OP NATURAL HISTORV. 705 



Var. &. Posterior margins of tlie terminal ncp^cntii of the 

 terguin obsolctely ferrujjjinoiis. 



Var. *. The ferruginous color predominates having but a 

 small portion of black on the thorax ; the tcrgum is fcrruginoun 

 with only a line of black on the first segment, and a triangle of 

 black at base of the second segment ; but the yelluw baud ou the 

 first segment is still visible though less obviouH. 



Length over four-fifths of an inch. 



Not a common insect. 



2. R. 5-FAScrATUM nob. {Plerochihu,) Appendix to Ix>ng'B 

 second Expedition. I am not sure of the generic place of my 

 specimens as they have lost their trophi. [Ante 1, 234.] 



3. K. CRYPTicu.M nob. (Odi/nerus,) Western Quarterly Re- 

 porter. [Ante 1, 168.] 



4. R. ANNlLATUM uob. {Otfj/ncrus,) Appendix to ling's 

 second Expedition. [Ante 1, 235.] [385] 



ODYNERUS Latr. 



1. 0. QUADRISECTU8. — Black; trunk before and behind, tcrgum 

 before and a band, white. 



Inhabits United States. 



Body black, punctured : head with a small .spot above the in- 

 terval of the antenna?, line on the basal joint of the antenns, 

 superior lateral margin of the clypeus and slight spot on ba.se of 

 the mandibles obscure white : thorax, a bi-lobed band on the an- 

 terior margin, spot beneath the wing, triangular spot each side 

 on the scutel, transverse line behind the scutel, behind that again 

 on each side is a very large triangular spot extending down al- 

 most to the origin of the abdomen, white; edge of the posterior 

 declivity of the metathorax with a slight bifid, transverse, denti- 

 culated crest: wings dark violaceous: terguni, first sogniont 

 white, with a dorsal, triangular, lobated black spot communi- 

 cating with the black anterior declivity ; second segment with 

 nn undulated, dull white band behind, and an ob.Milete, verysmsill 

 spot of the same color each side before the middle : feet with 

 short, whitish sericeous hair. 



Length over seven-tenths of an inch. 



1837.] 



