220 Mr. J. @#FWestwood’s descriptions of 
3a, the face and antenna; 34, labrum; 3c and 3d, man- 
dibles; 3e, maxilla; 3f, labium and tongue; 3g, 3h and 
32, the hind leg and its tibia in different points of view. 
Closely allied to Momia Nortoni of Cresson (Trans. 
Amer. Ent. Soc. Vol. I. No. 4, p. 385), but the male of 
that insect is described as having three long acute spines 
on the inner edge of the excavation of the posterior tibia, 
which is not the case with my species, of which I have 
received several examples of both sexes. 
Nomia celestina. (Pl. V. fig. 4.) 
Leete purpureo-cerulea, crebre punctatissima, capite 
et thorace fulvo-hirtis, metathorace et abdominis basi 
griseo-hirtis; antennis nigris, subtus piceis, pedibus flavis, 
femoribus basi eneis, posticis supra viridi-nitidis, incras- 
satis; tibiis crassis, tarsis posticis articulo basali crasso com- 
presso, subtus biemarginato, ( Mas.) 
Long. corp. lin. 6; expans. alar. antic. lin. 10. 
Habitat in Mexico (D. Coffin, Hym. No. 94). In Mus. 
Hopeiano Oxoni (olim nostr.). 
This very elegant species is of a rich purple-blue colour, 
very finely and closely punctured, the head and thorax 
thickly clothed with fulvous hairs, except the hind portion 
of the latter, in which the hairs are of a greyer colour, as 
they are also on the base of the abdomen and upper side 
of the hind femora; the anterior margin of the upper lip 
and the mandibles are clear yellow; the antenne are black 
above, but pitchy-red beneath ; they are short, with the 
2nd joint distinct; the tegule are of moderate size, the 
abdomen ovate, each segment above having a transverse 
raised ridge of a black colour beyond the middle, the pos- 
terior margin of each segment being glabrous; the lees 
are short and yellow-coloured, and the femora and tibie in 
all the legs marked above and at the sides with dark 
zeneous or purple; the posterior femora are much swollen 
and slightly angulated near the base of the under edge; 
the hind tibiz are regularly clavate, with the calearia 
scarcely visible; the hind tarsi have the basal joint broad 
and compressed, with a long shallow emargination along 
the middle of its under edge, and with a much deeper 
and smaller one at the extremity of the same edge; the 
first recurrent vein in the forewings is received at about 
two-thirds of the length of the 2nd submarginal cell, and 
the second recurrent vein at about three-fourths of the 
3rd submarginal cell. The underside of the terminal ven- 
