330 HYMENOPTE&A OF AMERICA. [PART I. 



Bess. a. cliff. — This species resembles by its livery 0. Pennsyl- 

 vanicus, but it differs by its stronger punctures, its thorax and 

 abdomen shorter ; the former being more square behind. It is 

 in the nearest relationship with 0. perennis. It recalls also 

 Ancistrocerus Sumichrasti. 



Bab. Texas. 1 %. 



130. O. fasciculatus Sauss.— Niger, gracilis, cyliudricus, ubique 



dense punctatus ; prothorace biangulato ; metathorace transverse depres- 

 so-coinpresso, superne rugoso ; canthis lateralibus acutis, lamellaribus ; 

 foveola rhomboidali ; primo abdominis segmento secundo latitudine 

 aeqaali; capitis inaculis, scapo subtus, pronoti margine anlico, tegulis, 

 post-scutelli fascia, metathoracis canthis inferis, abd. segiuentorum 

 10-40 margine, tibiis, tarsisque, flavis.— %. Clypeo fascia arcnata et 

 maculis 2 apicis, flavis. 



Odyn. fasciculatus Sauss. Revue de Zoolog. XXII, 1870, 104, 26, O . 

 Total length, 10.5 mm. ; wing, 8 mm. 



9. Form slender and cylindrical. Head as high as wide; 

 vertex with an angulate groove. Thorax elongate, convex, and 

 cylindrical. Prothorax wide, its angles finely dentiform. Meta- 

 thorax rather compressed transversely, somewhat lamellate on 

 the sides, oblique and posteriorly produced. Its concavity not 

 vertical, but oblique, wider than long, having somewhat of a 

 lozenge form, scarcely strigose ; not margined, limited superiorly 

 by the rugosities of the upper face; its inferior edges compressed, 

 continued with the lateral edges. Abdomen cylindric-depressed, 

 the 1st segment as wide as the second ; anteriorly truncate- 

 rounded, the 2d elongate. Head, thorax, and abdomen densely 

 punctured; the rnetathorax more rugose than the rest; the 1st 

 segment a little more strongly punctured than the mesothorax ; 

 the 2d segment having its margin widely and very slightly cana- 

 liculate, and a little more coarsely punctured than the rest of the 

 segment. 



Black. A line on the mandibles and on the scape of the 

 antennae, a double frontal spot, a dot between the eyes and the 

 antennas, a post-ocular spot, a double spot occupying the anterior 

 margin of prothorax, a little dot under the wing, tegular, a line 

 on post-scutel, and inferior ridges of rnetathorax, golden-yellow ; 

 abd. segments 1-4 adorned with a yellow marginal band; the 

 first two bands rather wide and regular, but having the anterior 

 side rather lacerated; the 3d not so wide; the 4th narrower, 



