September, 1941 
thaea rosea), where it is often a pest. The 
nymphs and adults feed on the leaves, caus- 
ing white spots to appear where the chloro- 
phyll is removed; with severe infestation the 
leaves may turn yellow and dry out. In 
Colorado the author found this bug breed- 
ing on a wild species of A/thaea. In Illinois 
it was found breeding also on mallow 
(Malva rotundifolia), a very near relative 
of the hollyhock. 
Known DIstrisuTion.—Colorado, Illi- 
nois, Iowa, Michigan, Minnesota, Wyo- 
ming. 
Illinois Records.—Sixty-three males and 
68 females, taken May 31 to Sept. 30, are 
from Algonquin, Decatur, Galena, La 
Harpe, Monticello, Urbana. 
Melanotrichus catulus (Van Duzee) 
Orthotylus catulus Van Duzee (19164, p. 106). 
Mare.—Length 4.50, width 1.60. Head 
width 0.82, vertex 0.43. Antennae, first seg- 
ment, length 0.27; second, 1.00. Pronotum, 
length 0.56, width at base 1.20. General 
color whitish to testaceo-grayish; head and 
calli tinged with yellowish; hemelytra some- 
times slightly infuscated; membrane fumate. 
Clothed with simple, erect, fuscous hairs, 
intermixed with recumbent, silvery, glossy 
pubescence. Genital claspers distinctive for 
species, fig. 126. 
FEMALE.—Length 3.90, width 1.50. Color 
and pubescence similar to those of male. 
Host PLant.—Low cudweed (Gnaphali- 
um uliginosum). 
KNown DIstTRIBUTION.—Connecticut, 
Illinois, Iowa, Maine, Minnesota, New 
York, Ontario. 
Illinois Record—MarsHat_: May 25, 
Mee peel, Frison, 22¢,-4¢. 
Orthotylus Fieber 
KE Ye CO SPECIES 
1. Ground color green; dark markings, 
if present, not clouding corium.... 2 
Ground color pale testaceous to black, 
sometimes greenish, but, in that 
case, hemelytra marked with fus- 
pous and) blackvareas, figs 129%, 5. . 11 
BS emalsiength not-over 4.00. >..0.... ) 
Iearger, length 4.50 or more. .......... 7 
i) 
3. Rostrum not reaching posterior mar- 
gin of mesosternum, extending very 
10. 
KNnicHT: PLANT Bucs, or MiripAz, or ILLINOIS 97 
little beyond middle; pubescence 
fuscous..........chlorionis, p. 98 
Rostrum attaining or surpassing pos- 
terior margin of mesosternum.... . + 
Length of second antennal segment 
less than three times width of ver- 
tex between eyes. . .robiniae, p. 100 
Length of second antennal segment 
equal to or more than three times 
WiG ChEOIS VierCexen fe meen pare 5 
Length of third antennal segment 
three-fourths length of second seg- 
ment; hemelytra with soft, simple 
pubescence intermixed with a limit- 
ed number of minute, golden, silky 
hairs eae, cee ae eee ulmi, p. 100 
Length of third antennal segment 
not more than two-thirds length of 
second segment; hemelytra with 
only stiff, simple pubescence...... 6 
Length of second antennal segment 
distinctly greater than width of pro- 
notum at posterior margin; hemely- 
tra and veins in membrane deep 
DIGer erect aan ae taxodii, p. 101 
Length of second antennal segment 
not exceeding width of pronotum 
at posterior margin; hemelytra and 
veins of membrane yellowish green, 
Veins oltem pale, sea. ramus, p. 100 
. Tylus with small fuscous spot at base. 8 
Tylus without small fuscous spot at 
Desens 5 ae oy eee 3 
Membrane pale, darkest specimens 
pale fuscous; clavus never in- 
fUsCaAtCC yee eran oe viridis, p. 101 
Membrane uniformly dark fuscous 
or black; clavus sometimes with a 
GUS Vir CIOUCIE sean neen ee eet ere 
modestus var. immaculatus, p. 104 
Length of second antennal segment 
twice width of head across eyes; 
first antennal segment  fuscous; 
jengt hey 70 roe basicornis, p. 102 
Length of second antennal segment 
less than twice width of head across 
CV CS nt ie geet tee at 057 10 
Length 5.80-6.10; rostrum extending 
upon middle coxae; first antennal 
segment may be fuscous to black 
beneath, but always paler above. . . 
Pg oes Sear Mes ae Ree rossi, p. 102 
Length 6.70-7.30; rostrum just attain- 
ing posterior margin of mesoster- 
num; first antennal segment uni- 
formly black...... notabilis, p. 100 
