Lethocerus medius
In 3 days ~10% in a week ~30%
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 |
Rare
Under 5% of wildlife watchers report a Lethocerus medius sighting in Saguaro National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 211th most-seen of the 354 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
June–July and September–October
In those months about 10% of wildlife watchers report a Lethocerus medius in Saguaro National Park on a given day, against under 5% in August and November–May, 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.
2nd of 3
Of the 3 parks where we can rate Lethocerus medius sightings, Saguaro National Park ranks 2nd at under 5%. The best odds are in Big Bend National Park (United States, about 10%).
Same order: Hemiptera
The closest relatives of the Lethocerus medius that you can see in Saguaro National Park (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are Leafhopper Assassin Bug (about 10%), Large Milkweed Bug (about 10%) and Smoketree Sharpshooter (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 Saguaro National Park (9 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.
