Brown Longtail

Urbanus procne · Order: Lepidoptera · Family: Hesperiidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Brown Longtail
Photo: Insects Unlocked from USA, CC0

The butterfly’s wingspan measures about 37 to 48 mm. It lives from Argentina through Central America and Mexico into southern Texas, with occasional strays reaching southern New Mexico, Arizona and California. In southern Texas it can produce three generations each year.

Source: Wikipedia

Size

Wingspan is roughly 37 to 48 mm.

Source: Wikipedia

Where it lives

Rare individuals may appear in southern New Mexico, Arizona and California.

Source: Wikipedia

What it eats

Larvae feed on grasses such as Bermuda grass and Johnson grass.

Source: Wikipedia

Life cycle

Three generations occur each year in southern Texas.

Source: Wikipedia

Where it comes from

Native to areas from Argentina up through Central America and Mexico into southern Texas. Occasional strays are recorded in southern New Mexico, Arizona and California.

Source: Wikipedia

Where it is found in the US

Recorded in 2 of 51 states and DC. Most records: Texas, Arizona.

Darker = more records. Counts are museum and citizen-science records, not population size.

Source: GBIF

Months it is reported in the US

JFMAMJJASOND

Source: GBIF

Same family (Hesperiidae)

Sources

  • Wikipedia: https://en.wikipedia.org/wiki/Spicauda_procne

Look it up elsewhere: GBIF · BugGuide · Wikipedia

Text written 2026-10-23 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-23.

How this page works

This is one bug's fact sheet. The colored box at the top says whether it is dangerous. Sections below cover how to recognize it, whether it is a pest, and how to deal with it. The US map shows which states have records; tap a state to see other bugs there.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.