Microdon (Kryptopyga) pendulosus (Hull, 1944).
Hull, F.M. (1944) Some genera of flies of the family Syrphidae. Journal of the Washington Academy of Sciences 34, 129-134.
Hull (1944) described a new genus, Kryptopyga, for his species pendulosa. He stated that was close to Ptilobactrum. In 1949, Hull (1949) placed under Microdon as subgenus. Cheng and Thompson (2008) do not recognize it as subgenus.
Adapted from original description (Hull 1944). See original description in the attached document.
MALE.
Head: the occiput and vertex exceedingly bloated and tumid; the eyes broadly separated, the posterior margin of occiput sharp and shelving instead of rounded. Face bulbous on the ventral portion, in ground color light brown becoming brownish yellow ventrally and along the sides, leaving the middle broadly darker brown. Pile of face pale, shining brassy and appressed. The vertex and upper part of front are dark shining brown with short pale pile; the area immediately above the antennae and on its sides is shining chestnut-brown and bare. Antennae extremely long and pendulous. The scape is slightly curved, flattened upon the inner surface, barely over one-fourth as long as the basoflagellomere; the pedicel is minute and button-like and about one-eighteenth as long as the basoflagellomere; basoflagellomere slender, enlarged just before the blunt apex, 4 mm long, and upon the outer half thickly clothed with long, erect, delicate, dark-brown pile. The arista is a mere spur, located a short distance from the base of basoflagellomere. Eyes bare.
Thorax: dark, dull brownish black, with faint trace of the darker brown, pair of slender, widely separated, medial vittae that are confluent a short distance before the scutellum. Outside of this pair of vittae on each side there is a wide, longitudinal vitta of appressed, golden pile, reaching almost to the scutellum and crossing a slender transverse fascia of similar pile running along the transverse suture,
which, however, extends only a short distance inward medial to the longitudinal vitta. Posterior margin of postpronotum banded with similar pile. Scutellar margin almost evenly rounded but actually very bluntly protuberant in the middle; its color yellowish brown.Legs: dark reddish brown, blackish upon the basal half of the metafemora, extensively upon the mesofemora. Profemora more reddish brown. Protibiae basally and almost the whole metatibiae reddish brown; elsewhere these and the mesotibiae are blackish; there is silvery pollen upon the tibiae in several places. Metafemora moderately thickened, spindly upon the basal half. Wings: strongly tinged with brown, with heavy stigmal cross vein, well developed vena spuria and a strong brown patch, diffuse-edged, occupying part of the apex of the wing.
Abdomen: elongate, club-shaped, scarcely narrowed basally, the third tergum slightly wider than the basal half of the abdomen. First segment elongate, pale brown, subtranslucent, strongly transverse striate, darker brown upon its anterior corners and concolorous posteriorly with the basal half of the rather long second segment. Second segment darker brown posteriorly. Third segment barely longer than the first two segments, dark brownish black, produced downward into an enormous, thickened club, the fourth segment actually vertical and thrust downward, simulating a false hypopygium. The false hypopygium is actually concealed by the third segment which is so curved around that only a small opening is visible ventrally by turning the fly upside down. The third segment of the venter is produced into a curious shield-shaped overlapping flap, which serves still further to close off the genitalia.
unless otherwise stated