Larvae occur at the high tide line, a feature which has resulted in the demise of this species from many Florida beaches where pedestrian and vehicular traffic occur. Gulf coast populations are C. dorsalis saulcyi . In northern Florida and the panhandle this species is replaced by C. gratiosa . Other species that occur with C. hirtilabris are C. abdominalis and C. scabrosa . C. scutellaris unicolor occurs in sand ridges throughout the state of Florida.
Adults are present in Spring and Fall.
This species occurs in the same habitat with C. abdominalis, C. hirtilabris, C. gratiosa , and C. scabrosa . C. nigrior is known only from scrub habitats in Eglin AFB in Florida. This species has thus far only been found in the Fall at this location. Other populations of this species are known from north-east Georgia in the vicinity of Kite. C. repanda occurs on sand bars on the larger rivers of north central and western Florida.