Harmonia arcuata (Fabricius)

Swezey, O. H., 1942, Miscellaneous Families of Guam Coleoptera, Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 150-171 : 158

1. Harmonia arcuata (Fabricius) .

Coccinclla arcuata Fabricius, Mant. Ins. 1: 55, 21, 1787. Crotch, Revision Coccinellidae, 110, 1874.

Harmonia octomaculata var. arcuata (Fabricius) Schultze, Philip. Jour. Sci. 11, D: 35, 1916.

Harmonia arcuata (Fabricius) Timberlake Ms.

Yigo , April 13, Bryan ; Inarajan , June 8, in rice field, Swezey, Usinger; Merizo , June 11, in corn field; Swezey; Barrigada , June 24, in corn field, Swezey; Dededo , Aug. 11, Swezey; Piti , Aug. 14, Oct. 1, Nov. 4, in corn field, Swezey; Merizo , Oct. 2, in rice field, Swezey; Yona , Nov. 18, on corn, Swezey.

This large, spotted ladybeetle was found already present in Guam, by Fullaway, in 1911 . There is no record of when it was introduced. It has a wide distribution: China, Philippines, Singapore, Java, Cape York, New Caledonia, Cape of Good Hope, Queensland, Fiji. It feeds on plant lice and is a very effective enemy of the corn aphis. It is often present in large numbers in corn fields infested with aphis. It is also found abundant in rice fields where it is reputed to feed on leafhoppers.