Bullctm of Laboi'atories of Denison University [Voi. xi. 
61. Males, abdominal bands narrow, inconspicuous, dull yel- 
low, emarginate at sides, . . . 62 
Females, bands conspicuous, . . .63 
62. Front comparative shining, flagellum blackish, (Mesilla 
Valley.) . . . albipennis, race tielianthi, Ckll 
Front dull, flagellum orange, . . verbesiuiZ, Ckll. 
63. Abdomen with, white black bands , clypeus' white, Iwith 
two black dots, .... perpulchra^ Ckll. 
Abdomen dark, with yellow bands, . albipennis^ Cress. 
64. Clypeus hairy, face-marks and abdominal bands white or 
cream color, ..... 65 
Not so, . . . . . , .66 
65. Legs black, ..... albovittata, Ckll., 9 • 
Legs black and yellow. (Mesilla Valley, at fls. of 
Bailey a). .... callicemta, Ckll , 
66. Yellow at sides of face extending above level of insertion 
of antennee ; size very small. (Albuquerque, Mesilla 
Valley, at fls. of Gutierrezia Q-ndi Bigelovia.) . aiistini, Ckll., $ . 
Yellow or whitish at sides of face only extending to level 
of insertion of antennas; size not so small, . 67 
67. 
Abdomen dark, with light bands. 
bigelovicBy Ckll., 9 • 
Abdomen light, with dark banks. 
68 
68. 
Nervures colorless. (At fls. of Mentzelia.) 
mentzeliarumy Ckll., 9 • 
Nervures dark brown. 
69 
69. 
Mesothorax very shiny, dark blue-green,. 
nitidella, Ckll., 9 • 
Mesothorax granular, dark olive-green ; end of abdomen 
brownish-orange. 
rhodura^ Ckll., 9 • 
70. 
Dog-ear marks absent, 
. . 71 
Dog-ear marks present, or at least represented by dots, 77 
71. 
Abdomen with the last two segments bright rufous, the 
others white, with black bands. 
crotonis, Ckll., 9 • 
Not so, ... . 
72 
72. 
Bands of abdomen at least mostly entire. 
73 
Bands of abdomen all interupted. 
ajffinis, Cress, 9 > 
Abdomen dark without bands. 
76 
73. 
Stigma solid dark brown or black. (Mesi 
11a Valley, May, 
at fls. of willow.) 
nwnerata, Ckll., 9 • 
Stigma hyaline, at least centrally. 
74 
74- 
Lateral face-marks truncate above, with a 
linear extension 
beyond the truncation ; femora entirely yellow ; length 
about 7^’ mm., . . , tozunsendi, Ckll., 9* 
Lateral face-marks obliquely truncate above ; femora part- 
ly black, .... bigelovuc, Ckll., 9> ^ar. 
Lateral face-marks coming to a point above, . . 75 
75. About 6 mm. long, resembling towns endi ; ventral sur- 
face of abdomen pale yellow ; face-marks yellow. 
(Sacramento Mts., at fls. of Bigelovia.) . stotileri, Ckll., 9* 
