152 HYMENOPTERA OF AMERICA. [PART I. 



One finds in America and in Europe some corresponding 



species, so to speak, which reproduce in each country the same 

 forms and the same distribution of colors. 



a. Segments 1-4 of the abdomen bordered with yellow. 



1. S. Walsliianus ri. sp. — Niger, punctatus, gracilis, postscutello et 

 metanoto rugosis; mesonoto sparse, scutello crassius, abdominis prinio 

 segmento grosse, punctatis ; pnncto frontali et post-oculari, macnlis 2 

 pronoti, 2 scutelli et utrinque 1 subalari, tegnlis abdominisque segmen- 

 torura 1-4 limbo, flavis ; tibiis et tarsis flavis ; alis fusco-nebulosis. 



9 . Macula in sum mo clypeo fiava. 



Total length, 12 mm. ; wing, 10 mm. 



9. Of a larger size than the 0. Philadelphia, bnt of a similar 

 form. Clypeus bidentate, punctured, and rugose toward the 

 base. Thorax less lengthened than in the species cited above. 

 Prothorax finely rimmed but not bidentate. Head and thorax 

 quite densely punctured ; the punctures effaced on the summit 

 of the mesothorax, which bears only some scarce punctures and 

 which is traversed by two grooves in its whole length. Clypeus 

 cribrose with points which are coarser, but separated and few, 

 indistinctly divided by a groove. Post-scutel and metathorax 

 very rugose ; the first presents, on its anterior border, a feeble, 

 r.ugose, divided projection, which does not extend as far as the 

 angles. Plate of the metathorax strongly rimmed but not biden- 

 tate. Abdomen shining. The first segment coarsely cribrose 

 above with large punctures and divided by a groove; its suture 

 very strong; the first moiety of the 2d segment, its extremity, 

 the 3d, and the 4th, punctured. 



Insect black, clothed with a short grayish pile. A spot on 

 the summit of the clypeus, a mark between the antennas, a little 

 point behind the summit of the eyes, an interrupted lino on the 

 scape of the antennas, two spots on the prothorax, one beneath 

 the wing, two on the scutellum, and the border of the segments 

 1-4 yellow; the bordering of the first two a little festooned, 

 especially that of the first, which is a little enlarged in the middle. 

 Wing scale yellow, with a testaceous point. Legs black; knees, 

 tibiae, and tarsi yellow; the last article of the tarsi brownish. 

 Wings smoky, with light violet and golden reflections. 



The markings are of a golden yellow. 



%. Unknown. 



