324 IIYMENOPTERA OF AMERICA. [PART I. 



Still I find a difference. 1st, in the form of the head, not so 

 circular, a little broader, giving it another appearance; 2d, in the 

 1st abd. segment, evidently smaller, not so broad at its base, 

 but a little more funnel-shaped, a little depressed, a little longer, 

 not quite as sessile. This becomes very evident when the abdo- 

 men is bent downwards. 1 It is also not quite as wide as the 2d 

 segment; this being longer than in conformis and a little con- 

 stricted at base, to lit into the 1st segment. 



These characters of the abdomen seem to me to indicate a 

 species different from 0. conformis, but which can only be dis- 

 tinguished by a very experienced eye. — I can only compare the 

 females, the male of 0. conformis being unknowm to me. Com- 

 pare 0. Pennsytvanicus. 



Hab. The United States. New York, 2 2, 3 £, taken by me. 

 Connecticut, 9 9, 6 £ (E. Norton). 



124. O. XaiitEiiaailJS Sauss. £>• — ^ig er ) clypeo punctato, thorace 

 lsevi, inipunctato; metanoto solorugoso; post-scutello transverse obtuse 

 cristato ; metatboracis foveola superne subacute marginata ; abriomine 

 punctato; secundi segmenti linea marginali crasse punctata ; tertio in 

 medio perrugose punctato; reliquis tenuiter punctatis ; scapo antice, 

 puncto mandibularum, frontali, oculari et post-oculari, fasciaque arcuata 

 in stunrao clypeo, rnaculis 2 obliquis pronoti, macula subalari, post- 

 scutello, fasciis 2 inetauoti, abdominis vittis 2, maculisqne 2 parvulis 

 lateralibus segmentornm 1', 2', flavis ; pedibus runs, luteo-maculatis, 

 basi nigris ; tegulis runs, flavo-rnaculatis. 



Odyn. Xantianus Sacss. Revue de Zool. XXII, 1870, 103, 22, 9. 



Total lengtb, 11 mm. ; wing, 7.5 mm. 



9. Size, form, livery nearly as in 0. anormis, but differing 

 from it by the following characters. Clypeus a little more 

 coarsely punctured and more truncate. Thorax smooth, not 

 sensibly punctured, except on the upper face of metathorax. 

 Scutel ported by a groove. Post-scutel elevated into a sort of 

 blunt crest, flattened behind (seen from behind the edge is arcuate 

 or rather trapezoidal, nearly bi-mamillated). Metathorax having 

 its superior face a little prolonged behind the post-scutel, includ- 

 ing it on both sides; widely truncate ; its hinder face or excava- 



1 Thi-^ position is a quite indispensable conoTtion for the good study of 

 Odynerus, and should be given to all the specimens. 



