September, 1941 
Xenoborus pettiti (Reuter) 
Tropidosteptes pettiti Reuter (1909, p. 50). 
Apu ts.—Length 5.70, width 2.10. Gen- 
eral color black; scutellum yellow; some- 
times with embolium, basal half of corium, 
and all of cuneus except apex, pale; front 
of head and pronotal disk sometimes red- 
dish; lateral margins and basal angles of 
disk never so pale as median line, except in 
teneral specimens killed before any black 
color develops on pronotum; legs pale, with 
posterior femora almost black apically, or 
with dark color forming two subapical 
bands. Male claspers as in fig. 157. 
_Foop Prant.—White ash (Fraxinus 
americana); occurs during May and June. 
Known DistriputTion.—lowa, Kansas, 
Minnesota and eastward. 
Illinois Records.—NorrtHern ILLINOIS: 
1g. ALGONQUIN: June 12, 1897, 19 ; June 
29, 1907, W. A. Nason, 1 ¢,19. Cnicaco: 
June 5, 1908, at light, W. J. Gerhard, 1 2, 
FM. FRANKFORT: June 8, 1933, Mohr & 
Townsend, 49. Paros Park: June 20, 
1909, at light, W. J. Gerhard, 424, Fm. 
MREANA: May 19, 1889, C. A. Hart, 1 4; 
May 31, 1889, C. A. Hart, 19. Wuuite 
Pines Forest STATE Park: June 4, 1933, 
Ross & Townsend, 1 ¢. 
Lygidea Reuter 
PE elLOPSPECIES 
1. Rostrum scarcely attaining posterior 
margin of intermediate coxae...... 2 
Rostrum reaching to near apices of hind 
CONS RUN ee 4 
2. Length of first antennal segment equal 
to width of vertex plus one-half dor- 
sal width of an eye; hemelytra with 
pubescence chiefly suberect, set 
moderately close; cuneus chiefly pale, 
red only along inner margin and at 
EON AS ee ks viburni, p. 145 
Length of first antennal segment less 
than or scarcely greater than width 
ON GES oS a 3 
3 Second antennal segment provided 
with several erect hairs that in length 
exceed thickness of segment; length 
UCTS) aa rosacea, p. 145 
Second antennal segment provided only 
with short hairs that in length are 
less than thickness of segment; 
length 5.60-5.90....... salicis, p. 146 
KNIGHT: PLANT Bucs, or MiripAz, or ILLINOIS 
145 
4. Color orange red with basal margin 
of pronotum and variable areas of 
outer margins of hemelytra fuscous 
foOalmostiplacks eases mendax, p. 146 
Color chiefly fuscous to almost black 
with ground color pale to greenish, 
never reddish........obscura, p. 145 
Lygidea rosacea Reuter 
Lygidea rubecula rosacea Reuter (1909, p. 
6). 
Mare.—Length 6.70, width 2.00. Head 
width 1.26, vertex 0.63. Rostrum, length 
1.85, reaching to middle of intermediate 
coxae. Antennae, first segment, length 0.60; 
second, 2.10, pubescence dense and _ inter- 
mixed with several erect hairs which in 
length exceed thickness of segment; third, 
0.88; fourth, 0.57. Hemelytra densely 
clothed with closely appressed, golden yel- 
low pubescence; clavus and apical half of | 
corium fuscous to black, basal half of corium 
and embolium yellowish translucent. Cuneus 
red with a yellowish area at base and ex- 
tending to middle along outer margin. 
FEMALE.—Length 6.50, width 2.60. Head 
width 1.34, vertex 0.68. Antennae, first seg- 
ment, length 0.60; second, 1.90; third, 0.80; 
fourth, 0.60. Dorsum chiefly red, although 
in dark forms clavus and apical half of cor- 
ium becoming infuscated. 
Foop PLANT.—Sandbar willow (Salix 
longifolia). 
Known DistrisuTion. — Illinois, Iowa 
Minnesota, Ohio, South Dakota. 
Illinois Records.—Fifteen males and 32 
females, taken June 1 to July 7, are from 
Champaign, Chicago, Elizabethtown, Free- 
port, Grand Tower, Grayslake, Iroquois, 
Kampsville, Keithsburg, New Milford, Pike, 
Prophetstown, Savanna, Urbana, Vienna, 
Willow Springs. 
y 
Lygidea viburni Knight 
Lygidea viburni Knight (1923d, p. 569). 
No Illinois specimens; known from 
Massachusetts, New Hampshire, New 
York. Breeds on nannyberry (Viburnum 
lentago). 
Lygidea obscura Reuter 
Lygidea rubecula obscura Reuter (1909, p. 46). 
Mate.-—Length 6.00, width 2.20. Smaller 
and darker colored than rubecula (Uhler). 
