328 HYMEN OPT ERA OF AMERICA. l PAIIT L 



the eye, a post-ocular dot, an interrupted fascia on the prothorax, 

 a spot under the wing, post-scutel and margin of segments 1, 2, 

 4, tarsi, and tibia?, yellow. Tegula? ferruginous ; wings subhya- 

 line ; nerves brown ferruginous ; the radial cell smoky. 



%. Antennae ferruginous beneath; clypeus punctured, poly- 

 gonal, shortly bidentate, yellow. 



Va?\ a. The yellow margin of the 4th segment incomplete. 



b. Segments 5, 6 margined with yellow. 



c. The 3d obsoletely margined. 



d. Only two yellow dots on prothcrax. 



e. Wing scales % black. 



f. Anterior tibia? maculate with black. 



g. Ornaments S luteous. 



h. Clypeus % black on its inferior part. Flagellum of the 

 antenna? % quite black. (Louisiana.) 



Bess. a. cliff. — May be a variety of 0. pedestris?. 



Hab. United States. New York, Illinois, "Wisconsin, Louisiana. 



12S. O. pereilllis Sadss. (Fig. 25.) — Sat minutus, niger, elongatus, 

 gracilis, crassissime punctatus, secundo segmento angusto, elongate- ; 

 corpore flavo-variegato ; capite paene altiore quam latiore; metanoto et 

 abdominis prirao segmento grosse foraininato-punctatis ; abdominis 

 seginentis 1°, 2° late rlavo-marginatis. 



Odi/n. perennis Sauss. Revue Zool., IX, 1857, p. 277. 



Total length, 9 mm. ; wings, 7 mm. 



Form almost precisely as in 0. pedestris, but the body more 

 coarsely punctured. 



9. Head a little higher than broad, not so densely, but more 

 coarsely punctured. Punctures of clypeus larger. Those of 

 thorax very coarse. Those of metathorax and the first abdominal 

 segment still larger, very rough. Those of the top of metathorax 

 somewhat reticular. First abd. segment not quite as wide as 

 the 2d, rather depressed above. Second segment yet strongly 

 punctured, but much less than t he 1st segment; its margin more 

 coarsely, but not so strongly punctured as the 1st segment, not 

 canaliculate; its base rather constricted, making it seem almost 

 tuberculate. 



Black. A spot on mandibles, the top of clypeus, scape 

 beneath, a frontal spot, a spot in the sinus of the eves and a 

 post-ocular dot, a wide marginal band on prothorax and on the 



