AMERICAN HYMENOPTERA. 81 



yellowish; disk and lateral margin of metathorax and spot on each side of 

 prothorax black; wings hyaline, narrowly fuscous on apical margin; abdomen 

 yellow above, the apical margin of the segments ferruginous; first segment 

 ferruginous with a narrow interrupted yellow band, more or less indented 

 anteriorly and posteriorly. Length .40 inch. 



Hah. — Colorado, (Ridings). Four specimens. 



NoinaciA ptirata. — 9- — Ferruginous, opaque; head and thorax strongly 

 punctured, densely and confluently so on mesothorax; two spots behind 

 antennae, line connecting ocelli, posterior margin of cheeks, narrow stripe on 

 disk of mesothorax ending in a spot on anterior and posterior margins, sutures 

 of pleura narrowly, spot on each side of prothorax and broad stripe on middle 

 of metathorax, black; flagellum dusky toward apex, second joint shorter 

 than third; sculelluin strongly bilobate, shining, sparsely punctured; tegulse 

 polished with a few scattered punctures; wings subhyaline, narrowly fuscous 

 on apical margin; femora and tibiae more or less black behind; abdomen 

 opaque, densely and minutely punctured, ferruginous, basal half of first seg- 

 ment black, a small yellow spot on each side of middle, segments 2 — 4 each 

 with a very broad yellowish-white band, those on two and three slightly 

 indented on each side posteriorly, fifth segment entirely yellowish-white; 

 venter immaculate. Length .45 inch. 



Hah. — Colorado, (Ridings). One specimen. This and tlie pre- 

 ceding species are closely allied, but may be easily separated by the 

 tegulse, which in Uhata is larger, coarsely sculptured and opaque. 



Nomada pacata. — 9- — Ferruginous, opaque; head and thorax strongly 

 and confluently punctured, the face finely punctured; a spot or line on lower 

 anterior orbits, two spots at base of metathorax, sometimes wanting, and 

 occasionally two spots on pleura, yellow; dot on each side of clypeus, tips of 

 mandibles, two spots behind antennae sometimes confluent with spot enclosing 

 ocelli, posterior margin of cheeks, collar, sutures of the thorax broadly, a stripe 

 on middle of mesothorax, sometimes a stripe on each side, pleura beneath, and 

 broad stripe on middle of metathorax, black; antennae robust, scape narrowed 

 at base, third joint short, rather more than one-half the length of third; 

 scutellum prominently bilobate, shining, sparsely punctured ; tegulae pale fer- 

 ruginous, shining; wings dusky at tips, with the usual pale spot before the 

 darker apical margin; legs ferruginous, with the coxae, femora and tibiae more 

 or less black behind; abdomen varied with ferruginous, shining, a yellow band 

 on segments 1 — 5, all more or less interrujjted in middle, that on first segment 

 narrow and undulate anteriorly, sometimes subobsolete, that on second seg- 

 tnent broad laterally and narrowed within, all slightly indented on each side 

 posteriorly, those on fourth and fifth sometimes enclosing a fuscous spot; venter 

 ferruginous, sometimes spotted with yellow at apex. Length .32 — .35 inch. 



Hah. — Colorado, (Ridings). Three specimens. 



Nouiada Crotcliii. — 9 -—Head opaque, black, thickly clothed with a 

 short pale pubescence, lower corners of face, anterior margin of clypeus, 

 labrum, base of mandibles and spot at summit of each eye, whitish; anterior 

 and posterior orbits obscurely ferruginous; antennae fulvo-testaceous beneath, 

 third joint a little shorter than fourth, both together being longer than scape 



TRANS. AMER. ENT. SOC. VII. (11) MARCH, 1S78. 



