Hymenopterenfauna von Paraguay. 213 
narrower than the head, its anterior margin slightly raised; two 
longeitudinal sulci on each side of the mesonotum, the inner one 
deep and broadened posteriorly; scutellum moderately convex; the 
median segment rounded, more shallowly punctured than the thorax. 
Abdomen elongate, narrowed at the base, the basal segment longer 
than its breadth at the apex, with a sulcus from the base to the 
middle, all the segments shining and sparsely punctured on the 
dorsal surface, closely on the ventral surface; seventh dorsal segment 
longitudinally rugose near the apex with the sides raised, the apical 
margin rather narrowly truncate. Hypopygium scarcely projecting 
beyond the dorsal segment, narrow and rounded at the apex. The 
ventral surface of the abdomen is flattened, with a very shallow 
groove between the two basal segments. Black; a small spot on 
each side on the posterior margin of the head behind the summit 
of the eyes, and a very large spot on each side of the five basal 
abdominal segments bright orange yellow; the spines of the tibiae 
dark ferruginous. Wings flavo-hyaline; nervures fuscous, ferruginous 
at the base, the costa and stigma ferruginous. 
Length 18—19 mm. 
Q. Mandibles stout and simple: elypeus short, depressed, broadly 
and shallowly emarginate. Head moderately convex, more than half 
as broad again as long, rounded at the posterior angles, subopaque, 
finely and sparsely punctured, with a longitudinal frontal sulcus 
very deep and broad between the antennae, the concave space 
between the antennae and the eyes deep and almost smooth. 
Antennae shorter than the head, the scape shining and punctured, 
much more than half as long as the flagellum. Thorax sparsely 
punetured, the pronotum longer than broad, the anterior angles 
subtuberculate, a small depression laterally just behind the angles 
scarcely extending on to the dorsal surface, the anterior nearly half 
as broad again as the posterior margin. Median segment very 
narrow, pointed at the base, strongly compressed, the dorsal surface 
very small, flat and narrowly triangular, obliquely truncate 
posteriorly, the surface of the truncation elongate, narrow, the sides 
parallel with the lateral margins slightly raised. Abdomen elongate- 
ovate, shining, very shallowly and sparsely punctured; the basal 
segment much broader than long, with a narrow and shallow trans- 
verse groove before the apical margin; second segment with a broad 
shagreened space at the base, opaque, a transverse carina near the 
middle curving forward at the sides, another near the apex, the 
