398 Mr. F. Sinith’s Descriptions 
Genus Noma, Latr. 
Nomia Kirbii, Westw. MS. (PI. XXI. fig. 5.) 
Male.—Length 7 lines. 
Black ; the head narrower than the thorax, the face and pos- 
terior margin of the vertex with a thick sooty-black pubescence ; 
the antenne a little shorter than the thorax, the apical joint com- 
pressed; the thorax clothed with short sooty pubescence ; the 
wings dark brown; the anterior tibiz and tarsi fringed behind 
with sooty pubescence; the intermediate femora incrassate and 
compressed beneath into a semidentate process; the posterior tibia 
also much swollen, forming a subtriangular mass which has a tooth 
at its inferior angle; abdomen ovate and shining, being thinly 
covered with sooty pubescence. 
This species is from Brazil; it formed part of the Collection of 
the Rev. W. Kirby, and is now in the British Museum. 
Fam. APIDE. 
Genus Tretratonia, Spin. 
Tetralonta mirabilis, (Pl. XXI. fig. 2.) 
Male.—Length 3 an inch. 
Head and thorax black; the clypeus, Jabrum and mandibles 
yellow, the base of the former black and the apex of the latter fer- 
ruginous; the face, cheeks and hinder margin of the vertex thickly 
clothed with long pale fulvous hair; the antennze elongate, ex- 
tending to the middle of the abdomen; the scape, first and base 
of the second joint of the flagellum black, the third to the eighth 
joints, which are cylindric and of about equal length, ferruginous 
and of the usual form, the three following attenuated to the thin- 
ness of a hair, the apical joint being black, flattened and pear- 
shaped ; the thorax clothed above with fulvous pubescence, much 
paler beneath; the tegule, base of the nervures of the wings and 
the legs ferruginous; the wings subhyaline, the nervures fusco- 
ferruginous, the costal nervure blackish ; abdomen reddish-brown, 
the basal margins of the segments with broad fascize of fine short 
pale downy pubescence. 
The species is from Rio. 
Notwithstanding the remarkable form of the antenne of this 
insect, I leave it for the present in the genus Yetralonia; should 
other species occur with similar antennal peculiarities, they may be 
conveniently separated from Tetralonia, and constitute a new genus. 
