246 AMERICAN HYMENOPTERA. 



Ocelli small, placed near the supra-orbital line, above the narrow- 

 est part of the front ; the lateral ones about equidistant from 

 the eyes and from each other vag^ans. 



56. With a very large black patch or band on dorsum of thorax be- 



tween the wing bases 57. 



With at most only a small black patch in this location vagans. 



57. Second abdominal segment bearing black pile above fernaldi. 



Second abdominal segment bearing yellow pile above 58. 



58. Pile on scutellum distinctly darker than that on the front part of 



the thorax above ambiguus. 



Pile on scutellum not darker than that on the front part of the 

 thorax above 59. 



59. Malar space distinctly longer than its width at apex ; face with a 



conspicuous amount of yellow pile about the bases of the 



antennae cockerelli. 



Malar space not distinctly longer than its width at the apex ; face 

 without a conspicuous amount of yellow pile couperi, 



60. Hairs fringing corbiculae with a more or less distinctly ferruginous 



tinge 61. 



Hairs fringing corbiculae black or mostly so 69. 



61. Yellow pile of pleura extending to bases of legs kirbyellus. 



Yellow pile not covering pleura to bases of legs 62. 



62. Apical segments of abdomen bearing white pile 63. 



Apical segments of abdomen not bearing white pile 64. 



63. Hairs fringing corbiculae strongly ferruginous ; face with a rather 



faint touch of yellow about and below the bases of the an- 

 tennae occidentalis. 



Hairs fringing corbiculae usually with only a slight tinge of ferru- 

 ginous ; face without a yellow touch. 



terrestris var. moderatus. 



64.- Malar space longer than it is wide at the apex 65. 



Malar space not longer than it is wide at the apex 68. 



65. Pile short and dense ; black pile covering a part or all of the dor- 



sum of the second abdominal segment califoriiicus. 



Pile long and loose ; second abdominal segment above entirely 

 covered with yellow pile 66. 



66. Clypeus almost impunctate ; very smooth and shining polaris. 



Clypeus somewhat strongly punctate 67. 



67. Pleura almost entirely dark kincaidii. 



Pleura light, except lower half streuiius. 



68. Face usually with a noticeable touch of yellow ; western, mostly 



Californian occidentalis-nigroscutatus. 



Face usually without a noticeable touch of yellow ; eastern. 



terricola. 



69. Yellow pile of pleura extending to bases of legs 70. 



Yellow pile of pleura not extending to bases of legs 79. 



