AMERICAN HYMENOPTERA. 73 



Nomada zebrata. — 9- — Ferruginous; head and thorax very densely 

 punctured; sides of face, collar, tubercles, tegulse, scutellums, spot on each 

 side of metathorax, and large irregular longitudinal mark on pleura, pale 

 yellow; tips of mandibles black; second and third joints of flagellum sub- 

 equal, the second slightly longer; wings hyaline, dusky at apex; legs pale 

 ferruginous, spot on coxse and knees yellow; abdomen dull ferruginous, an. 

 interrupted band on first segment, a band on the second, third and fourth 

 segments, narrowed in the middle, that on second broadest, and the fifth 

 segment entirely, yellow; venter banded with yellow. Length .40 inch. 



%. — Marked similar to 9 but brighter in color; sides of face, clypeus, spot 

 above, orbits, clypeus, labrum, and mandibles except tips, yellow; scape short, 

 broadly dilated, almost globose, second joint of flagellum much longer than 

 third; spot behind antennae, spot connecting ocelli, and spot at base of meta- 

 thorax black; the yellow on scutellum is generally divided into two spots by 

 a narrow ferruginous line; abdomen with six yellow bands and the venter 

 banded and spotted with yellow ; the head above antennae, the flagellum except 

 base and the mesothorax sometimes varies to black instead of ferruginous, and 

 in two specimens from Kansas the prevailing color of both thorax and abdomen 

 is black. Length .45 inch. 



Hab. — Colorado; Kansas, (Ridings). Six specimens. The % of 

 this species is readily distinguished by the short dilated scape. 



JVomada opposita. — 9 -—Pale ferruginous, head and thorax very densely 

 punctured, clothed with pale pubescence; sides of face, clypeus, spot above, 

 labrum, base of mandibles, collar, tubercles and postscutellum, yellow; tips 

 of mandibles, line connecting ocelli, anterior suture of thorax narrowly and 

 the metathorax, except a large ferruginous mark on each side enclosing a 

 yellow spot, black; antennae entirely pale ferruginous, third and fourth joints 

 equal in length; scutellum bilobate pale ferruginous; wings dusky at tips; 

 abdomen minutely punctured, apical margin of the segments narrowly fuscous, 

 a spot on each side of third segment, and broad band on fourth and fifth 

 segments, yellow; venter varied with yellow. Length .38 inch. 

 Hab. — California, (H. Edwards). One specimen. 



Nomada adducta. — % . — Head ferruginous, closely punctured; large spot 

 on vertex extending more narrowly back to occiput covering ocelli, posterior 

 margin of head and tips of mandibles, black; sides of face, clypeus and base of 

 mandibles, yellow; antennae rather short, fuscous, paler beneath, scape short, 

 dilated, ferruginous at base; third joint slightly longer than fourth; thorax 

 black, densely and strongly punctured; a large mark on each side of meso- 

 thorax, the scutellums and most of pleura, ferruginous; scutellum bilobate; 

 metathorax not distinctly sculptured, the sides with patch of silvery pile; an 

 obscure yellowish line on each side of collar ; tegulae and tubercles, ferruginous ; 

 wings hyaline, fuscous at extreme tips; legs ferruginous, base of coxae and of 

 femora more or less, spot at tip of posterior tibiae and base of their tarsi, black; 

 abdomen closely punctured, ferruginous, immaculate except a black band on 

 first segment and a dusky spot on each side of second; extreme lateral apical 

 margin of the segments and apex with white pubescence. Length .36 inch. 



Hab. — Colorado, (Morrison). One specimen. The scape resembles 

 that of zebrata in shape, although not so much dilated. 



TRANS. AMER. ENT. SOC. Vll. (10) MARCH, 1878. 



