This species belongs to the Lonchaea impressifrons-group of
species recognised by McAlpine (1960). The long sinuous aedeagus with a bulbous tip
shows it to be close to species such as L. impressifrons Bezzi, 1920 and L. viriosa. It differs
from both these species however in that the surstyli do not extend posterioventraly
beyond the shell of the epandrium and in the shape of the surstyli. McAlpine noted that in
species of this group the pregonites are unequally developed, in L. asymmetrica this
unequal development has extended to the surstyli
Description.Male: Head: Eyes bare. Frons rather wide, narrowing only slightly from the
level of the ocellar triangle to the level of the antennal bases where it is approximately
60% the width of an eye, subshining with short hairs on mid and upper parts with some
longer hairs present on the anterior margin above the lunule, all these hairs less than half
the length of the orbital bristle. Orbital plate brightly shining and bare. When viewed from
above, lunule, face and parafacials with a silvery sheen.
Antenna all black. First flagellomere large and long, three times as long as it is deep
reaching over the mouth edge. Arista yellow basally with very short pubescence, hairs on
each side about as long as the width of the arista.
Thorax: Thoracic dorsum subshining blue black with very short hairs these not more
than one third the length of the orbital bristle. One propleural and one stigmatical bristle
each about as strong as the other. Anepisternum with three strong anterior bristles, the
lower one being rather weak, and two strong posterior bristles. Katepisternum with one
strong bristle, no hairs posterior to or below this bristle. Scutellum with disc bare, ratherbrassy black, on the margin between the strong lateral and apical bristles with one short ZOOTAXA
hair, no hairs between apical bristles. Squamae and fringes whitish, wings clear with light
yellow veins. Wing length 3.0 mm. Legs black but with basal and second tarsomere of all
legs clear yellow with a ventral fringe of yellow setulae, remaining tarsomeres darkened.
Abdomen rather spherical.
Male genitalia; Fig. 1; 4,5. Cerci fused, with a sclerotized swelling near the base similar
to that found in L. viriosa McAlpine, 1960, this is best seen in lateral view and gives
the cerci an extended, sinuous appearance. Epandrium in lateral view slightly higher than
it is wide, rather rectangular. In lateral view surstyli only extending slightly beyond shell
of epandrium along its ventral edge, no posteroventral process. Surstyli differing in shape,
right one broader than the left and with a deep circular excavation posteriorly taking up
more than a third of the depth of the surstylus, the left one with a smaller excavation taking
up about a quarter of the total depth. Aedeagus long and sinuate with a bulbous apex.
Female: Unknown