AMERICAN HYMENOPTERA. Ill 



yellowish- white; wings hyaline, slightly dusky at tips, recurrent nervures 

 uniting with the transverse cubital nervures; tarsi with dense white pubes- 

 cence; ventral scopa dense and whitish. Length .35 inch. 



% . — Sides of face, clypeus, broad stripe on mandibles, dot behind summit of 

 eyes, line on scape in front, margins of tegulse, spot in front, interrupted line 

 on posterior margin of scutellum, all the tibiae exteriorly and basal joint of 

 tarsi, all yellowish- white; abdomen marked much as in 9> except that the 

 band on first segment only is interrupted in middle and instead of being 

 emarginate laterally the band is dilated and encloses a small black spot, the 

 sixth segment has a broad transverse mark emarginate at each end, and has a 

 sharp lateral tooth; last segment with a yellowish baud slightly interrupted 

 medially and dilated laterally, the apical margin shaped as in mormonum ; last 

 ventral segment with three spines, the middle one truncate at tip and the 

 lateral ones acute. Length .33 inch. 



Hab. — Colorado, (Ridings). Two specimens. In form and mark- 

 ings this is a miniature of maculifrons Smith, the %> of which, how- 

 ever, has only a single spine at apex of venter. 



Aiithidiiim atriventre. — 9 ■ — Black, clothed with pale pubescence ; 

 face, basal joint of tarsi and venter with fuscous or black pubescence; dot 

 behind summit of eyes, tegulae anteriorly, dot beneath, two or four spots on 

 posterior margin of scutellum, line at base of all the tibiae, and band on 

 abdominal segments 1 — 6, slightly interrupted in middle and emarginate on 

 each side anteriorly, whitish; sometimes the basal band on abdomen encloses 

 a black dot on each side; wings slightly smoky, neuration as in maculifrons; 

 anterior margin of clypeus coarsely denticulated. Length .30 — .35 inch. 



Hah. — California, (H. Edwards). Two specimens. A small species 

 marked much like the preceding, but the pubescence on face and 

 ventral segments is black. 



Anthidium jocosnin. — %. — Black, clothed with whitish pubescence; 

 sides of face, clypeus, mandibles exteriorly except tips, dot behind summit 

 of each eye, tegulae except middle, spot in front, widely interrupted line on 

 posterior margin of scutellum, line on base of all the tibiae, basal joint of tarsi, 

 band on abdominal segments 1 — 6, (gradually broader on apical segments, 

 . . those on 1 — 3 slightly interrupted on middle, that on first segment 



T A interrupted into four spots, that on second segment squarely emar- 



( I Y ginate laterally, and those on third and fourth segments slightly 

 sinuate laterally), and two spots on apical segment, pale yellowish; 

 sixth segment with a sharp lateral tooth; apical segment (see figure) broadly, 

 not deeply, emarginate on posterior middle, with a sharp central tooth, the 

 lateral lobes very broad, rounded laterally and truncated posteriorly; anterior 

 margin subarcuate, smooth; wings faintly dusky at tips, neuration as in 

 maculifrons. Length .30 inch. 



Hah. — Colorado, (Ridings). One specimen. A pretty little species, 

 with the bands on apex of abdomen broad and uninterrupted. 



Anthidium Ridingsii. — 9- — Black, shining; head finely punctured; 

 face, sides of clypeus and cheeks with dense pale pubescence, that on vertex 

 very short and fuscous; mesothorax strongly punctured, with very short 



