Hadrotes crassus is the next largest rove beetle present on local beaches, ranging around 16mm to 18mm. H. crassus is black with reddish hairs on the extremities and abdomen. Similar to T. pictus, these beetles are wingless and aggressive predators, using ambush and active predation to prey on smaller arthropods. Large amounts of phoretic, free-living mites can also be found underneath their elytra. H. crassus can be found more commonly than T. pictus in summer months but is also seen infrequently during all but winter months.