OPYNERUS. 341 



Black, fulvo-vclutinous. The extremity of clypeus and a spot 

 at its summit; a frontal and ocular spot, a post-ocular line, a 

 line under the scape, fulvous-yellow ; the anterior and posterior 

 edge of prothorax narrowly bordered with the same color. A 

 spot under the wing, edge of wing-scales, a line on post-scute 1, 

 and the edges of metathorax margined with fulvous ; segments 

 1-5 of the abdomen regularly margined with fulvous-yellow; 

 fasciae of 1st and 2d segments broader; of the others narrow. 

 Feet black; tibiae yellow anteriorly; tarsi fuscous. Wings 

 smoky. 



Var. a. Last abdominal segments without yellow margin. 



b. Ornaments of the body more yellow. 



a. Clypeus truncate or subbidentate. 



£. Of the same size or smaller; not so much of fulvo-veluti- 

 nous, head argeuteous before. Clypeus ovate-polygonal, longer 

 than wide, bidentate, argenteous-yellow. The hook of antennae 

 black. Inner orbits fulvous. Metathorax generally quite black. 

 The margin of 2d abd. segment more reflexed, more or less cana- 

 liculate ; its base above somewhat subtubereulate. Var. No 

 spot under the wing. Var. sobriniis Sss. — Somewhat more 

 slender. The ornaments of the body bright yellow; no spot 

 under the wing. Metathorax quite black. The abdominal seg- 

 ments all well margined with yellow, the fasciae of medium width. 

 - — 9. Clypeus black or with a yellow spot at its summit; antennae 

 black, the scape yellow beneath. Knees, tibiae, and tarsi yellow ; 

 tibiae blackish beneath. — % . The flagellum of the antennae orange 

 beneath ; knees, tibiae, and tarsi yellow. 



Bess. a. diff. — In livery and size this is just like O. otomifua, 

 but differs by both margins of prothorax being bordered with 

 yellow and its metathorax not rugose, but only finely punctured. 

 It has, like this species, the anus often margined with yellow and 

 the antennae yellow beneath, but the wings are not ferruginous 

 as in this species. 



It resembles 0. propinqmiz, but differs in having the prothorax 

 shorter and the 2d segment too much swelled, with the margin 

 more refiexed. — Compare also (). Peyroti which is a quite allied 

 species, but. with black feet and narrow borders of first segment, 

 and a wide bordering on 2d segment. 



(). Totonacux is a much more slender and naked species. 



Hab. The temperate and elevated parts of Mexico. 1 caught 



