24,000th iNaturalist Observation: Atalantycha bilineata (Two-lined Leatherwing)

On 9 April 2026 I made my 24,000th iNaturalist observation (at left). The observation was of Atalantycha bilineata (Two-lined Leatherwing) spotted on a walk through Hillside Park (in Arlington, VA). I ended up observing three individuals (see all my observations of Atalantycha bilineata here).

Atalantycha bilineata was originally described by American entomologist Thomas Say in 1823 under the binomial name Cantharis bilineata in the Journal of the Academy of Natural Sciences of Philadelphia (volume 3, page 182):

6. C. bilineatus. Rufous; elytra black; thorax with two black lines. Inhabits the United States.

The eagle-eyed will note that Say indicates the species as C. bilineatus, not C. bilineata. Why you ask, well, the discrepancy arises from the gender of the species name, which must agree with the genus name Cantharis (feminine). While it was sometimes historically listed with the masculine suffix -us, the correct scientific name based on ICZN rules is Cantharis bilineata.

At right: Say, T. (1823). Cantharis bilineata. In Journal of the Academy of Natural Sciences of Philadelphia (Vol. 3, p. 182). Zenodo. https://doi.org/10.5281/zenodo.19498272

The species had kept the Cantharis bilineata name until 2005 when Sergey Kazantsev's review of the genus established the new Nearctic genus Atalantycha to accommodate certain species, including A. bilineata as a new combination.

iNaturalist Observations: In and Around Copenhagen (22-31 March 2026)

Nesting Mute Swan

I attended the 2026 GBIF Midterm meetings in Copenhagen in March 2026. I added on a few days of holiday to visit some of my favorites in the city.

The weather wasn't really good for a lot of observations and I didn't get out of the city, so many of my observations were of birds (especially around the Lakes). 

Total: 23-31 March 2026 (as of 1 April 2026)

• Observations: 89

• Species: 38

Notables

• Eurasian wigeon (Mareca penelope)

• Great Tit (Parus major)

• Deer (partial jaw)

Here are all my observations from various trips to Denmark: Denmark: My Observations

Jaw of a species of Dear

First Spotted Lanternfly (Lycorma delicatula) observation of the year

 

Last year, I made my first Lycorma delicatula observation on 13 April 2025. This year, it was 10 days earlier (3 April 2025) in nearly the same spot. With the large number of (visible) egg masses in my neighborhood, I fear it will be another booming year. 

In 2025, I made 1,519 observations in Arlington, Virginia.

iNaturalist Observations: In and Around Croatia & Slovenia (14-25 February 2026)

 Croatia & Slovenia

February wasn't the best time of year to be doing iNaturalist observing in Croatia and Slovenia, especially in mostly urban locations. Lots of birds (and lots of Feral Pigeons). Plenty of opportunities for urban botanizing and, especially in Ljubljana, water fowl.

Croatia

At right is a Hooded Crow (Corvus cornix)

The hooded crow (Corvus cornix), also colloquially called just hoodie, is a Eurasian bird species in the genus Corvus. Widely distributed, it is found across Northern, Eastern, and Southeastern Europe, as well as parts of the Middle East. It is an ashy grey bird with black head, throat, wings, tail, and thigh feathers, as well as a black bill, eyes, and feet. Like other corvids, it is an omnivorous and opportunistic forager and feeder. -- iNaturalist

My Observations

Total: 14-20 February 2026 (as of 28 February 2026)

• Observations: 28

• Species: 17

Notables

• Saw quite a few Hooded Crows (Corvus cornix)

Slovenia

At right is a European Firebug (Pyrrhocoris apterus): 

The firebug, Pyrrhocoris apterus, is a common insect of the family Pyrrhocoridae. Easily recognizable due to its striking red and black coloration, it may be confused with the similarly coloured though unrelated Corizus hyoscyami (cinnamon bug or squash bug). Pyrrhocoris apterus is distributed throughout the Palaearctic from the Atlantic coast of Europe to northwest China. Beyond its native Palaearctic range, it has been recorded in the United States, Central America, India, and Australia. It has been reported as recently expanding its distribution northwards into mainland United Kingdom and eastward on to the coast of the Mediterranean Sea.They are frequently observed to form aggregations, especially as immature forms, containing from tens to perhaps a hundred individuals. - iNaturalist

My Observations

Total: 20-25 February 2026 (as of 28 February 2026)

• Observations: 58

• Species: 31

Notables

• European Firebug (Pyrrhocoris apterus)