NORTH AMERICAN HYMENOPTERA. ] o7 
Metanotum punctate; clypeus emarginate; base of second abdominal seg- 
ment reddish riibrociiictiiiii. 
Metanotum striated. 
Front with a strong projection ; anterior half of clypeus strongly carinated. 
trideiitatiini. 
Front with a longitudinal carina above the anteuufe. 
Antennm entirely black. 
Abdomen with the second segment above only reddish ; posterior tarsi 
whitish medially riirozoiialif^. 
Abdomen with the apex of first segment, the second entirely and the 
base of the third reddish arizoiieiise. 
Antennse, except apical portion, reddish fulvous. 
Thorax black, with golden pubescence; dorsnlum finely punctured. 
fexeiise. 
Collar and metanotum rufous; the dorsulum very strongly punctured. 
collin am. 
Metanotum trisulcate; tarsi whitish, the joints of the median and posterior 
pair, at apex ringed with black Johiii^oiii. 
Males. 
Metanotum not trisulcate. 
.\bdomen not banded with reddish. 
Metanotum punctate. 
Wings blue-black ; second abdominal segment beneath with a strong hook 
or spine iieglectiiiii. 
Wings with the anterior pair only fuscous, the posterior pair hyaline ex- 
cept apical margin ; thorax with pale pubescence. .albipilosuiii. 
Metanotum with an enclosed space; posterior trochanters armed with a 
spine; posterior tarsi whitish claTatniii. 
Metanotum on each side with a strong carina, which ends in a stout projec- 
tion l>i*oj e«*t 11 111 . 
Metanotum vvith a raised disc, which is transversely striated. 
cariiiifVoiis. 
Metanotum with a median furrow. 
Legs, except tibial spurs, black ; last joint of the antennse as long as the 
three preceding ones united fi*ig;i(liiiii. 
Metanotum not, or but slightly silicate ; last joint of the autenme shorter 
than the three preceding ones united bideiitat.iiiii. 
Abdomen banded with reddish. 
Posterior trochanters unarmed. 
Metanotum ininctate; base of second segment reddish. .riibroeiiiotiiiii. 
Metanotum transversely striated, with two strong converging cariiue, 
which end in two stout projections triileiitatiiiii. 
Posterior trochanters armed with a spine. 
Antennae entirely black. 
Clypeus emarginate medially; legs entirely black, the posterior tarsi 
whitish medially rufbzoiialis. 
Clypeus broadly incurved medially, with a tooth in the middle (see fig. 
5) ; the base of the tibiae and the posterior tarsi medially, reddish. 
$«l>iiio*«iiiii. 
TRANS. AM. ENT. SOC. XVIII. 
( 18 ) 
JUNE, 1891. 
