Fossoricd ITymencptcra of North America. 3GH 



streak on upper side of the tip, tibiae and tarsi yellow; hind femora 

 wholly browu, tibiae yellow, with an external broad-oval, lanceolate 

 spot, likewise shaded with brown internally. 



Abdomen black, on upper side of basal ring a pair of rather nar- 

 row, arcuate yellow spots, succeeded by thin spots, one on each ring, 

 straight and tapering towards the median line of the body; the three 

 last pairs of spots form nearly connected bauds, especially the fifth 

 pair which cover the posterior half of the ring. Tip yellow, finely 

 hirsute. 



Length of body, .34; head and thorax, .16; abdomen, .18 inch. 



This is a smaller species than any of the preceding, and can be 

 easily distinguished by the shape of the vexhillum, which is consider- 

 ably smaller than in T. stgnifer, and by the simple antennas. 



9 . A 9 specimen which in Dr. Harris' notes is referred with some 

 doubt to the present species, differs beside the usual sexual characters 

 in having the scape of the antennae entirely yellow. The prothoracic 

 fasciae are united on the median line. The thorax is sculptured the 

 same, and the legs are colored in much the same way. The trochan- 

 ters and femora are dark brown, tibia? and tarsi yellow, femora shaded 

 slightly with brown inside; middle and hind coxae, trochanters and 

 femora brown-black; hind tibiae yellow, wanting the outer dark spot, 

 but brown within. Abdomen colored the same, the fasciae being, 

 however, a little heavier ; tip fuscous. 



Length, .40, head and thorax, .19; abdomen, .21 inch. 



Its cylindrical slender scape, rounded hind edge of the enclosure of 

 the propodeum, and the broad, heavy fascias, will further distinguish the 

 females of this species. 



Thyreopus discifer, n. sp. 



% . Head subcubical, transversely oblong, being a little more than 

 half as long as broad, vertex flat and broad, front broad, rounded and 

 narrowing a little towards the insertion of the jaws; surface more 

 coarsely punctured than usual, piceous black ; antennae with the scape 

 plainly clavate, entirely yellow; flagellum short and thick, a little 

 thickened in the middle, but not towards the tips ; joints very short and 

 slightly flattened, though not concave or denticulate, terminal joint 

 very short, conical. Orbits silvery, clypeal region broad and long, 

 silvery; mandibles black. Thorax stout, rather coarsely punctured, 

 entirely piceous black, except two remote spots on the thorax, which 

 is angulated on each side. Propodeum with the triangular enclosure 

 very distinct, with a median, broad ovate, six-sided groove, much 



