106 HYMENOPTERA OF AMERICA. [PART 1. 



abdoroine tantnm fasciis 2flavis; prima latissima, nigro eniargiuata, 

 secuuda angusta ; alis fusco-violaceis. £. 



Odyncrus Spinola Sadss. Vespides, III, 216, 107 (1S54). 



Total length, 16 mm. ; wing, 12 mm. 



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

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

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

 woolly space. Tborax 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, formhig 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 segments strongly punc- 

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

 tures, metathorax rugose. 



Insect of a shining black, clothed with a gray ferruginous pile; 

 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. Antennae 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 time- retracted in the middle and 

 its black clypeus. It is easily distinguished from the O. unifqs- 

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

 second segment, which is not rugose. 



