Lethocerus medius
In 3 days ~20% in a week ~40%
Lethocerus medius is a species of giant water bug in the family Belostomatidae. It is found in Central America from northern Panama north throughout Mexico to southern Arizona, New Mexico, and Texas in the United States, and Cuba, Jamaica, the Cayman Islands, and the Bahamas.
They grow up to 49–58 mm for males and 62–63 mm of females. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States | |
| 2 | Saguaro National Park | 🇺🇸 United States | |
| 3 | Cumbres de Monterrey National Park | 🇲🇽 Mexico |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Monterrey | 🇲🇽 México | |
| 2 | San Antonio | 🇺🇸 United States | |
| 3 | Austin | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Lethocerus medius sighting in Big Bend National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 141st most-seen of the 329 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
March–May, September and November
In those months about 10% of wildlife watchers report a Lethocerus medius in Big Bend National Park on a given day, against under 5% in June–August, October and December–February, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Lethocerus medius sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
Yes
Of the 3 parks where we can rate Lethocerus medius sightings, Big Bend National Park has the highest daily chance: about 10%. Next come Saguaro National Park (United States, under 5%) and Cumbres de Monterrey National Park (Mexico, under 5%).
Same order: Hemiptera
The closest relatives of the Lethocerus medius that you can see in Big Bend National Park (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are Giant Agave Bug (about 30%), Western Leaf-Footed Bug (about 20%) and Common Cactus Dodger (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Lethocerus medius is recorded against all the insects logged in Big Bend National Park (15 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
