140 E. T. CEESSON. 



Scutcllum white; the second, third and base of fourth segments of 



abdomen yellowish ferruginous 116. BelTragei. 



Posterior legs and the second, third and fourth segments of abdomen 



ferruginous 137. rufiveutris, var? 



Wings hyaline or subhyaline. 

 Antennae without pale annulus. 

 Scutellum black. 



Posterior femora black, tibiae yellow, black at tips ; four apical segments 



of abdomen and the head entirely black 122. cervtllns. 



Posterior femora and tibise ferruginous, tipped with black: four apical 

 segments of abdomen black; face with pale lateral mar- 

 gins 12.3. decoratus. 



Posterior femora and tibise ferruginous ; two apical segments of abdomen 

 black; face with pale lateral margins.... 126. limbirrons. 

 Scutellum more or less pale. 



Posterior coxse black, or black and white. 



Postpetiole coarsely granulated, not longitudinally rugose; posterior 



coxae black and white Ambly. electug. 



Postpetiole very coarsely longitudinally rugose, also the three fol- 

 lowing segments; posterior coxae black 117. procas* 



Postjietiole finely, distinctly aciculated. 

 Scutellum flat. 



Posterior femora black; abdominal segments 2 and 3 entirely 



ferruginous; scutellum entirely white 115. restricttlS. 



Posterior femora ferruginous; abdominal segments 2 and 3 fer- 

 ruginous varied with fuscous or black; scutellum white 

 only at apex. 



Face black, clypeus yellow 82. bipnnctatus, var. 



Face entirely yellow Ambly. Quebecensis. 



Scutellum convex 160. iii^itabilis. 



Postpetiole very finely and indistinctly sculptured ; abdominal seg- 

 ments 2 and 3 ferruginous 124. laclirynians. 



Posterior coxse ferruginous 125. citrifrous. 



Antennae with pale annulus. 

 Apical segments of abdomen entirely black. 



Posterior coxae, trochanters and femora black 118. leviculns. 



Posterior coxse, trochanters and femora ferruginous. ..121. liospitiis. 

 Apical segments of abdomen marked with white 120. tiuitiiuus. 



Section VII. — Abdomen ferruginous or fulvous, the first and base or apex of two or 



three following segments more or less black, apex never black. 

 Wings dark fuliginous or black. 

 Antennae without pale annulus. 

 Abdomen ferruginous, segments 1 — 4 more or less black at base; scutellum 



yellow 142. sncciuctus. 



Abdomen ferruginous, first segment only black. 

 Posterior legs entirely black. 



Head large, subquadrate, cheeks convex 135. graudis. 



Head small, subtriangular, cheeks flattened. 



Scutellum black; postpetiole aciculated 137. riifiventris. 



Scutellum with white spot; postpetiole coarsely rugose ; four anterior 

 coxaj white beneath 138. placidus. 



