Delias acalis

Delias acalis is a recognized jezebel treated in the pasithoe comparison group. The specialist synthesis lists regional forms across a broad Asian area. A comparison should therefore identify which population it represents instead of treating one photograph as the complete appearance of acalis everywhere. [1][3]

Use the labelled comparison plate to separate upper and lower wing surfaces and male and female specimens. Preserve the exact position of basal colour, dark borders and pale spots. A surface-specific character should be checked against the image before becoming a short identification rule.

The specialist account includes Nepal and northeastern India, southern India, mainland Southeast Asia, the Malay Peninsula, China and Hong Kong, with regional distinctions. Daniel Chang's living Hong Kong photograph is dated 29 May 2009. It is one specific occurrence within that broader synthesis. [3]

An adult museum record and a field photograph are complementary references for the name, but neither supplies all immature stages. A regional developmental account would need a clear link between a feeding larva and its determined adult. Broad distribution makes locality especially important.

A specific acalis larval host was not established from the references checked here. The correct next source would be a direct regional rearing study, with its plant determination. A host list from another jezebel cannot resolve which plants support an acalis population.

The Hong Kong photograph supplies a place and date for a living adult. It does not establish an annual flight period or a nectar preference without further observations. A useful behavioural account would collect repeat events and distinguish the actions actually seen.

The important comparative question is how much the adult varies geographically. A source series that retains locality and sex can test whether a proposed identification character applies throughout the species. An unlabelled montage of its most different adults cannot answer that question.

An ecological summary of such a broadly recorded taxon should begin with regional populations. Host use, seasonality and habitat could vary, and the checked adult references do not measure that variation. A local study remains useful without pretending to represent the whole Asian range.

A Smithsonian pinned specimen record gives the name a physical collection reference. The specialist synthesis organizes regional form names and photographs. Museum identifiers and original locality wording let later researchers revisit the same evidence rather than relying only on a reproduced artwork. [2]

The broad regional range is not a current threat assessment. A conservation account needs contemporary locality-level data and a clear taxonomic treatment. Populations in southern India, Hong Kong and mainland Southeast Asia should not be assumed to have the same trend merely because they share the binomial.

Read the Hong Kong living photograph alongside a specimen of the corresponding regional form. Keep folded and spread-wing differences explicit. If a coloured basal patch appears through a folded wing, do not describe it as belonging to the visible upper surface without checking a matched view.

Follow one identified population and state its reference. A clear rendering can show the boundary of each colour field without intensifying it or borrowing marks from a different form. The goal is a readable adult pattern with enough context for a real comparison.

Inspect the enclosure for loose parts. Link the regional form, observer date and museum reference in the catalogue. A later determination should retain the earlier name and reference so that the broad geographic coverage remains auditable. [4]

Which acalis populations have directly documented hosts and immature stages? Are proposed adult characters stable across the regional forms? Can modern field records be linked to museum vouchers? These questions would improve both a regional natural-history account and identification across the range.

The Smithsonian record is a primary specimen anchor. The specialist page supplies the regional synthesis and attributed Hong Kong photograph; the catalogue supplies rank. Each source has a different role, and none alone establishes a complete species-wide life history.