210 EMBRIK STRAND, 
with a yellowish tinge in some lights; nervures black, ferruginous 
at the base and on the costa. 
Length 16—20 mm. 
Q. Mandibles stout, not bidentate; the clypeus broadly and 
very shallowly emarginate; antennae very little longer than the 
head, the scape beneathı with long hairs; the front between the eyes 
and the base of the antennae smooth and slightly concave. Head 
subrectangular, much broader than long, closely punctured, with a 
longitudinal frontal suleus, the posterior margin almost straight. 
Pronotum twice as broad -anteriorly as long, the anterior margin 
strongly depressed on each side leaving the middle and the anterior 
angles prominent, the anterior angles produced laterally and sub- 
tuberculate. Median segment concavely depressed from the scutellum 
and broadened posteriorly; the thorax punctured, the median segment 
almost smooth. Abdomen very sparsely punetured; the basal segment 
with a very narrow transverse groove before the apex; the second 
segment transversely rugose between two carinae, a broad groove 
between the apical carina and the raised apical margin, the base 
of the segment rather broadly smooth; fifth ventral segment rugose. 
Pygidium truncate posteriorly, rounded at the apex, much longer than 
broad, the epipygium short und longitudinally striated, the hypo- 
pygium forming a process deeply emarginate anteriorly. 
Black; a large spot on each side round the base of the antennae, 
a broad band on the lateral margin of the head reaching the 
posterior angle and continued beyond it on the posterior margin, 
an oblique line on each side on the vertex nearly reaching the large 
frontal spots and a rather small spot on each side of abdominal 
segments 1—5, emarginate anteriorly on segments 3—4 yellow. 
Mandibles (except at the apex), antennae, tibiae and tarsi ferruginous 
brown. 
Length 12—13 mn. 
Hab. Theresopolis, South Brazil. 
Types in British Museum. 
In another female specimen the yellow spots are absent from 
the fifth segment, and in another male the yellow markings, except 
those on the head are entirely absent. Variations in the extent of 
the yellow markings are common in the T’hynnidae, although in many 
species they seem to be constant, at least locally. 
