A few articles.

Akbar, S. A.; Bharti, H.; Kanturski, M.; Wachkoo, A. A. 2021. First record of the myrmicine ant genus Syllophopsis Santschi, 1915 (Hymenoptera: Formicidae) from India with description of a new species. Zootaxa 4985:403-413.

Look at etymology....

http://antcat.org/documents/81…xa_syllophopsis_india.pdf

Description of two new species of ants of the genus Myrmecina Curtis, 1829 (Hymenoptera: Formicidae: Myrmicinae) from the Eastern Himalayas.
PUNNATH ASWAJ, KARUNAKARAN ANOOP, DHARMA RAJAN PRIYADARSANAN.

http://antcat.org/documents/8120/aswaj_2021_myrmecina.pdf

Wachkoo, A. A.; Bharti, H.; Akbar, S. A. 2021. Taxonomic review of the ant genus Lepisiota Santschi, 1926 (Hymenoptera: Formicidae: Formicinae) from India. Boon Zoological Bulletin 70:227-245.

http://antcat.org/documents/81…us_lepisiota_of_india.pdf

Casacci, L.P.; Barbero, F.; Ślipiński, P.; Witek, M. The Inquiline Ant Myrmica karavajevi Uses Both Chemical and Vibroacoustic Deception Mechanisms to Integrate into Its Host Colonies. Biology 2021, 10, 654.

https://www.mdpi.com/2079-7737/10/7/654/htm or https://www.mdpi.com/2079-7737/10/7/654/pdf and https://www.mdpi.com/2079-7737/10/7/654/s1 (Thanks to Merkur!)

And an article from last year, online since a few days ago:

Williams, J. L.; Zhang, Y. M.; Lloyd, M. W.; LaPolla, J. S.; Schultz, T. R.; Lucky, A. 2020. Global domination by crazy ants: phylogenomics reveals biogeographical history and invasive species relationships in the genus Nylanderia (Hymenoptera: Formicidae). Systematic Entomology 45:730-744.

http://antcat.org/documents/81…onships_in_nylanderia.pdf

A new Colobopsis species in Europe:

Schifani, E.; Giannetti, D.; Csősz, S.; Castellucci, F.; Luchetti, A.; Castracani, C.; Spotti, F. A.; Mori, A.; Grasso, D. A. 2021. Is mimicry a diversification-driver in ants? Biogeography, ecology, ethology, genetics and morphology define a second West-Palaearctcic Colobopsis speceis (Hymenoptera: Formicidae). Zoological Journal of the Linnean Society XX:1-27.

http://antcat.org/documents/81…olobopsis_new_species.pdf

And a little sidestep, not about ants but about orchids:

'Sleutel voor uitgebloeide orchideeën van Nederland en België' by Jean and Marijke Claessens.

https://europeanorchids.com/wp…loeide-orchideeen-bev.pdf

González, J. A. 2021. Description of Temnothorax estel sp. nov. (Hymenoptera: Formicidae), with a review of the Iberian species of the sordidulus species-complex. Zootaxa 5005 (2):145–160.

http://antcat.org/documents/81…alez_2021_temnothorax.pdf

First Record of the Inquiline Ant Leptothorax kutteri Buschinger, 1965 from Turkey.
Kadri Kiran, Celal Karaman, Jürgen Heinze.

http://periodicos.uefs.br/inde…gy/article/view/7224/6007

Fernández, F.; Guerrero, R. J.; Sánchez-Restrepo, A. F. 2021. Systematics and diversity of Neotropical ants. Revista Colombiana de Entomología 47:e11082.

http://antcat.org/documents/81…sity_neotropical_ants.pdf

Yamane, S.; Hosoishi, S.; Syaukani, S. 2021. Taxonomic notes on rattan-inhabting ants of the genus Camponotus (Hymenoptera: Formicidae). Zoosystematica Rossica 30:175-182.

http://antcat.org/documents/81…ting_species_taxonomy.pdf

Aswaj, P.; Sahanashree, R.; Udayakantha, W. S.; Aniruddha, M.; Priyadarsanan, D. R. 2021. Two new species of doryline ants (Hymenoptera, Formicidae) with 11-segmented antennae from India. ZooKeys 1056:59-72.

http://antcat.org/documents/81…cia_india_new_species.pdf (With determination keys....)

The evidence of temporary social parasitism by Polyrhachis lamellidens (Hymenoptera, Formicidae) in a Camponotus obscuripes colony (Hymenoptera, Formicidae).

H. Iwai, Y. Kurihara, N. Kono, M. Tomita & K. Arakawa.

https://link.springer.com/article/10.1007/s00040-021-00830-8 or https://link.springer.com/cont…07/s00040-021-00830-8.pdf

Maybe you recognize this:

Heterick, B. E. 2009. A guide to the ants of south-western Australia. Records of the Western Australian Museum Supplement 76:1-206.

http://antcat.org/documents/44…h-Western%20Australia.pdf

Now you can follow up with this:

Heterick, B. E. 2021. A guide to the ants of Western Australia. Part I: Systematics. Records of the Western Australian Museum Supplement 86:245 pp.

http://antcat.org/documents/81…the_ants_of_western_a.pdf

Just read it...:

Barrera, C. A.; Sosa-Calvo, J.; Schultz, T. R.; Rabeling, C.; Bacci, M., Jr. 2021. Phylogenomic reconstruction reveals new insights into the evolution and biogeography of Atta leaf-cutting ants (Hymenoptera: Formicidae). Systematic Entomology [online early]:1-23.

https://onlinelibrary.wiley.com/doi/10.1111/syen.12513 or https://onlinelibrary.wiley.com/doi/epdf/10.1111/syen.12513 and 4 supplements.

