Hymenopterenfauna von Paraguay. 207 
Elaphroptera acutidentata n. sp. 
(ee Fo. 6.) 
2, Mandibles bidentate, the inner tooth much shorter than the 
outer, but not truncate. Clypeus broadly but rather shallowly 
emarginate at the apex, the angles of the emargination prominent, 
produced into short spines; a subtriangular depression extending 
from the apical margin, where it is as broad as the emargination 
nearly to the base, where it is narrowly rounded; the elypeus almost 
smooth, produced from the base to the base of the depression, not 
tuberculate, a cluster of long brown hairs at the base of the de- 
pression. Antennae inserted as far from each other as from the eyes, 
as long as the thorax and median segment combined, the apical joints 
arcuate. Head finely and very closely punctured, much broader 
than long, rounded at the posterior angles, the interantennal promi- 
nence very feebly bilobed, an obscure longitudinal carina on the 
front reaching to the anterior ocellus. Thorax celosely punctured; 
the pronotum short, almost smooth, with the anterior and posterior 
margins raised; the mesonotum with two longitudinal sulci on each 
side; scutellum moderately convex. Median segment punctured- 
rugulose, rounded, fully half as broad again at the base as long, 
with an obscure longitudinal suleus from the base. Abdomen elongate, 
longer than the head, thorax and median segment combined; the 
first segment narrow at the base, with a longitudinal sulcus from 
the base to beyond the middle; the seventh dorsal segment deflexed, 
coarsely rugose, longer than the breadth. at the base and rather 
narrowly truncate at the apex; the remaining dorsal segments closely 
punctured, the ventral segments more closely and finely punctured. 
Hypopygium straight and narrow, scarcely produced beyond the 
apex of the seventh dorsal segment. 
Black; mandibles (except at the extreme apex), elypeus, the 
margins of the eyes broadly as high as the base of the antennae, 
a narrow curved band at the posterior angles of the head, the an- 
terior and posterior margins of the pronotum narrowly interrupted 
in the middle, the tegulae, the scutellum in the middle and a small 
spot at each of its anterior angles, the postscutellum, a broad oblique 
band on each side on the apical half of the median segment con- 
verging anteriorly, an interrupted band near the apex of the first 
dorsal abdominal segment, a large spot on each side on segments 
2—5 and the femora beneath yellow. Wings hyaline, shaded with 
