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 on 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 

 {daces in the varieties. 



Bess. a. cliff. — This species greatly recalls the 0. dorsalis and 

 differs from it by its clypeus 9 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 0. 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 w T hich exist in the dorsalis 

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

 differs from this last hy 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 spots ; by the shorter 2d segment ; the 3d and 4th more 

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



Bab. 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), T 9 , 10 % . 



93. O. annectens Sauss. — Validus, niger, fulvo-pilosus, clypeo piri- 

 formi flavc 4 maculato, apice emarginato ; orbitis partim, pronoti margin e 

 antico, tegulis, punctis 2 scutclli, 2 metanoti, tibiis et tarsis, Davis ; 

 abdominis segmentis, ]P superne flavo, nigro-emarghiato, 2', 3' margine, 

 crassissinie punctato, anguste flavo-limbato ; alis nigro-violaceis. 9 • 



Odijn. annectens Sauss. Rev. de Zool. XXII, 1870, 59, 14, 9. 



Total length, 17 mm. ; 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 

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



