short-tongued bees of the genus Nomia. 219 
interno apicali late producto et albido, tarsis posticis 
articulo basali maximo, compresso, fulvescenti. 
Long. corp. ¢ lin. 84; expans. alar. antic. lin. 15. 
Habitat in Mexico (D. Coffin, Hym. No. 96). In Mus. 
Hopeiano Oxoniz (olim nostr.). 
This is one of the finest and largest species of the genus, 
remarkable for the length of the male antenne, which 
are gradually attenuated beyond the middle, and termi- 
nated in an acute point; they are black at the base and 
on the upper side, but fulvous-brown beneath and at the tip, 
the second joint is scarcely visible, the face is clothed with 
greyish-luteous hairs. The mandibles are elongate-conic, 
pointed at the tip, with a strong conical tooth in the 
middle of the upper edge; the labrum is short, rounded in 
front, and ciliated ; the maxillary palpi are scarcely larger 
than the labial. The thorax is short and nearly rounded ; 
the pubescence of the front part being more luteous than 
that of the posterior portion; the scutellum is short and 
entire, but with a longitudinal central impression; the 
abdomen is elongate-ovate, punctured, and moderately 
clothed with blackish hairs; each segment has a strong 
transverse impression beyond its middle, the hinder por- 
tion of each being smooth and of a beautiful opaline- 
green colour in the 2nd, 3rd, 4th and 5th segments, the 
pale-coloured margin in the last segment being attenuated 
on each side; the hind femora are short, and very much 
incrassated, especially on the upper side, but destitute of 
spines on the under side; the tibiz are very short and 
thick, the inner angle being produced into a thick, obtuse 
lobe, concave within (the two calcaria arising within the 
excavation), and of a dirty-white or buff colour, which is 
also the colour of the basal joint of the posterior tarsi, 
which is much elongated and broadly compressed, widest at 
its base, the mner edge being slightly concave, so as to 
give the idea of its being a pollinigerous corbicula. The 
2nd and 3rd ventral segments are divided by a straight, 
central, longitudinal impression into two flattened opaque 
lobes in the middle of each joint, the sides being strongly 
setose; the first recurrent vein arises at about two-thirds of 
the length of the 2nd submarginal cell, and the second 
recurrent vein at about three-fourths of the length of the 
3rd submarginal cell. The female has simple black an- 
tenne, simple legs, the hind ones not corbiculated, and 
only three green fasciz on the abdomen. 
Pl. V. fig. 3, Nomia Cressonz, male, slightly enlarged ; 
