Guide to Palearctic Flea Beetle Genera
(Coleoptera: Chrysomelidae: Alticinae)

Nonarthra Baly

Nonarthra cyanea Click here to see a larger image

Nonarthra Baly, 1862:455 (type species N.variabilis Baly, 1862, Oriental, by original designation). - Heikertinger, 1924a:27. - Heikertinger & Csiki in Junk, 1940:573. - Maulik, 1926:114. - Chen, 1933:212; 1936b:665. - Gressitt & Kimoto, 1963:743, 748. - Kimoto, 1965:404. - Scherer, 1969:239. - Medvedev, 1992:597; 1993:41, 43. - Konstantinov & Vandenberg, 1996:375. Enneamera Harold, 1875:185 (nomen novum for Nonarthra Baly).

Distribution: This genus has the majority of species in the Oriental region (southern China, southern Japan, India, Korea, Ceylon, Borneo, Philippine Islands, Sumatra). Palearctic (Russian Far East, northern China and Japan). Nonarthra variabilis was recently found in Panama as a new immigrant (Balsbaugh 1981).

Statistics: 1 species in Palearctic, about 40 species worldwide.

Host Plants: Beta vulgaris, Rosa wichuraiana (Gressitt & Kimoto 1963).

Comments: Harold (1875) proposed a new name for Nonarthra because the latter is a hybrid etymologically. Maulik (1926) pointed out that Harold had no right to change the original name except for reasons falling under the law of priority.

Diagnosis: Body medium sized, broadly oval, more or less flat from lateral view. Color yellow, brown, reddish brown, black, or metallic blue or green; sometimes elytron with spots and stripes.
Head hypo-prognathous, broadly oval, flat from lateral view. Frontal ridge, very short, wide and flat, forming swollen, angular T-shaped ridge with apical margin of head capsule. Antennal calli raised, flat, narrowly connected, well separated from each other and frontal ridge, not delimited from vertex by furrow. Orbital line absent. Interantennal space much broader than diameter of antennal socket. Eye medium sized. Antenna 9-segmented, serrated.
Pronotum short and wide. Procoxal cavity closed behind. Intercoxal prosternal process very narrow, broadly explanate apically. Mesosternum wider than prosternum but still narrow.
Elytra broadly oval, irregularly punctate, maximum width near middle. Humeral callus well developed. Epipleuron oblique, wide at basal part and notably tapering apically.
Metafemur greatly swollen. Metatibia long, curved medially, dorsally flat, with two marginal ridges; outer ridge with row of dense comparatively long denticles; inner ridge with row of obtuse, short, sparse denticles. Tarsus inserted subapically. First metatarsal segment longer than following two combined, but shorter than following three segments combined.

Generic Key	Generic Index	Morphology	Host Plants	Overview of Palearctic Fauna	Literature Cited

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