123. IDIA PROLATA, n. s. (Group Rhyncomya, _Desvoidy_). _Foem_.
Viridis, sat angusta, capite testaceo frontalibus facie maculisque
duabus anticis nigris, antennis halteribusque testaceis, abdomine
cyaneo purpureo cupreoque vario fasciis duabus aureo-viridibus,
pedibus nigris, alis cinereis basi et apices versus fuscis.
_Female._ Green, rather narrow, with slight cinereous tomentum; head
testaceous, white behind; frontalia and face black and shining, the
former linear; a black spot on each side of the peristoma; epistoma
rather prominent; eyes bare; antennæ testaceous, not near reaching
the epistoma, 3rd joint about thrice the length of the 2nd; abdomen
blue, tinged with purple and with cupreous, a little broader than
the thorax, with two golden green bands which are widely interrupted
above; legs black; wings grey, brown at the base and towards the tips,
with the exception of the hind border; veins black; præbrachial vein
forming a much rounded and very obtuse angle at its flexure, which
is near the border, nearly straight from thence to its tip; discal
transverse vein slightly curved outward, parted by much less than its
length from the border, and by about its length from the flexure of
the præbrachial; alulæ and halteres testaceous. Length of the body
3-1/2 lines; of the wings 5 lines.