Bulletin of Laboratories of Denisoii University [Voi. xi. 
34. Legs entirely orange-rufous, abdomen black. (Santa Fe, 
June.) ..... foxi^ Ckll. 
Legs not orange-rufous, abdomen banded, . 35 
35. The yellow entending above antennae in median line, 36 
The yellow not extending above antennae in median line, 41 
36. The yellow extending above across the face, . 37 
The yellow extending above only at sides and middle line, 39 
37. Larger, about 5 mm. long, face-marking resembling 
errezice. (Albuquerque, Mesilla Valley, at fls. of Bigel- 
oviai) ...... bigelovice^ Ckll. 
Smaller, about 4 mm. long, . . . .38 
38. Face yellow up to anterior ocellus. (Mesilla Valley, April.) 
. . . tnartini^ Ckll. 
Face not yellow up to anterior ocellus. (Albuquerque, at 
fls. of Gutierrezia .) . . . gutierrezice^ Ckll. 
39. Upward extension of yellow in median line linear ; ner- 
vures colorless. (Organ Mts., at fls. of Mentzelia.) 
. . . mentzeliarum^ Ckll. 
Upward extension of yellow in median line shaped like a 
spear-head ; nervures brown. (Mesilla Vallew, at fls. 
of willow.) ..... saticist Ckll. 
Upward extension of yellow in median line broader, 40 
40. Incusion of blue downward terminating at a right angle ; 
pleura dark. (Mesilla Valley, at fls. of Bigelovia.) nitidella, Ckll. 
Incursion of blue terminating at an acute angle ; pleura 
largely yellow. (Mesilla Valley, at fls. of mesquite.) 
. . . . exclamans, Ckll. 
41. Cheeks armed, abdomen heavily banded, . mentzelicp, Ckll. 
Cheeks unarmed, . . -. . .42 
42. Abdomen not heavily marked, . . pallidior^ Ckll. 
Abdomen heavily marked with broad black bands. (Em- 
budo, White Sands, at fls. of Bigelovia.) townsendi, Ckll. 
43. The pale color confined to clypeus and sides of face, 44 
The pale color not confined to clypeus and sides of face, 70 
44. Abdomen dark, not banded, or the bands discontinuous, 45 
Abdomen with continuous bands, . . 60 
45. Larger species, length over 6 mm. . . .46 
Smaller species, 6 mm. or less, ... 5*^ 
46. Mesothorax practically nude, . . . *47 
Mesothorax hairy, .... 48 
47. Abdomen dark brown without pale marks, nuda, CkW 9 * 
Abdomen with creamy-white marks. (Mesilla Valley, at 
fls. of Senecio.) . . . senecionis, Ckll., 9 * 
48. Female: abdomen more or less spotted. (Mesilla Valley, 
at fls. of Verbesina.) . . . verbesince, Ckll. 
Males, . . . . . .49 
