194 HYMENOPTERA OP AMERICA. [PART I 



9. Of a shining black, closely allied to the form of the 0. 

 Aztecus, but larger, and with the whitish markings more 

 developed. Upon the vertex two tubercles of brown hair. Body 

 equally cribrose with great punctures, but the metathorax insen- 

 sibly retracted behind; and its vertical plate a little more elevated. 

 The second segment a little more swelled above, so as to imitate 

 a sort of indistinct tubercle. Mandibles often spotted with 

 yellow at their base. Clypeus black, ornamented toward the top 

 with two lateral yellow lines, its inferior extremity truncate and 

 cut out into a furrow rather than a groove. A line on the scape 

 of the antenna', a spot on the forehead, two great triangular spots 

 on the prothorax, a spot beneath the wing, two dots on the wing 

 scales, post-scutel, two great slashed spots on the metathorax and 

 the border of the first two segments of the abdomen, whitish. 

 The first segment yellow above, with a triangular black spot or 

 having at least two lateral spots reunited with the bordering. 

 Wings brown with violet reflections. 



%. Clypeus of the same form with that of the female, offering 

 at the summit a white arc and below two white lengthened spots 

 (or almost entirely white) ; this color terminates toward the 

 bottom in four teeth and often presents in the middle a black dot. 

 Hook of the antennae ferruginous. No little hairy rnauiinae on 

 the vertex. 



Far. a. Two yellow spots on the scutellum. 



h. Post-scutel black. Two yellow spots on the prothorax and 

 two on the metathorax : only two yellow spots on the border of 

 the second segment of the abdomen (Sauss. Yespides, III, pi. ix, 

 fig. !>). This last variety may be noted as like that of St. Marte 

 in Columbia, in South America. It may very well be a distinct 



species from the 0. i-SedUS. 



I Inl). The Tinted States, especially at the South. I possess 

 specimens taken in Louisiana, Florida, Carolina, Tennessee, 

 Pennsylvania. 



Ress. a. (Jiff. — This species differs from the 0. Aztecus, by 

 the entire border of the clypeus, by its black antenna? and feet, 

 by its greater size, and by its always more extended ornaments. 

 These are in general whitish, at times of a pale golden. It bears 

 a great resemblance at times to the 0. luctuosus. 