Lewis, J.; Sands, D. 2021. Anonychomyrma inclinata sp. nov. (Hymenoptera: Formicidae): description, biology and interaction with the endangered bulloak jewel butterfly, Hypochrysops piceatus Kerr, Macqueen & Sands, 1969 (Lepidoptera: Lycaenidae). Austral Entomology 60:461-472.

http://antcat.org/documents/8150/aen-12556.pdf

Johnson, R. A. 2021. A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II. Zootaxa 5033:1-230.

http://antcat.org/documents/81…uth_america_-_part_ii.pdf

Oliveira, A. M.; Powell, S.; Feitosa, R. M. 2021. A taxonomic study of the Brazilian turtle ants (Formicidae: Myrmicinae: Cephalotes). Revista Brasileira de Entomologia 65(3):e20210028. [online early]

http://antcat.org/documents/81…_cephalotes_of_brazil.pdf

And a very interesting article:

Boudinot, B. E.; Moosdorf, O. T. D.; Beutel, R. G.; Richter, A. 2021. Anatomy and evolution of the head of Dorylus helvolus (Formicidae: Dorylinae): Patterns of sex- and caste-limited traits in the sausagefly and the driver ant. Journal of Morphology -:1-43. [online early]

http://antcat.org/documents/81…_dorylus_head_anatomy.pdf or https://onlinelibrary.wiley.com/doi/10.1002/jmor.21410 or https://onlinelibrary.wiley.com/doi/epdf/10.1002/jmor.21410 with 5 supplements.

Borowiec, M. L.; Cover, S. P.; Rabeling, C. 2021. The evolution of social parasitism in Formica ants revealed by a global phylogeny. Proceedings of the National Academy of Sciences of the United States of America 118 (38):10 pp. e2026029118.

http://antcat.org/documents/81…ica_phylogeny_incl_si.pdf or The evolution of social parasitism in Formica ants revealed by a global phylogeny | PNAS or https://www.pnas.org/content/p…8/38/e2026029118.full.pdf with one supplement.

Ulysséa, M. A.; Brandão, C. R. F. 2021. Taxonomic revision of the Neotropical ant genus Hylomyrma Forel, 1912 (Hymenoptera: Formicidae: Myrmicinae), with the description of fourteen new species. Zootaxa 5055 (1):1-137.

http://antcat.org/documents/81…xa_hylomyrma_revision.pdf

Convergent loss of chemoreceptors across independent origins of slave-making in ants.
Evelien Jongepier, Alice Séguret, Anton Labutin, Barbara Feldmeyer, Claudia Gstöttl, Susanne Foitzik, Jürgen Heinze and Erich Bornberg-Bauer.
Molecular Biology and Evolution, 2021, pp. 1–14

https://academic.oup.com/mbe/a…93/molbev/msab305/6404594

Thanks to Merkur...

The ant genus Strumigenys Smith, 1860 (Hymenoptera: Formicidae) in western North America North of Mexico.
DOUGLAS B. BOOHER.

https://www.biotaxa.org/Zootax…cle/view/zootaxa.5061.2.1 with a pdf-link.

Griebenow, Z. 2021. Synonymisation of the male-based ant genus Phaulomyrma (Hymenoptera : Formicidae) with Leptanilla based upon Bayesian total-evidence phylogenetic inference. Invertebrate Systematics 35:603–636.

http://antcat.org/documents/81…myrma_with_leptanilla.pdf

Neue Gattung Corrieopone

Flavia A. Esteves, Brian L. Fisher: "Corrieopone nouragues gen. nov., sp. nov., a new Ponerinae from French Guiana (Hymenoptera, Formicidae)"
(https://zookeys.pensoft.net/article/75551/

Large ants are not easy – the taxonomy of Dinoponera Roger (Hymenoptera: Formicidae: Ponerinae).

Amanda Martins Dias, John Edwin Lattke.

Article and pdf-link: https://europeanjournaloftaxon…php/ejt/article/view/1603

Mixed colonies of Lasius umbratus and Lasius fuliginosus (Hymenoptera, Formicidae): when superparasitism may potentially develop into coexistence: a case study in Ukraine and Moldova.

https://zenodo.org/record/5753121#.Yb87YmhBya8

Taxonomic review of the ant genus Lordomyrma Emery, 1897 (Hymenoptera, Formicidae) from China, with description of two species and an identification key to the known species of the world.

XIA LIU, ZHENGHUI XU & FRANCISCO HITA GARCIA.

Abstract and pdf: http://www.asian-myrmecology.org/doi/10.20362/am.014007.html

Pdf: http://antcat.org/documents/81…species_and_world_key.pdf

Harshana, A.; Dey, D. 2021. First record of the ant genus Agraulomyrmex Prins, 1983 (Formicidae: Formicinae) from India, with description of a new species. Oriental Insects ?:1-9.

Species, key: http://antcat.org/documents/8187/00305316-2021.pdf

A taxonomic revision of the Palaearctic ant subgenus Coptoformica Müller, 1923 (Hymenoptera, Formicidae). With 40 figures and 7 tables and an electronic supplementary information SI1, SI2, SI3.

Bernhard Seifert and Roland Schultz.

Pdf (not the magazine, has to be published soon!): http://antcat.org/documents/81…coptoformica_revision.pdf

Phylogeny, evolution, and classification of the ant genus Lasius, the tribe Lasiini and the subfamily Formicinae (Hymenoptera: Formicidae).

Brendon E. Boudinot, Marek L. Borowiec, Matthew M. Prebus.

Pdf: http://antcat.org/documents/81…evolution_systematics.pdf

Supplement: https://doi.org/10.1111/syen.12522