THE DISTRIBUTION OF SPECIES OF THE AEDES INCREPITUS COMPLEX IN THE WESTERN UNITED-STATES

Maps of the California and Oregon distribution of members of the Aedes increpitus complex (Aedes clivis Lanzaro and Eldridge, Aedes increpit us Dyar, and Aedes washinoi Lanzaro and Eldridge) are presented that a re based on collections reported by Lanzaro and Eldridge (1992) and ne w collections from various sites, many in the Central Valley of Califo rnia. Analysis of individually reared specimens by polyacrylamide gel electrophoresis and conventional morphological methods confirmed the d iagnostic value of isozymes for these species and of larval head hairs for distinguishing Ae. clivis from other members of the complex. Othe r larval characters and pupal hairs did not appear to have diagnostic value. An additional site was discovered where apparent hybrids betwee n Ae. washinoi and Ae. increpitus occur, and a single possible hybrid between Ae. washinoi and Ae. clivis was found at a site where these sp ecies had previously been reported to occur sympatrically.