OTHER SUGAR-CANE INSECTS IN HAWAII. 45 
ing on the stalks are killed in the process of milling, and the remaining 
forms on the discarded stalks and leaves in the field are destroyed 
by the fire. 
NATURAL ENEMIES. 
There is present in Hawaii a ladybird beetle, Cryptolemus mon- 
trouziert Muls., which is a special mealy-bug feeder. This ladybird 
is one of Mr. Koebele’s introductions from Australia. It has proved 
particularly beneficial in feeding upon the sugar-cane mealy-bug 
in the Hawaiian cane fields, and through its work the numbers of the 
mealy-bug have been greatly reduced in recent years. This impor- 
tant predator has been established in California, and the Bureau of 
Entomology at Washington, D.C., has under way at present negotia- 
tions to import this beetle into the cane fields of southern Louisiana 
which are infested by the mealy-bug. 
The ladybird is thus described by Prof. W. W. Froggatt, govern- 
ment entomologist of New South Wales.% 
This beetle is very variable in size, measuring from under 2 to 3 lines in length, 
with the head, thorax, extreme tip of both wing covers light orange-yellow; the whole 
of the under surface reddish-brown, and both the upper and under surface clothed 
with fine hairs. In a number of specimens the under surface is variable in colora- 
tion, the middle and hind pairs of legs with the thorax dark reddish-brown to black. 
The larva is of the usual smoky-brown tint, but so thickly clothed on the upper 
surface with white filaments that it appears to be of a uniform white, the pupa hidden 
beneath the larval skin and the immature beetle are pale yellow. 
MISCELLANEOUS INSECTS AFFECTING SUGAR CANE IN HAWAII. 
An aphis, Aphis sacchari Zehntn., is occasionally injurious to sugar 
cane. Koebele records an outbreak of the species on the Island of 
Kauai in 1896 under the name Aphis sp.? The species was deter- 
mined by Kirkaldy in 1907.° This insect is known to occur on cane 
inJava. In Hawaii, the species is fed upon by the ladybird Coccinella 
repanda Thunb., though the benefit from this beetle is offset by the 
work of its braconid parasite, Centistes americana Riley. 7 
In some districts where the cane fields are situated in moist loca- 
tions, a mole cricket, Gryllotalpa africana Beauv., is sometimes 
abundant enough to be injurious. Another species of mole cricket, 
Scapteriscus didactylus Latr., is a most important pest of sugar cane 
@ Froacatt, W. W.—Australian ladybird beetles. <Agr. Gazette of New South 
Wales, vol. 13, pt. 9, pp. 907, 908, September, 1902. 
6 KoEBELE, ALBERT.—Hawaiian Planters’ Monthly, vol. 15, no. 12, pp. 596-598, 
December, 1896. 
c KrrKaupy, G. W.—On some peregrine Aphide in Oahu. <Proc. Hawaiian Ent. 
woc., vol. 1, pt. 3, pp. 99, 100, July, 1907. 
