Description: English: Edward Saunders , 1896 The Hymenoptera Aculeata of the British Islands : a descriptive account of the families, genera, and species indigenous to Great Britain and Ireland, with notes as to habits, localities, habitats London :Reeve,1896.Plate 5
Plate text 1 Tetramorium caespitum (Linnaeus, 1758) male 1a Tetramorium caespitum Linn antenna 2 Tetramorium caespitum Linn female 3 Tetramorium caespitum Linn worker 3a Tetramorium caespitum Linn worker clypeus &c 4 Leptothorax acervorum (Fabricius, 1793) male 5 Leptothorax acervorum Fab female 6 Leptothorax acervorum Fab worker 7 Leptothorax tuberum r. Nylanderi Foerst. =Temnothorax nylanderi (Foerster, 1850) worker. Date: 1892. Source:
https://www.biodiversitylibrary.org/item/41393#page/424/mode/1up. Author: Edward Saunders.