Other Common Names
Ash Gray / Ashy Grey Lady Beetle
Synonyms and other taxonomic changes
Olla v-nigrum (Mulsant)
Orig. Comb: Harmonia v-nigrum Mulsant
Polished dorsal surface, and lateral margin of elytron feebly explanate (flared, "helmet-shaped").
Gray with black spots, or black with two red spots. Gordon's figures(3)
two basic color variants that are strikingly different:
there's a third alt. uncommon form:
BG data: so. 2/3rds of US (CA-FL-VA-OR), similar dist. per Discovery Life
, though mostly sw US per iNat(4)
historically (Gordon, 1985) ranged further north, across most of the US, except Maine and Pacific NW / s. to Argentina - Map (3)
may be present in agro-ecosystems (5)
mostly: Mar-Sept (full season: Feb-Dec) (BG data)
Type Locality: Oaxaca, Mexico
Dark form can be confused with Chilocorus sp, which have elytra more explanate (appearing more flared) and are a different shape (more "A-frame" basally). Chilocorus sp. never have white markings on head or pronotum.
Both pale and dark forms might be confused with similar forms of Harmonia axyridis:
Specific coloration, markings, and shape separate the two. Especially note that O. v-nigrum's spots tend to appear triangular, always with the side sloping away from the suture (where the wings meet) basally. H. axyridis' spots tend to be more of a rounded square.
Psyllobora plagiata has similar color and markings, but size is much smaller, only 2.5 - 3.1 mm (1/8 inch or less).
Mulsant, M.E. 1866. Monographie des coccinellides. Mem. Acad. Sci. Lyon 15: 1-112. (p.64