AMERICAN HYMENOPTERA. 113 



posteriorly, and two large rounded spots on apical segment, all lemon-yellow; 

 ^ ^ , the bands on segments 4—6 are broad, even, and slightly inter- 



lT _~\ rupted on middle; sixth segment with a long acute lateral spine; 



(J^rrTV) last segment (see figure) broadly and deeply emarginate at tip, 

 ^ * ^ with a stout acute central spine, as long as lateral lobes which 

 are obliquely sinuate on outer sides and spiniform within; anterior margin of 

 clypeus strongly arcuate and smooth; wings smoky, the second submarginal 

 cell receives the first recurrent very near the base, while the second passes a 

 little beyond the tip. Length .55 inch. 



Hah. — Colorado, (Ridings). One specimen. Quite distinct by its 

 markings and shape of anal segment of abdomen. 



In this and all the following species of this genus, the second recur- 

 rent nervure passes beyond the apex of the second submarginal cell. 



AntllidiuiU venustuill.— 9 .— Black, clothed with yellowish pubes- 

 cence; anterior orbits broad on sides of face, line on posterior orbits, two 

 spots on clypeus sometimes confluent on anterior margin, two spots on anterior 

 margin of mesothorax, tegulse anteriorly, spot beneath, posterior margin of 

 scutellum interrupted into a spot on each basal corner, knees, line on anterior 

 femora beneath, all the tibife exteriorly, their tarsi, and band on abdominal 

 segments 1 — 6, all yellow; the bands on segments one and two interrupted into 

 three spots, the middle spot on second segment being subinterrupted in middle 

 and notched at each end; the bands on remaining segments slightly inter- 

 rupted medially and rounded, that on third segment emarginate on each side 

 posteriorly, while those on the two following segments enclose a short black 

 line on each side; the band on sixth segment notched at each end; tubercles 

 formed into a large broad concave scale, rounded laterally and strongly reflexed 

 anteriorly; wings fuliginous; posterior coxse with a stout yellow tooth at apex 

 beneath; anterior margin of clypeus strongly denticulate; mandibles very 

 robust; abdomen strongly and sparsely punctured; ventral scojaa pale yel- 

 lowish. Length .40 — .45 inch. 



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

 related to interruptum Say, but larger. 



AntllidiuiU texanuiU.— 'S -—Black, densely punctured; sides of face, 

 clypeus, narrow anterior orbits, short line behind summit of eyes, and the 

 mandibles, yellowish; sides of face and occiput with pale ochraceous hair; 

 anterior margin of clypeus denticulated; thorax more densely punctured than 

 head; a spot on each side of mesothorax anteriorly, posterior margin of scu- 

 tellum, inlerrupted medially, and the tubercles (which have a thin recurved 

 margin anteriorly, yellow or fulvous; sides of metathorax and pleura clothed 

 V I , L If I with a pale ochraceous pubescence ; tegulse fer- 



V~--^--^ /■ — I { S 1 { ruginous with a yellow spot in front; wings 



\1/ \y^^r^ V-rJ/v^ fuliginous, paler beneath marginal cell which 



I 2 3 is dark fuliginous; legs fulvo-ferruginous, pos- 



terior knees, tips of their tibiae and basal joint of their tarsi, yellow; abdomen 

 shining, sparsely and strongly punctured, first segment tinged with ferrugi- 

 nous; a rather broad yellowish-ferruginous band near apex of segments 1 — 5, 

 those on one and two indented on anterior middle, and those on 3 — 5 inter- 



TRANS. AMER. ENT. SOC. VII. (15) MARCH, 1878. 



