AMERICAN HYMENOPTERA. 93 



thorax broad, scutellum broadly rounded behind, depressed on the disk; pleura 

 prominent on the sides, closely punctured; tegulse polished; wings tinged with 

 fuscous toward apex, marginal cell long, lanceolate, pointed at tip, second sub- 

 marginal cell a little longer and larger than the first, narrowed toward the 

 marginal, receiving the first recurrent nervure near the base and the second 

 near the tip; legs very thinly pubescent, tibiae acute at tip, basal joint of the 

 tarsi as long as the remaining joints together, longer on posterior legs; abdomen 

 ovate, convex, polished, finely and sparsely punctured, with pale pubescence 

 at sides and black at tip; a narrow virhite band on middle of segments 1 — 5, 

 interrupted medially on the first, and more or less sinuate posteriorly on the 

 other segments; apical segment broad, depressed and roughly sculptured; 

 venter flat, nude, minutely punctured, shining, the segments brownish at tip; 

 in some specimens the white bands on segments 2—4 are slightly interrupted on 

 disk, and that on five abbreviated laterally. Length .30 — .40 inch. 



Ilah. — Canada, (Saunders) ; New York, (Comstock). Three speci- 

 mens. 



Stelis? subemargiiiata.— 9 .— Same form and color as nitida, sub- 

 opaque, densely punctured, thinly clothed with pale pubescence, rather dense 

 on face and sides of thorax; scutellum flat, slightly depressed on disk; wings 

 as in nitida, except that the second submarginal cell is much longer and larger 

 than the first, and receives the first recurrent nervure further from the base 

 and the second recurrent nearer the tip; .abdomen oblong-ovate, convex, 

 shining, sparsely and finely punctured at base and more closely and strongly 

 toward apex; segments 1 — 5 each with a narrow white baud on the middle, 

 slightly interrupted on the disk and broadly subemarginate on the sides 

 posteriorly, apical segment flattened, rounded at tip, the last ventral being 

 slightly longer; venter opaque, nude. Length ..35 inch. 



Hab. — Colorado, (Ridings). Two specimens. Closely allied and 

 congeneric with nitida, but differing by the more dense punctation of 

 the head and thorax, and by the form of the abdominal fasciae. A 

 specimen from Illinois, probably only a variety, differs chiefly by 

 the darker wings and by the second recurrent nervure uniting with 

 the third transverse cubital nervure. 



Stelis? SubCHM'ulea. — %. — Robust, blue-black, shining, head and 

 thorax strongly and sparsely punctured, rather thickly clothed with black 

 pubescence, slightly mixed with pale on thorax above, while on the face it 

 is dense and white, with a slight admixture of black; mesothorax with a 

 slightly impressed longitudinal line on the disk and a short one on each side; 

 pleura closely punctured; wings dusky, neuration as in nitida; middle tibiae 

 bispiuose at tip above; abdomen short, convex, almost globose, apex recurved, 

 minutely punctured, polished, a narrow white band on segments 1 — 4, very 

 slightly interrupted on disk, that on fourth segment attenuated laterally and 

 broadly subemarginate on each side of the middle; on the fifth segment two 

 approximate transverse white spots. Length .32 inch. 



Hab. — California, (H. Edwards). One specimen. This is con- 

 generic with elegans Cress., also found in California, but is larger, 

 and much less densely punctured. 



