A NEW TROGLOBITIC CRAYFISH, PROCAMBARUS-(LONNBERGIUS)-MORRISI, (DECAPODA, CAMBARIDAE) FROM FLORIDA

Procambarus (Lonnbergius) morrisi, an albinistic troglobite, is described from Devil's Sink, seven kilometers west of Interlachen, Putnam County, Florida. Having its closest affinities with P. (L.) acherontis (Lonnberg), it is the second crayfish to be assigned to the subgenus. It may be distinguished from the latter species by possessing a well developed cephalic process on the first pleopods of first form males and by the looped sculpturing on the annulus ventralis in the females. This is the only albinistic crayfish in which the first pleopod of the male lacks a mesial process. Emended diagnoses of the subgenus and P. (L.) acherontis are presented.