nd obscurely rufo-piceous.

_Male._ Rather smaller than the female, more slender and more pubescent,
the pubescence on the face paler.

_Hab._ Aru.

6. SPHEX GRATIOSA. _S._ capite thoraceque nigris, abdomine caeruleo, alis
fusco-hyalinis.

_Male._ Length 10 lines. Head and thorax black; the face densely clothed
with pale golden pubescence; the labrum and mandibles highly polished,
very smooth and shining; a thin pale pubescence is scattered over the
head, pro- and mesothorax, the latter obscurely chalybeous above,
shining, and finely and closely punctured, with an abbreviated, deeply
impressed line in the middle anteriorly; the posterior margin of the
prothorax covered with shining silvery pubescence; the metathorax
opake, and clothed with black pubescence; wings fusco-hyaline, the
anterior pair darkest towards their base, the nervures dark
fusco-ferruginous, nearly black. Abdomen smooth, shining dark blue;
beneath, the margins of the segments have a bright, glittering,
pale-golden pile.

Gen. PELOPOEUS, _Latr._

1. PELOPOEUS LABORIOSUS. _P._ niger; scapo antice, pedibus petioloque
rufescenti-flavis, alis hyalinis fulvo tinctis.

_Female._ Length 12 lines. Black, with black pubescence on the head and
thorax; the face with a fine cinereous pile; the scape yellow in front;
the mandibles smooth and shining. Thorax: the legs pale ferruginous, the
posterior femora darkest; the coxae, the anterior and intermediate
trochanters, and base of the femora black; wings fulvo-hyaline, the
nervures ferruginous; the metathorax obliquely striated. Abdomen
slightly shining at the base, with the petiole reddish-yellow.

_Hab._ Aru.

Gen. LARRADA, _Smith_.

1. LARRADA MODESTA. _L._ nigra; abdomine pilis argentatis fasciato; alis
hyalinis.

_Female._ Length 6-1/2 lines. Black; the face covered with silvery down;
the mandibles smooth, shining, black, and fringed beneath with fulvous
hairs, the cheeks silvery. Thorax slightly shining, closely and
delicately punctured; the metathorax opake and transversely striated;
wings subhyaline, with a fuscous border at their apex, the nervures
black. Abdomen slightly shining; the apical margins of the first,
second, and third segments with fascia of silvery pile, which is very
brilliant in certain lights.

_Male_ closely resembles the female, but has an additional fascia on the
abdomen.

_Hab._ Aru.

Gen. LARRA, _Fabr._

1. LARRA SIMILLIMA. _L._ nigra, pulchre prismatica, maculis fa