AMERICAN HYMENOPTERA. 249 



Pubescence cream colored, on the middle and hind tibia? pale ; facial quad- 

 rangle about as broad as long; fimbria fuscous, apacheoruni Ckll. 



Pubescence ochraceous, that on middle and hind tibia? dark fuscous; facial 

 quadrangle a little broader than long; fimbria fuscous. 



americaiia D. T. 



126. Insects rather small, less than 8 mm. in length 127. 



Insects larger, 8 mm. or more in length 144. 



127. Females 128. 



Males 135. 



128. Anal fimbria white or whitish 129. 



Anal fimbria ochraceous, fulvous or fuscous 131. 



129. Head and thorax clothed with pale, yellow pubescence. Wings hyaline, the 



nervures brown. Stigma pale and surrounded by a brown line. 



canadensis D. T. 



Head and thorax clothed with rather long grayish white pubescence. 



Wings with the stigma light brown 130. 



130. Abdomen with complete dense bands of white pubescence. 



albovirgala Ckll. 

 Abdomen with the hair bands on segments 1 and 2 interrupted. 



priniulifrons Casad. 



131. Fimbria ochraceous; the pubescence long and of the same color. Wings 



yellowish-hyaline, iridescent, faintly dusky at tips and with the nerv- 

 ures and stigma honey-yellow miserabilis Cress. 



Fimbria fulvous or subfuscous 132. 



132. Wings with their apices decidedly clouded 133. 



Wings with their apices not clouded 134. 



133. Area at base of metathorax large, coarsely reticulated. 



Robertsonii D. T. 

 Area at base of metathorax not especially large, shortly rugose at base. 



nebecula Sm. 



134. Area at base of metathorax bounded by an impressed line, fiuely roughened. 



Cheeks rather strongly produced behind the eyes. 



nolliiiMiinli Rob. 

 Area of base of metathorax hardly at all defined, roughened. 



melaiiocliroa Ckll. 



135. Wings distinctly clouded apically 135. 



Wings hyaline, their apices not at all clouded or infuscated 140. 



136. Inclosure of metathorax finely roughened, more coarsely so at the base. 



Apical margins of abdominal segments pale testaceous, the hair bands 



white, very thin nebecula Sm. 



Inclosure of metathorax rather coarsely and longitudinally reticulate- .137. 



137. Pubescence of head and thorax fulvous 138. 



Pubescence on head and thorax ochraceous; that on apical margins of seg- 

 ments 2-4 also ochraceous. Wings yellowish-hyaline, iridescent. 



miserabilis Cress. 



138. Fascia? on abdominal segments 3 and 4 continuous. Inclosure bounded by 



a raised rim rugosa Rob. 



Fascia? on abdominal segments 2 to 4 interrupted. Inclosure poorly de- 

 fined laterally, but terminating in a sharp edge at truncation 139. 



TRANS. AM. ENT. SOC. XXIX. (32) AUGUST. 1903 



