Lucidota atra, the black firefly. New York.
Not all fireflies luminesce. Lucidota atra is a day-flying species, common in eastern North America, with vestigial light-producing organs.
photo details: Canon MP-E 65mm 1-5x macro lens on a Canon EOS D60
ISO 100, 1/200 sec, f/13, flash diffused through tracing paper