AMERICAN HYMENOPTERA. 205 



Ulelecfa? mncida. — %. — Small, black; head and thorax densely clothed 

 with a rather long cinereous pubescence, that on sides of face, occiput and 

 anterior margin of mesothorax, varied with fuscous; scape pubescent, flagellum 

 nude, robust, filiform; disk of thorax and scutellum almost nude, the latter 

 strongly bilobate, and on each side a tuft of short black pubescence; tegulse 

 testaceous; wings hyaline, broadly fuliginous at apex, a dusky spot in second 

 submarginal cell, also one in the third discoidal cell, the transverse nervure 

 dividing the second and third submarginal cells is absent in both wings, thus 

 making the second submarginal as long as the marginal and receiving both 

 recurrent nervures, the second in the middle; tibiae and base of tarsi more or 

 less clothed with cinereous pubescence; abdomen convex above, covered with 

 a short dense appressed cinereous pubescence. Length .33 inch. 

 Hab. — Nevada, (Morrison). One speciiueu. 



Stelis interrupta. — 9. — Small, black; the face, sides of thorax and 

 legs clothed with cinereous pubescence, that on the head and thorax above 

 black and sparse; tegulse piceous, wings hyaline, dusky on apical margin; 

 abdomen short, convex, almost globose, shining, segments 1 — 5 each with a 

 narrow whitish band on the middle, all interrupted medially and more or less 

 90 on each side; venter nude, immaculate. Length .22 inch. 

 Hab. — Nevada, (3Iorrison). One specimen. 



Heriades ? rotnndiceps. — 5 . — Black, strongly and rather closely 

 punctured; head broad, almost as large as the thorax, long and prominent 

 behind the eyes and ocelli, face and cheeks clothed with white pubescence, 

 that on the vertex thin and pale fuscous; clypeus truncate in front, mandibles 

 with a patch of short dense yellowish pubescence near tips; thorax clothed 

 with \tfhite pubescence, that on scutellum long, and that on mesothorax short 

 and sparse; wings hyaline, marginal cell long, lanceolate, pointed at tip, 

 second submarginal cell a little shorter than the first, narrowed about one- 

 half towards marginal, receiving the first recurrent nervure about one-fourth 

 from the base and the second near the tip; legs clothed with pale pubescence; 

 abdomen convex, about as long as head and thorax taken together, a fringe of 

 short dense white pubescence at apex of the segments; ventral scopa white or 

 very pale ochraceous. Length .27 — .30 inch. 



Hab. — Nevada, (Morrison) ; Oregon, (Edwards). Ten specimens. 



Heriades ? ciibiceps. — 9.— Black, head and thorax strongly punc- 

 tured, sides of face and thorax clothed with whitish pubescence; head very 

 large, quadrate, larger than thorax, full and prominent behind the eyes; 

 middle of clypeus smooth and polished, apical margin deeply emarginate and 

 crenulated; mandibles large and pubescent above; cheeks unarmed; wings 

 clear; legs slender; abdomen small, convex, shining, feebly punctured, the 

 segments narrowly fringed at apex with short white pubescence; ventral scopa 

 white. Length .30 — .35 inch. 



Hab. — Nevada, (Morrison). Four specimens. 



Autliidiuiu einai*{;iiiatuni Say. — % variety atripes. — Legs entirely 

 black; the white bauds on abdomen more deeply emarginate and interrupted, 

 the fifth segment with only two dots, the two apical segments entirely black. 

 Length .45 inch. 



Hab. — Nevada, (Morrison). One specimen. 



