74 
bulletin 94. 
Ventral surface of abdomen red banded with yellow; third 
antennal joint shorter than fourth.58. 
57. Third antennal joint long-; fourth considerably longer than 
fifth (Colo.).morrisoni var. flageilaris Ckll. 
Third antennal joint shorter; fourth scarcely longer than 
fifth (Colo.).'.morrisoni Cress. 
58. Scutellum prominent, entirely red; tegulae strongly punc¬ 
tured; third antennal joint much shorter than fourth 
(Colo.).*.rhodoxantha Ckll. 
Scutellum not prominent, with a yellow band at base; tegulae 
smooth and shining; third antennal joint a little shorter 
than fourth (Colo.).dilucida Cress. 
59. Markings white or cream-color. .60. 
Markings yellow.62, 
60. Ferruginous species; third antennal joint much longer than 
fourth (N. M.).gutierrezis Ckll. 
Black or red and black species .61. 
61. Scutellum black with two cream-colored spots; head and 
thorax without red; third antennal joint slightly longer 
than fourth; (N. M.).aquilarum Ckll. 
Scutellum ferruginous; thorax witli much red in both sexes, 
third antennal joint much shorter than fourth (Colo.) acoepta Cress. 
62. rfs; head and thorax black.63. 
9s; head and thorax red, usually marked with black.64. 
63. Smaller, length not over 8 mm.; scutellum black; upper half 
of clypeus black (N. M.) ...beulahensis Ckll. 
Larger, length 10 mm.; scutellum red; clypeus yellow (Colo ) 
.vicinalis Cress. 
64. Tubercles and postscutellum yellow; venter of abdomen large¬ 
ly yellow (Colo.).alpha Ckll. 
Tubercles and postscutellum red; venter of abdomen red 
without yellow.65. 
65. Front marked with black; a black stripe on mesothorax; 
apex of flagellum fuscous; second abdominal segment 
with yellow lateral spots, third and fourth with bands 
(Colo.) .libata Cress. 
Front wholly red; no black stripe on mesothorax; flagellum 
wholly red; second and third abdominal segments with 
large wedge-shaped yellow marks, fourth with a band in¬ 
terrupted on each side (Colo.).coioradensis Ckll. 
66. Head and thorax black, abdomen black and rufous.67. 
Head red marked with black; thorax black, a large mark on 
each side of mesothorax, the scutellums and most of 
pleura, red; clypeus vellow; abdomen without yellow; 
(Colo.).adductaCress. 
Head and thorax red; clypeus red.68. 
67. Clypeus reddish; legs rufous; basal nervure a short distance 
basad of transverse-medial; third antennal joint a little 
longer than fourth (N. M.).pentiigera Ckll. 
Clypeus black; legs black (N. M.).sidsfloris (Ckll.) 
68. Larger, about 7 or 8 mm. long; second abdominal segment 
with yellow spots.69. 
Smaller, about 6 mm. long. .71. 
69. Lower anterior orbits very narrowly yellow; third antennal 
joint very much shorter than fourth (N. M.)......taraxacella (Ckll.) 
Lower anterior orbits not yellow.70. 
70. Fourth and fifth abdominal segments with yellow bands, not 
nearly reaching lateral margins; third antennal joint 
nearly as long as fourth (Colo.).luteopicta Ckll. 
Fourth and fifth abdominal segments without yellow bands; 
third antennal joint much shorter than fourth (Colo.)_sayi Rob. 
71. Abdomen red without yellow spots; scape stouter andlighter; 
metathorax without a black band (Colo.).rhodosomella (Ckll.) 
