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Species Lilioceris lilii - Lily Leaf Beetle

Scarlet Lily Beetle larva - Lilioceris lilii Red Lily Beetle - Lilioceris lilii Lilioceris lilii Lilioceris lilii Red Lilly Beetle - Lilioceris lilii Lily Leaf Beetle - Lilioceris lilii - male - female Lily Beetle  - Lilioceris lilii - male - female larva - Lilioceris lilii
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Chrysomelidae (Leaf Beetles)
Subfamily Criocerinae
Tribe Criocerini
Genus Lilioceris
Species lilii (Lily Leaf Beetle)
Other Common Names
scarlet lily beetle
Synonyms and other taxonomic changes
Lilioceris lilii (Scopoli)
Orig. Comb: Attelabus lilii Scopoli 1763
Explanation of Names
lilii - Latin, 'of lily' (Lilium is the scientific name of the host plant)
Numbers
1 Nearctic (adventive) sp. (1)
Identification
Range
New England / MB-NB (2), (BG data); range likely to increase (1)
Eurasian chrysomelid first found in Quebec in 1943, from where it has spread to several Canadian Provinces, and Vermont and Maine. It was also reported in Boston, Massachusetts, in 1992, and it is now found in several New England States.
Native to the Palaearctic (common across n. Eurasia) (3)
Season
May-Aug (BG data)
Food
hosts: Fritillaria, Lilium (1)
Leaves of all true lilies: Asiatic, Oriental, tiger lilies and hybrids are eaten first. As the population grows, buds, flowers and stems are also eaten. Populations can build so quickly that entire plantings seem to disappear overnight.
Adults also will feed on Fritillaria, Polygonatum, Solanum, Smilax, Nicotiana and other plants but are not able to complete their life cycle on these hosts. They do not feed on daylilies.
Life Cycle
1. Eggs. 2. Larvae. 3. Larvae with coating removed. 4. Male and female adults

Larvae cover themselves with excrement, probably as a protection against predators.
Remarks
This is one of many leaf beetles that make an audible high-pitched squeaking stridulation when grabbed. The larvae under dark brown "crud" along the edges of leaves they are eating, literally a protective barrier of their own feces.
Probably spreads with the sale and movement of potted lilies, flowering bulbs or cut flowers. In countries where it is invasive, it is a serious pest of cultivated lilies and fritillaries. Without control methods, leaves and flowers are totally defoliated by larvae. In North America, it also represents a threat to native lilies.
Works Cited
1.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
2.Catalog of Leaf Beetles of America North of Mexico
Ed Riley, Shawn Clark, and Terry Seeno. 2003. Coleopterists Society.
3.Borowiec L. (200_-2013) Chrysomelidae: The leaf beetles of Europe and the Mediterranean subregion (checklist and iconography)