Hymenopterenfauna von Paraguay. 191 
shining, finely aciculate. Abdomen sparsely punctured, the first 
segment not much narrowed at the base, the apex raised, with a 
transverse groove before it; second segment with four strong trans- 
verse carinae including the raised apical margin; the ventral 
segments more coarsely punctured, especially on the fifth segment. 
Pygidium abruptly truncate posteriorly, the surface of the truncation 
very broadly oval, almost circular. 
Black; the base of the mandibles, a broad transverse band 
across the front surrounding the eyes, a narrower band interrupted 
in the middle on the posterior margin of the head, and a spot on 
the vertex with an oblique line on each side of it brownish yellow; 
the apex of the first dorsal segment, the carinae on the second, the 
pygidium and the spines of the tibiae and tarsi fusco-ferruginous; legs 
fuscous; the ventral segments broadly testaceous at the apex. 
Length 10 mm. 
Hab. Brazil (BURMEISTER). 1 specimen. 
This may prove to be the female of gratiosus Sm. It differs from 
typical Spilothynnus in the presence of an additional carina on the 
second dorsal segment, in the carinated clypeus, the compression 
and concavity of the sides of the pronotum posteriorly and the 
greater breadth of the first segment of the abdomen. 
Spüothynnus(?) gratiosus SM. 
(Pl. 11, Eig. 20.) 
2 2 from Brazil (Burmeister). The hypopygium is rather 
more prominent than in the type, being narrow, slichtly rounded at 
the sides near the base and then sharply narrowed to the base of 
the acute apical spine. The clypeus is subtubereulate in the middle, 
shallowly triangularly depressed in the middle of the apical margin, 
the angles of the depression produced into very short spines. The 
antennae are considerably longer than the head and thorax com- 
bined. differing markedly in this respect from typical Spelothynnus, 
as well as in the spined hypopygium. But until the female is known 
it is better not to make a new genus. The female will doubtless 
be found to belong to the section in which the second abdominal 
segment is transversely carinated without a rugose area. 
