X 40. joint much shorter than tlie two basal joints together, and all threejoints of nearly equal length^; arista about of the length of the thirdjoint, brownish yellow on the basal part. Thorax black, shining, withtwo grey stripes, abbreviated behind the middle and a little diverging;it has the usual yellow longitudinal side spots from humeri to thetransverse furrow, and on the postalar calli and produced forwards;they are not widely interrupted; thorax is clothed with somewhatlong, brownish hairs. Scutellum yellow with a smaller or larger blackspot on the disc; it has brown hairs with more or fewer black onthe middle. Pleura with the usual three yellow spots somewhat largeand distinct; the hairs are yellow. Abdomen black, dull, somewhatshining at the hind margins of the segments, along the middle lineand at the apex; it has four pairs of bright yellow, equal
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