AMERICAN HYMENOPTERA. 253 



177. Faciae on abdominal segments widely interrupted 178. 



Fasciae on abdominal segments white, more or less complete 179. 



178. Insect clothed on thorax with long dense pubescence. The abdominal fas- 



ciae composed of fulvous hairs. Fimbria dark rufous. 



striatifrons Ckll. 



Insects thickly clothed on thorax with short pubescence. The abdominal 



bands composed of whitish hairs, Fimbria fulvous- . . rugosa Eob. 



179. Hair band on segment 2 interrupted 180. 



Hair bands on segment 2, as well as on the others, complete 181. 



180. Wiugs hyaline, nervures and stigma honey-yellow. Fimbria pale fulvous. 



claytonia? Rob. 



Wings hyaline, apical margins somewhat clouded, the nervures and stigma 



testaceous. Fimbria dull ferruginous <| n i ill i lis Rob. 



181. Anal fimbria dull ferruginous. Pubescence on thorax short and thin. 



Forbesii Rob. 

 Anal fimbria fuscous 182. 



182. Wiugs fusco-hyaline, apical margins a little clouded, nervures and stigma 



dull testaceous Cressonii Rob. 



Wiugs yellowish-hyaline, nervures (except black subcostal) and stigma fer- 

 ruginous Maegillivrayi Ckll. 



183. Pubescence more or less ochraceous 184. 



Pubescence white or whitish 190. 



184. Abdominal fasciae reduced to lateral patches 185. 



Abdominal fasciae more or less complete 186. 



185. The fasciae in the form of a fringe on the sides of segments 3 and 4. Fim- 



bria fuscous |» I jui da Sm. 



The fasciae in the form of well-marked patches of white hair on the lateral 

 margins of segments 2-4. Also some scattered glistening yellow hairs 

 across middle of 3 and 4. Segment 5 and fimbria fulvous. 



gramlior Ckll. 



186. The fasciae white 187. 



The fasciae obscure, grayish or yellowish 188. 



187. The pubescence on head and thorax thin and pale ochraceous. Fascia on 2 



interrupted. Fimbria fuscous arabis Rob. 



The pubescence long and dense, ochraceous on dorsum of thorax, elsewhere 

 whitish. Fasciae on 2-4 complete. Fimbria gray-brown. 



sapelloiiis Ckll. 



188. The cheeks strongly produced behind the eyes. Mandibles long and slen- 



der, toothed below at extreme base. Abdominal segments with ob- 

 scure fasciae on their pale testaceous edges. Fimbria fuscous. 



mandibular!* Rob. 

 The cheeks normal, not strongly produced behind the eyes 189. 



189. Abdomen with very distinct pale gray hair bands, all continuous. Wiugs 



clear hyaline, nervures, stigma and tegulae brown. 



electrica Casad. and Ckll. 

 Abdomen with dense apical fasciae of yellowish pubescence on segments 2-4. 

 Wings yellowish-hyaline, nervures, stigma and tegulae dull honey-yel- 

 low viola? Rob. 



TRANS. AM. ENT. SOC, XXIX. AUGUST, 1903 



