190 EMBRIK STRAND, 
Spülothynnus stygius n. sp. 
(PE 11, Pe; 10.) 
d. Closely and finely punctured, more coarsely but shallowly 
on the abdomen and mesopleurae, the head, thorax and sides of the 
abdomen thinly covered with long black pubescence. Mandibles 
much less strongly elbowed than in E. inferna, bidentate, the inner 
tooth short and truncate. Clypeus with a prominent, laterally com- 
pressed tubercle in the middle, a shining, narrow, longitudinal de- 
pression from the tubercle to the anterior margin, the sides of the 
depression produced into blunt teeth on the anterior margin, giving 
the appearence of a narrow emargination. Antennae scarcely longer 
than the thorax and median segment combined, the apical joints 
arcuate, shorter than in E. inferna. Abdomen narrow and flattened, 
tapering at the extremities, the first segment with a shallow suleus 
from the base to the middle; hypopygium narrow, rounded at the 
apex and not extending beyond the dorsal segment, without lobes 
or Spines. 
Entirely black; the wings light fusco-violaceous; nervures fus- 
cous, the stigma ferruginous. 
Length 17—18 mm. 
Hab. Tucuman, N. Argentina (STEINBACH). 2 specimens. 
Very closely resembles E. inferna from which it may be 
distinguished by the very different clypeus, the less strongly elbowed 
mandibles, the rather shorter antennae, the shorter hypopygium and 
the different colour of the wings. In spite of the very close super- 
ficial resemblance to E. inferna I look upon it as generically distinct, 
the characters given by AsHumeaAD for Spilothynnus being very fairly 
applicable to this species. 
Spilothynnus burmeisteri n. sp. 
2. Clypeus broadly emarginate anteriorly, with a longitudinal 
carina from the base. Head shining, microscopically punetured, with 
a few scattered large punctures, and a very distinet longitudinal 
frontal sulcus; twice as broad as long and strongly rounded at the 
posterior angles. Pronotum sparsely punctured, less than half as 
wide as the head, a little longer than the breadth on the anterior 
margin, compressed and subconcave on the sides posteriorly. Median 
segment sparsely punctured, shorter than the pronotum. Pleurae 
