66 PROCEEDINGS OF THE NATIONAL MUSEUM TOi,. 75 



151. Clypeus black or marked with black 152. 



Clypeus uot marked with black 173. 



152. Apical part of the terminal sef,'ment of all tarsi black above ; no black above 



elsewhere on tar.si torosa. 



Apical part of the terminal .segment of all tar.si not black above; or if .so, 

 then other parts of tar.si also black above 1.53. 



153. Fasciae on all tergites interrupted medially 106. 



All or at least .some of the fasciae on tergites continuous 154. 



154. Anterior metatarsus dilatetl and flattened (tig. 219) 1.55. 



Anterior metatarsus normal 156. 



155. Dorsum of propodeum bearing a well-developed fascia borneana. 



Dorsum of propodeum without fascia palmata. 



156. Fasciae on tergites 1-5 continuous, or all continuous except that on 



fifth tergite 157. 



Fasciae, except that on first tergite (and sometimes that on fifth tergite 

 also), continuous 168. 



157. Labrum black or with medial black stripe 158. 



Labrum not marked with black 159. 



158. Sides of thorax with conspicuous maculations levis. 



Sides of thorax black or with only inconspicuous pale maculations velox. 



159. Scape entirely black 160. 



Scape with maculation below, sometimes very small 161. 



160. Scutum with unbroken U-shaped discal mark ; raesopleura bearing large yel- 



low maculation nigrocornuta. 



Scutum with pair of discal lines (rarely with broken U-shaped mark) ; 

 mesopleura black or with small spot below wings oculata. 



161. Second and third steruites with broad fasciae seculata. 



Second and third sternites with lateral spots (sometimes connected by 



fine apical lines) 162. 



162. Frons wider than the eye viewed from iu front ; that is, the frons makes 



up nioi'e than one-third of the total width of the head 1(33. 



Frons not wider than the width of tlie eye seen from in front orientalis. 



163. Posterior orbits very broad and above extended mesad on the occiput be- 



yond the inner margins of the eyes at the vertex; proboscis when at i-est 

 not wholly retracted beneath the labrum spiritalis. 



Posterior orbits not usually broad and not extended beyond the inner 

 margins of the eyes; proboscis when at rest completely retracted be- 

 neath the labrum 164. 



104. Length 18-20 mm melancholica. 



Length less than 18 mm 165. 



165. Fasciae on tergites yellow; first roundly biemarginate on anterior dorsal 



border borrei. 



Fasciae on tergites pale ; first not biemarginate on anterior border. 



opinabilis. 



166. Black on clypeus in form of basal spots, entirely separate or united at 



base of clypeus ; terminal segment of tarsi without dusky spot above_167. 

 Klack on clypeus a solid band or covering the entire clypeus ; terminal seg- 

 ment of tarsi with du.sky .spot above multipicta. 



167. Lateral spots on sternites pron)inent and extending along apical margin of 



sternite toward midline or joined by apical lines frioensis. 



Lateral spots on sternites much reduced or lacking ; not connected by apical 

 lines pugillatrix. 



