Moths of North Carolina
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Euclemensia Members:
43 NC Records

Euclemensia bassettella (Clemens, 1864) - Kermes Scale Moth

Taxonomy
Superfamily: Gelechioidea Family: CosmopterigidaeSubfamily: AntequerinaeTribe: [Antequerini]P3 Number: 420448.00 MONA Number: 1467.00
Comments: Euclemensia is a small genus with five described species, including three from North America. The larvae are unusual in being parasitoids of scale insects.
Identification
Field Guide Descriptions: Covell (1984); Beadle and Leckie (2012)Online Photographs: MPG, BugGuide, iNaturalist, Google, BAMONA, GBIF, BOLDTechnical Description, Adults: Hodges (1978)Technical Description, Immature Stages: Hollinger and Parks (1919)                                                                                 
Adult Markings: This is a small and very distinctive moth with boldly contrasting black and reddish patterning. The following description is based primarily on those of Forbes (1923) and Hodges (1978). The head, thorax, and ground color of the wings is bronzy-black. The antenna is blackish with a white band on the apical third. The labial palp is recurved, yellowish, and reaches the vertex. The forewing has an extensive area of bold, orangish-red scales that begin on the inner margin at the basal fifth. From there, it extends as a broad, convoluted band to the costa, then posteriorly as a longitudinal subcostal streak to the apex. The hindwing and cilia on both wings are smoky gray. The legs are mostly bronzy-black with whitish spines. Hodges (1978) noted that individuals vary substantially in size, which is positively correlated with the size of the host that is used.
Wingspan: 15 mm (Forbes, 1923)
Forewing Length: 4.0-6.2 mm (Hodges, 1978)
Adult ID Requirements: Identifiable from good quality photos of unworn specimens.
Immatures and Development: The larvae are unusual in being parasitoids of hemipteran scale insects. They exploit species of Kermes and Allokermes, including A. kingii (Hollinger and Parks 1919; Lee and Brown, 2011), which are members of the family Kermesidae. The scale insects typically feed on oaks, and the females produce small gall-like covering beneath which they lay their eggs. The larvae of E. bassettella are internal parasitoids that feed within the scale galls on the female's body tissues. They form a U-shaped chamber in the body of the host, which finally becomes very hard and gall-like (Hollinger and Parks 1919). The caterpillar is white, with a brown head and strongly concave dorsally. The setae are minute and the prolegs are rudimentary. Pupation occurs in the chamber without the construction of a cocoon, and the moth emerges through a circular slit that is cut by the last instar larva (Hollinger and Parks 1919; Forbes, 1923).
Distribution in North Carolina
Distribution: Euclemensia bassettella is found in eastern North America from the New England states and adjoining areas of Canada, southward to southern Florida, and westward to central Texas, Oklahoma, Kansas, and eastern Nebraska. It appears to be less prevalent in the Appalachians Mountains than elsewhere. As of 2021, our records are all from the Coastal Plain and eastern Piedmont.
County Map: Clicking on a county returns the records for the species in that county.
Flight Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

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