Tuer Insect FaunA OF THE GENUS CRATAEGUS 1055 
the blossom clusters have just begun to separate and before the blossoms 
show pink. They puncture the leaves and the tender twigs but do not 
cause any noticeable injury. After the fruit sets they feed on the fruit 
also and cause very slight dimples where they puncture it. They become 
adult in late May and early June, and begin ovipositing in the twigs 
about June 15. The egg is deposited in a small slit made with the beak at 
the base of a young twig. Adults were found on the trees until late July. 
mendax Reuter, Lygidea (Bright apple redbug) 
A few nymphs of Lygidea mendax were found feeding on the leaves and 
fruit of Crataegus in late April and in May. They are not so common 
as Heterocordylus malinus. In the warm laboratory the eggs hatched on 
March 27 on Crataegus punctata twigs, but no nymphs were found in the 
field until the blossoms were opening on April 25. Adults were found 
from June 2 to August 14. One adult in a breeding cage oviposited. on. 
June 19 in a twig of Crataegus crus-galli. She chose a year-old twig, 
drilled a hole through the bark at the base of the twig, and then, turning 
about, thrust an egg into the cavity. 
ornatus VanD., Orthotylus 
A few adults of Orthotylus ornatus were found feeding on the leaves of 
Crataegus pruinosa in June. They are brownish, spotted, slender, and 
5.5 millimeters long. 
ostryae Knignt, Lygus 
A few ‘adults of Lygus ostryae were taken puncturing the leaves of 
Crataegus punctata in late June. They are pale yellowish brown, and are 
otherwise similar in appearance to the tarnished plant bug. 
pellucida Uhl., Diaphnidia 
The pale green nymphs of Diaphnidia pellucida are rather numerous on 
the foliage of Crataegus punctata during late May and early June. They 
run rapidly over the branches when disturbed, and feed on the leaves 
and tender twigs. Adults appeared from June 10 to June 15 in rearing 
cages in the laboratory, and others were found in the field on June 18. 
They are delicate, slender, pale green, and about 4 millimeters long. 
pratensis Linn., Lygus 
Adults of Lygus pratensis which have lived through the winter are some- 
times found puncturing the buds of Crataegus in April, as soon as the buds 
show green, and a few were found puncturing the young fruit in late May. 
univittatus Knight, Lygus 
Adults of Lygus univittatus are rather common during late May and 
June, puncturing the leaves and fruit of native hawthorns. They resemble 
L. communis very closely, but are generally paler. 
