Elaphrus (Elaphrus) ruscarius Say 1830
Biology:
Found with E. californicus on the silt on both sides of the Channel; with the same habits. They are active in the daytime, fully winged, and probably fly quite well, although they mostly fun to escape capture. Many examples collected on the Island and adjacent Maryland shore between 1905 and the present (DHC, WSF, GFH, TLE, DRW). No teneral specimens seen. Adults were collected in March, April, and July. According to Lindroth (1961b) adults probably hibernate. Total length, 6.7 to 7.2 mm (7.0).
Synonyms: Elaphrus ruscarius, Say, 1830; Elaphrus texanus, Casey, 1924