DESCRIPTIONS OF TWENTY-THREE NEW GENERA AND 

 THIRTY-ONE NEW SPECIES OF ICHNEUMON-FLIES. 



By Henry L. Viereck, 



Of the Bureau of Entomology, United States Department of Agriculture. 



This paper is based chiefly upon South American material in the 

 collection of the United States National Museum and in the Konig- 

 liche Zoologische Museum, Berlin The specimens from the Berlin 

 museum were collected for the most part by ^Ir. J. D. Anisits in 

 Paraguay and were submitted to the writer for identification with the 

 assurance that the United States National Museum was to be favored 

 with duplicates of the several species. 



In addition to the South American species which were mostly col- 

 lected at large there are a few reared species that promise to become 

 of economic importance. 



FAMILY BRACONID.^. 



ASPIGONUS STRAMINEICOLOR, new species. 



Type-locality. — San Bernardino, Paraguay, K. Fiebrig, S. V. 22. 



Type. — Konigliche Zoologische Museum, Berlin. 



Structurally this species is so similar to the genotype of Baeacis 

 that I think its true position may be approximated by comparing it 

 with Aspigonus (Baeacis) ahietis Ratzeburg. Aspigonus diversi- 

 cornis Wesmael the genotype of Aspigonus is unknown to the writer 

 through a specimen. It would seem to the wTiter that Baeacis must 

 fall as a synonym of Aspigonus if it offers no more differences than 

 those mentioned in the original description of the genus. 



Female. — Length, 4.5 mm.; sheaths of the ovipositor apparently 

 as long as the body; tegument uniformly stramineous except for 

 part of the head; face without a shallow fossa between the eyes and 

 the scrobes, antennae 30-jointed, blackish, scape stramineous beneath, 

 space between the ocelli black, mandibles strammeous at base shading 

 to castaneous then to black at the tips; rugae of the propodeum 

 arranged so as to represent the poorly defined limits of areolas; first 

 dorsal segment virtually smooth and polished throughout like the 

 rest of the abdomen; otherwise very similar to the species compared. 



Proceedings U. S. National Museum, Vol. 46-No. 2031. 



359 



