;;14 HYMENOFTERA OF AMERICA. [ PART I. 



1 Hi. O. vagus Sauss. — Elongatus, gracilis, punctatissimus ; flavo- 

 variegatus ; abdomiuis segmentis 1-2, vel 1-4, liavo-limbatis ; primo 

 iusuper fascia iiiterrupta liava-, secuudo punctis 2 liberis liavi.s, niar- 

 gine subcanaliculato, crassiua punctato, 9 . 



Odyn. vagus Sacss. Revue et Mag. de Zool. IX, 1857, 277, $?• 



Total lengtb, 11-12 mm. ; wing, 9 mm. 



9. The whole insect coarsely punctured. Head wider than 

 high. Clypeus pyriform, subbidentate. Prothorax slightly 

 angulate. Metathorax not very rugose superiorly, presenting on 

 each side of post-scutel a little flat place; its posterior lace 

 excavated, but the fossette not margined by ridges; the margins 

 quite rounded and rugose. First abdominal segment rounded 

 anteriorly, cribrose with coarse punctures, which continue at some 

 distance on the anterior face; 2d segment very little wider than 

 the first, quite cribrose with punctures, not quite so coarse as on 

 the first segment, except on the margin, where they become just 

 as coarse; the margin is also very slightly canaliculate. Beneath, 

 the 2d and 3d segments are cribrose with large punctures, which 

 are variable or effaced. 



Black. Antennas black, with a yellow line on the scape. An 

 arcuate line on the summit of clypeus, a macula at base of man- 

 dibles, a frontal spot, a spot on the sinus of the eyes, and a post- 

 ocular line, yellow. Two spots on prothorax (or a submarginal 

 interrupted bi-arcuate band), a spot under the wing, tegulsa, and 

 their appendix, a band on the post-scutel, and the edges of meta- 

 thorax, bright yellow. The 3d— 4th abdominal segments narrowly 

 margined with yellow, the 2d more broadly; the lsl segment 

 adorned in addition with two oblique lateral lines (or an inter- 

 rupted transverse fascia on its middle, near the base), and the 2d 

 with two lateral yellow or rufous spots. The margin of the first 

 wider in the middle, narrower on the side. 



Legs black; knees, tibiae, and tarsi yellow or ferruginous. 

 Wiiii:'- subhyaline or smoky. 



Var. a. Clypeus black, with two yellow dots on its summit and 

 often two at its apex, or yellow, with a black triangle. 



b. All ilie abdominal segments margined with yellow. 



r. Only the first two segments margined with yellow. 



d. The edge of 2d segment a little rellexed. 



