24 U. S. NATIONAL MUSEUM BULLETIN 216 pabt 3 



punctures on mesopleurum moderately dense; sternaulus extending 

 the length of mesopleurum, weaker on its apical 0.3; basal carina 

 of propodcum usually weak or absent medially but always strong and 

 complete laterally; propodeal tubercles strong but short and rounded; 

 apical propodeal carina absent but represented by the pair of tubercles; 

 areolet small, almost square, open; nervulus at or a little distad 

 of basal vein ; nervellus broken near its lower end ; postpetiole smooth 

 or with traces of median longitudinal carinae, impunctate, its lateral 

 face separated from dorsal by a rounded angle; ovipositor cylindric, 

 the tip of its upper valve with moderately strong transverse ridges. 



The generic name Baryceros has not been in use because of a 

 mistake in the type locality of the originally included species. It 

 was described as European, but no one has been able to rediscover it 

 in Europe. Examination of the type in Wroclaw, Poland, in 1958, 

 showed that it belongs to this genus, and to a species common in the 

 Guianas. The name Christolia, a synonym of Baryceros, was based 

 on a specimen from Brazil, described as a female but probably a male. 

 The type is lost, but the original description agrees with the genus 

 Baryceros very well. 



The genus is exclusively American, with a large number of species 

 in the Neotropic region and five in the Nearctic. Since our species 

 are rather uniform in structure the descriptions of structure given 

 below are only in comparison with B. audax, which is considered the 

 norm for the Nearctic species. 



As in other genera of the subtribe, the species parasitize cocoons 

 of Eucleidae, Adults occur in sunlit places or in semishade, among 

 deciduous trees and bushes — the same habitat that is characteristic 

 of the eucleids. 



Keys to the Nearctic Species of Baryceros 



MALES 



1. Hind tarsus black ; notaulus indistinct; white spot on lower part of mesopleurum 



ovoid, its front end not curved upward; hind coxa fulvous and white. 



5. texanus (Ashmead) 



Hind tarsus white or mostly white; notaulus distinct; white spot on lower part 



of mesopleurum elongate with its front end curved upward, or broken into 



two spots 2 



2. Hind coxa fulvous, with a basal white spot above; mesosternum entirely 



black 4. halli, new species 



Hind coxa black and white; mesosternum more or less white, at least with a 

 white spot next to sternaulus 3 



3. Mesosternum almost entirely white 2. fortis (Cresson) 



Mesosternum black, with a white spot or stripe next to sternaulus ... 4 



4. Orbital white band complete, or weakly interrupted near top of hind orbit; 



last segment of hind tarsus white with its apical 0.5 to 0.6 blackish (as seen 

 from above) 1. candidus (Cresson) 



