A catalogue of the ants of Paraguay (Hymenoptera: Formicidae) Author Wild, Alexander L. text Zootaxa 2007 1622 1 55 journal article 10.5281/zenodo.179222 9584df9a-a4a2-49bb-a256-cb99776f4dc8 1175-5326 179222 Crematogaster quadriformis Roger 1863 a . Crematogaster quadriformis Roger 1863a: 207 . Crematogaster quadriformis var. gracilior Forel 1901 c. NEW SYNONYMY. [w syntypes examined, MHNG; São Paulo, Brazil ] Crematogaster quadriformis subsp. vezenyii Forel 1907b: 25 . NEW SYNONYMY. Crematogaster quadriformis r. gracilior Forel. Forel 1912c: 218 . Crematogaster ( Orthocrema ) quadriformis Roger. Santschi 1918: 182 . Crematogaster ( Orthocrema ) quadriformis subsp. gracilior Forel. Emery 1924a: 135 . Crematogaster ( Orthocrema ) quadriformis subsp. vezenyii Forel. Emery 1924a: 135 . Crematogaster ( Orthocrema ) quadriformis gracilior Forel. Kempf 1972: 88 . Crematogaster ( Orthocrema ) quadriformis vezeneyii Forel. Kempf 1972: 89 . Crematogaster quadriformis is the most frequently recorded ground-nesting Crematogaster in Paraguay . This species can be diagnosed by the following combination of character states: propodeum in profile only slightly or not at all depressed below level of mesonotum; propodeal spines elongate but shorter than length of petiole; antennal scapes equal or greater in length than head length, in repose well exceeding the posterior margins of the head in full-face view; head sculpture densely punctate/striate except for a smooth frontal strip;>20 subdecumbent to suberect setae on the first gastric tergite. Crematogaster quadriformis shows considerable variation even within nest series in overall size, pilosity, eye size, and extent of punctation/striation on the head. Jack Longino examined some recent Paraguayan collections and confirmed the identity of this species as C. quadriformis . I have subsequently viewed Forel’s types of C. quadriformis gracilior from São Paulo and found them to fall well within the range of variation I have observed in Paraguay , so I synonymize C. gracilior here. I was not able to view Forel’s types of C. quadriformis vezenyii , described from material collected in Asunción. Forel’s description notes small size, a more shiny head, and lack of a well-developed tooth in the propodeal suture. These character states are common in the C. quadriformis material I have examined towards the small end of the size distribution of nest series, so I find it likely that C. quadriformis vezenyii is a collection of a young nest or small workers of C. quadriformis .