272 HYMENOPTERA OF AMERICA. [PART I. 



metathorax very rugose, coarsely cribrose. Fifth segment often 

 bordered with yellow. With the male especially, the fossette of 

 the metathorax does not reach the lateral borders, but is sepa- 

 rated from them mi each side by a band hunched and cribrose with 

 great pits ; the superior ridges are often quite well defined. 



In this species the yellow is clear; often almost orange. 

 The red, the black, and the yellow are susceptible of changing 

 places in the varieties. 



Ress. a. diff. — This species greatly recalls the 0. dorsalis and 

 differs from it by its clypeus ? much wider than long and more 

 grossly punctured; by the clypeus % wider than long, not pro- 

 longed at its anterior extremity, and finely bidentate ; by its 

 smaller size; by its less obscure wings ; by its metathorax less 

 widely concave, becoming rounded and convex on the sides of 

 the posterior plate, while, as with the (). dorsalis, the concavity 

 occupies the whole width; the % differs by the absence of pyra- 

 midal post-scutellar eminences formed by the superior termination 

 of the ridges of the metathorax, and which exist in the dorsalis 

 %. It has greater relationship to the 0. Boscii and Hidahji. It 

 differs from this last by its blunted metathoracic borders, without 

 salient ridges; by the border of segments 2d, 3d, which is im- 

 pressed, rugose, but not turned up; from the first by the scutellum 

 without splits; by the shorter 2d segment; the 3d and 4th more 

 coarsely punctured ; the 4th and 5th without any yellow border. 



Hub. The United States, particularly the south. I possess 

 some individuals from Tennessee, some also from Kansas, from 

 Illinois (Kennicott), and from New York (E. Norton), 7 ?, 10 %. 



93. O. amiecteiis Sacss. — Validus, niger, fulvo-pilosus, clypeo piri- 

 formi nave 4 macula to, apice emarginato; orl>itis partim, pronoti margins 

 antico, (epulis, punctis - scutelli, 2 metanoti, tibiis et tarsis, flavis ; 

 abdominis segmentis, 1° superne flavo, nigro-emarginato, 2 ! , '.)'' margine, 



crasnisshne punctato, anguste flavo-limbato ; alis nigro-violaceis. J. 



Odyn. annectens Sacss. Rev. de Zool. XXII, 1870, 59, 14. £ . 

 Total lengtb, 17 111111. ; wing, 15 mm. 



The following description applies to an insect which seems to. 

 indicate a species different from 0. dorsalis, but is certainly very 

 embarrassing by its similarity. 



9. Size and form of 0. dorsalis; the same sculpture, but not 

 epiite so rough. Clypeus pyriform, more prolonged than in 0. 



