16G HYMENOPTEBA OF AMERICA. [PART 1. 



abdomine tan t am fasciis 2 liavis ; prima laii-iinia, nigro emarginata, 

 secuuda angusta ; alis fasco-violaceis. 9 • 



Odynerus Spinola Sacss. Vespides, III, 21G, 107 (1S54). 



Total length, 1G uiin. ; wing, 12 mm. 



?. Large, clypeus widely pyrifonn, coarsely cribrose, termi- 

 nated by a little, almost straight, and appearing bituberculate, 

 border. Ocelli large and approaching; upon the vertex a little 

 woolly space. Thorax lengthened. Prothorax neither angulate 

 nor rimmed, having the shoulders only lightly defined. Disk of 

 the mesothorax wide, bearing four longitudinal grooves and a 

 fifth quite feebly marked which occupies the middle of its anterior 

 part. Post-scutel short and truncate, cribrose, and rugose, 

 almost forming a ridge. Concavity of the metathorax surrounded 

 by a salient and trenchant border, forming on each side a sharp 

 spiniform angle and on the summit two yet more distinct angles, 

 separated from the post-scutellum by a groove ; the posterior 

 plate divided into two pentagons by a medial carina. Suture of 

 the first abdominal segment very decided ; border of the second 

 segment smooth, having no larger punctures than upon the 

 remainder of it ; those of the following segmen + s strongly punc- 

 tured. Head and thorax shining, cribrose, with separated punc- 

 tures, metathorax rugose. 



Insect of a shining black, clothed with a <xrav ferruginous pile : 



o » o J o Mr 1 



a spot at the base of the mandibles, one between the antenna?, a 

 dot behind each eye, and two triangular spots on the prothorax, 

 yellow. Antenna? black, ferruginous, or yellow beneath, their 

 scape marked with a yellow line. First abdominal segment 

 entirely yellow above, behind the suture, with a black depression 

 of variable form in the middle; second segment ornamented above 

 by a narrow yellow* border, at times badly limited, slightly 

 mingled with the black, a little interrupted or passing into brown. 

 Feet black; tibia? and tarsi yellow. Wings of a transparent 

 brown ; with dark violet reflections : wing scales brown or black, 

 with a yellow dot. The ornaments are of a lively yellow. 



Bess. a. diff. — This species is easily recognized by its large 

 size, its violet wings, the wide border of its first segment, and 

 that of the second segment at times retracted in the middle and 

 its black clypeus. It is easily distinguished from the 0. unifas- 

 eiatus by its very angulate metathorax and by the border of the 

 second segment, which is not rugose. 



