J The Corwear Worm. 587
Second Brood of Coriscus ferns. I
V | I 1 Egg to
Egg. lst instar.l2ndinstar. 3rd instar. 4th instar. 5th instar. adult.
8/7—8/17 8/17-8/19l8/19--8/26 8/26-8/28 8/28-9/1 9/1—9/8 8/7-79/8
9 da.,17 hr 2 da.,8 hr. 6da., 16.5h 2 da., 1 hr. 3. da. 7da.,.33hr 30 da., 5hr
8/8-8/15 8/15-8/18 8/18-8/21 8,7 21-8/22*8/22-8/24 8/24-8/29 8/87--8/29
6da.,15.5hr 3 da.,15hr. 2da.,23.5h 1 da.,1.5hr 1 da.,22 hr 5 da., 1 hr. 20da.,17hr
8//7-8/17 8/17—8/20 8/20-- 8/23 8/23-8/25 8/25·8/29 8/29--9/3 8/7---9/3
9da.23.5hr3da., 1.75h 3da.,0.5hr 2da,, 25 hr. 3da. 22.5hr 4 da. 25d.23.25h.
7/31--8/12 8/12--8/15 8/15-8/18 8/18-8/218/21- 8/268/26-78/29 7/31-8/29
11da.,20hri2da. 21.5hr 3 da. . 5 hr. 2da., 22.5h 5 da.,C).5h. 3da.13.5hr 29da., 6.5h
8/19-78/26 8/26-8/29 8/29--9/1 9/1- 9/3 9/3--9/7 9/7--79/16.i8/19-7--9/16
7 da. 3 da., 6hr 1da.,17hr. 2da.23 75h 3da.22 5hr 8da.,3.5 hr 27da.,5hr.
Averages: ‘
9da.,.7hr. 3 da.,.84hr 3da.,11.9h 2da., 5.18hl3da.,13.5h 5da., 3.66h 26d ,12.48h —
Triphleps insidiosus.
This minute bug is common at times among corn silk, J
as it is about various fiowers. It appears to feed to
_ some extent on plant juices, but is fond of the juices of
i various insects, such as species of ‘“Thrips, " and is very useful
` because of its destruction of the eggs of the corn worm.
It is only about two millimeters long, and is black largely,
with some reddish brown at the bases of the front wings. It
was first observed by me July 30, 1889, at Lexington, on mil-
let, and has been frequently seen on many different plants,
millet, red clover, alfalfa, etc., its disposition like other car-
nivorous species being to wander widely. It hibernates as an
adult among rubbish at the bases of plants.
In 1912 the insect was first observed about corn during the
- first week in July. It became more and more common on corn
silk as the season advanced. Adults were kept in the In-
sectary in large numbers and aftermating they were isolated
in vials and rearing jars. One hundred and six' pairs were
kept thus during the season, but the number depositing eggs
was small. It was already known that the insect fed on the
eggs of the corn—ear worm, but it was not always possible to
secure a suflicient quantity of this food. ln confinement it
was frequently observed thrusting its beak into plant tissues.