It is found in woodlands and grasslands in northern and central California. Fireflies are in the hills of San Diego County, in San Bernardino Countys Lytle Creek and in the Santa Monica Mountains, Yanega said. Firefly expert Marc Branham of the University of Florida in Gainesville said there are 18 known species of fireflies in California, compared with 56 species in Florida, and 2,200 described species worldwide. Pets and Animals | Termite Treatment: Termites are a problem that no one wants to deal with! They prefer hot, humid climates.