330 HYMENOPTERA 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 tlie nearest relationship with 0. perennis. It recalls also 

 Ancistrocerus Sumichrasti. 



Hub. Texas. 1 £>. 



ISO. O. fasciCtllatus Sauss.— Niger, gracilis, cyliiidricus, ubiqae 



dense punctatus ; profhorace biaugula-to ; metathorace transverse depres- 

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

 foveola rhomboidali ; primo abdominis segmento seonndo latitudine 

 sequali; capitis macalis, scapo subtus, pronoti margine anlico, tegulis, 

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

 IO-40 margine, tibiis, taisisque, flavis.— £. Clypeo fascia arcuata et 

 maculis 2 apicis, flavis. 



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

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



?. 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 metathorax 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 

 antenna?, a double frontal spot, a dol between the eyes and the 

 antenna?, a post-ocular spot, a double spot occupying the anterior 

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

 on post-scutel, and inferior ridges of metathorax, 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, 



