Asquith, A.; Lattin, J. D. 1990. Nabicula (Limnonabis) propinqua (Reuter) (Heteroptera: Nabidae): dimorphism, phylogenetic relationships, and biogeography. Tijdschrift voor Entomologie. 133(1): 3-16.
The taxonomy and distribution of the North American species Nabicula propinqua( Reuter ), is reviewed. The macropterous form occurs in both sexes, but is much less commonthan the brachypterous form. Macropterous forms of both sexes have wider pronota. Maleshave disproportionately longer antennae than females. Male and female genitalia of N.propinqua are described and illustrated. The genitalia of individuals from isolated west coastpopulations differ only slightly from those of eastern populations. A cladistic analysis of thesubgenus Limnonabis Kerzhner is presented and a new species-group classification sug-gested. A biogeographic hypothesis explaining the present distribution of Limnonabis ispresented. We suggest that N. propinqua is a vicariant species that was isolated from apopulation contiguous with that in western Europe with the opening of the Atlantic Ocean.Correspondence: Adam Asquith, Systematic Entomology Laboratory, Department of Ento-mology, Oregon State University, Corvallis, OR 97331, USA.
Key words. - Nabidae, sexual dimorphism, wing dimorphism, biogeography, phylogeny.