314 NOTES ON BUMBLEBEES 



Worker. — Face with black and whitish-yellow pile intermixed, the black 

 pile dominant. Occipital orbits dark, somewhat coarsely and densely punctate. 

 Occiput with a triangular patch of nearly pure whitish-yellow pile. Labrum 

 with tubercle-like areas large and well separated, coarsely punctate; shelf -like 

 projection about one-third as broad as labrum; pile on anterior margin 

 ferruginous. Mandible four-toothed, with numerous minute coarse scattered 

 punctures; setae on distal portion short, on lower proximal margin long, 

 ferruginous. Clypeus well punctate, particularly so in anterior and posterior 

 corners. Malar space somewhat shorter than its width at articulation of 

 mandible, about one-half as long as greatest width of and one-fifth length 

 of eye, nearly impunctate, polished. Ocelli situated just above the narrowest 

 part of the vertex; lateral ocelli as far distant from each other as distant 

 from inner margin of the eye; area just laterad of lateral ocelli impunctate, 

 polished, but becoming well punctate again near inner margin of the eye. 

 Flagellum about one and three-fourths tunes as long as the scape; third 

 antennal segment longer than the fifth, the fifth a trifle longer than the 

 fourth. 



Thorax with dorsal cephalic portion covered with pure yellow pile, the 

 yellow pile extending (except for a little black pile on the middle of its posterior 

 border) caudad to the cephalic margin of the scutellum. Scutellum with 

 pure black pile. Disk of mesonotum bare, impunctate and polished. Meso- 

 pleura, except for the yellow pile of dorsum slightly extending down below the 

 level of the bases of the wings, black. Pile on the metapleura and propodeum 

 black. 



Abdomen with the pile on the first four dorsal segments entirely black, the 

 fifth and sixth dorsal segments with a slight touch of light pile on their lat eral 

 margins. Venter brownish-black. Hypopygium without a median carina. 



Legs black, but with some light ferruginous short setae on tarsal segments. 

 Corbicular fringes black. Hind metatarsi distinctly arcuate. 



Wings very dark, with a slight violaceous reflection. 



Length, 14 mm.; spread of wings, 31 mm.; width of abdomen at second 

 segment, 7 mm. 



Morphotype worker, Oregon. (Collector, C. F. Baker.) De- 

 posited in the collection of the United States National IMuseum. 



Male. Face with pure yellow pile below and with intermixed black and 

 whitish-yellow pile above the articulation of the antermae. Occiputal orbits 

 mostly with dark pile, but that on posterior portion somewhat yellowish, 

 coarsely and densely punctate. Occiput with a triangular jiatch of pure 

 light yellow pile. Malar space slightly longer than its width at articulation 

 of mandible, about one-half as long as greatest width of and one-fourth length 

 of the eye. Ocelli situated just above the narrowest part of the vertex; 

 lateral ocelli as far distant from each other as from the inner margin of the 

 eye. Flagellum about two and two-thirds times as long as the scape; third 

 and fifth antennal segments subequal in length, the fourth nuich shorter than 

 either. 



