| Summary: | During a survey of the marine Crustacea in the vicinity of Pine Gay, Turks and Caicos Islands, an undescribed mysid, Heteromysis spottei, new species, was collected at depths ranging from 1 to 18 m. The new species belongs to the subgenus Heteromysis Bacescu and can be distinguished from the five other members of that subgenus known from the western Atlantic by the setation of the telson. In Heteromysis spottei the telson has spine-setae along the entire length of the lateral margins, spinules along the entire margins of the cleft, and a pair of spine-setae on each apical lobe, the outer being nearly three times longer than the inner. A key and diagnostic table to the species of the subgenus Heteromysis from the Northwest Atlantic is presented.
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