Chromosome numbers in Spanish formicidae (Hymenoptera). IV. New data of species from the genera camponotus, formica, lasius, messor, and monomorium

In this paper we report new karyological data from seven species belonging to subfamilies Formicinae and Myrmicinae. Among them we include two that are considered as endemic Iberian species, Formica frontalis and Formica subrufa. Also the chromosome number of Formica gerardi is reported. In Lasius brunneus, a variation on chromosome number probably due to the presence of B-chromosomes was detected. For two other species (Camponotus cruentatus and Messor barbarus) we found different chromosome numbers from those previously published. Also we confirm the chromosome number reported for Monomorium subopacum.