The Hymenoptera of the Georgetown Museum. 435 
furrowed down the middle. The metanotum alutaceous, densely covered with 
a white pile, the sides of the basal part irregularly, widely striated ; the apical 
slope has a deep furrow, which is deeper above than below ; it is bordered by 
fine striz. The middle and the apex below of the metapleure are irregularly 
obliquely striated. Female. 
Length 11 m.m. 
The antennal scape is as long as the following 2 joints united ; the 3rd and 
4th are almost equal in length. The apex of the hind tibiew and their long 
spurs are reddish, as are also the claws ; the long spur of the hind tibie is as 
long as the metatarsus ; the tibiz and tarsi are longish. 
Tachysphex rufo-geniculata, sp. n. 
Black, the pubescence pale golden ; it forms narrow, but distinct bands on 
the apices of the abdominal segments ; the knees and the tibiz in front rufous 
as are also the apices of the joints of the 4 anterior tarsi ; the tarsal spines are 
pale ; wings hyaline, the anterior fuscous along the fore margin, the nervures 
and stigma black, the Ist abscissa of radius is not quite twice the length of the 
2nd ; which is one-fourth shorter than the 3rd. The eyes above are separated 
by the length of the 2nd and 3rd antennal joints united. Ocelli Jonger than 
wide, a conical projection in its centre above and below. Apex of clypeus 
depressed in the centre, punctured above the depression. The 3rd joint of 
the antennz is not quite one quarter longer than the 4th. Metanotum finely, 
closely transversely striated, more or less finely reticulated on the outer part ; 
the apical slope with a distinct shining furrow; which has about 6 clearly 
separated strie in the centre. Male. 
Length 8 m.m. 
The apical half of the antenne is brownish beneath. The 2nd transverse 
cubital nervure is received shortly beyond the apex of the basal third; the 2 
recurrent nervures are separated from each other by a slightly greater dis- 
tance than they are from the base of the cellule. The long spur of the hind 
tibie is half the length of the metatarsus; the tarsi incline to brownish, 
especially at the base. 
Tachytes excellens, sp. n. 
Black, densely covered with white pubescence, the abdominal segments at 
the apices, with broad bands of silvery pubescence, the pygidium densely 
covered with silvery pile ; besides the pile the front and vertex bear longish 
pale hair ; the basal 3 segments of the abdomen bright red ; the 4 front knees, 
apex of 4 front tibie and their tarsi rufo-testaceous, the hind femora red 
narrowly black at the base, the tibie red, narrowly infuscated at the apex, the 
tarsi of a slightly paler red, the apices of the joints slightly infuscated ; wings 
hyaline, the costa and stigma testaceous ; the Ist abscissa of the radius as long 
as the 2nd which is twice the length of the 3rd; the 2nd recurrent nervure is 
received shortly, but distinctly before the middle ; the 2 recurrent nervures are 
separated from each other by a distinctly less distance than they are from 
the base of the cellule. Female. 
Length 10 m.m. 
