Mostly blackish, with a single lateral yellow thoracic stripe, small spots on abdominal segments 1-4 and a large dorsal spot on S7. For comparison, see "Southern" Swift River Cruiser which is the southern race. The reduced abdominal spots are representative of the northern race. On the coastal plain, the Allegheny River Cruiser has a similar pattern to this form, but its range does not overlap in New Jersey. Caution: intergrades do occur from Hunterdon & Mercer through Monmouth. Not all can be identified as to type. More study is needed of this genus.