AMERICAN HYMENOPTERA. 133 



Second segment fulvous, a whitish band at tip of segments three, four and six; 



legs fulvous or ferruginous 102. juciindiis. 



All the segments with a yellow band at tip. 



Coxal seopa distinct; face yellow 90. zcbratll!<i. 



Coxal scopa wanting; face black 97. iltrit'roiiiii. 



Section III. — Abdomen ferruginous, apex black. 



Coxal scopa distinct 113. volesus. 



Coxal seopa wanting. 



Scutellum entirely black 114. iiivollitii!i$. 



Scutelluni whitish or ferruginous. 



Antennae slender, basal joints of flagellura elongate cylindrical. 



Thorax entirely black IfiO. inf^tabilis. 



Thorax black; mesothorax and large mark on pleura ferruginous ; apex 



of abdomen with j)ale spots 119. terilliuali»$. 



Thorax entirely ferruginous. 



Third joint of antennae double the length of fourth. 



Apex of abdomen without pale spot; tip of segments two to four 



black 1.32. iiideiiiiiis. 



Apex of abdomen with pale spot; segments one to three entirely 



ferruginous l.'ili. catitlatiis. 



Third joint of antennae scarcely longer than fourth ; apex of abdomen 



with pale spot l."54. putllS. 



Antennae with short, thick-set subquadrate joints. 



Abdomen with segments one to three ferruginous, base of third with 



black band 127. vecors. 



Abdomen with segments one to three or four entirely ferruginous. 

 Four anterior femora unusually swollen. 



Apex of abdomen without pale spot 128. nigrovarie$;atiiN. 



Apex of abdomen with pale spot 129. Itliiiiilif^. 



Four anterior femora not unusually swollen. 



Size medium; legs, except coxae and trochanters, entirely fer- 

 ruginous i:}l. seditiosus. 



Size small ; posterior femora and tibiae marked with black. 



Apex of abdomen black, immaculate 121. liospitilK. 



Apex of abdomen with pale spot I.'i0. tiiiili<lirroil!<. 



Section IV. — Abdomen ferruginous or fulvous ; thejirst and base or apex of two or 



three following segments sometimes more or less black. 

 Wings fuliginous. 

 Coxal scopa distinct. 



Thorax black \?,h. graiKliN. 



Thorax ferruginous; sutures of abdominal segments strongly constricted; 



head unusually large 149. lrogilbrini»i. 



Coxal scopa wanting. 

 Thora.x black. 



Posterior legs entirely black. 



Antennae short, inv(dute 1.30. iiiiirbaiiliK. 



Antennaj long, slender 137. riifivi'iif riN. 



Posterior legs blaek, their tibiae white at base 139. <leviii<*t<>r. 



Posterior legs black, their tibiae dull-ferruginous 140. livi<lillu!<. 



