OP NATURAL HISTORY, 765 



Var. 0. Posterior margins of the terminal segments of the 

 tergura obsoletely ferruginous. 



Var. K. The ferruginous color predominates having but a 

 small portion of black on the thorax ; the tergum is ferruginous 

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

 black at base of the second segment ; but the yellow band on the 

 first segment is still visible though less obvious. 



Length over four-fifths of an inch. 



Not a common insect. 



2. E. 5-FASciATUM nob. [PterocMlus,] Appendix to Long's 

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

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



3. R. CRYPTICUM nob. {Odynerus,) Western Quarterly Re- 

 porter. [Ante 1, 168.] 



4. R. ANNULATUM nob. (Odi/nencs,) Appendix to Long's 

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



ODYNERUS Latr. 



1. 0. QUADRISE CTUS. — Black; trunk before and behind, tergum 

 before and a band, white. 



Inhabits United States. 



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

 terval of the antennae, line on the basal joint of the antennje, 

 superior lateral margin of the clypeus and slight spot on base 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 : tergum, first segment 

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

 eating with the black anterior declivity ; second segment with 

 an undulated, dull white band behind, and an obsolete, very small 

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

 short, whitish sericeous hair. 



Length over seven-tenths of an inch. 



1887,] 



