PROC. BIOL. SOC. WASH. 102(2), 1989, pp. 405-410 UPOGEBIA CORALLIFORA, A NEW SPECIES OF CORAL-BORING SHRIMP FROM THE WEST INDIES (DECAPODA: UPOGEBIIDAE) Austin B. Williams and P. J. B. Scott Abstract. — Upogebia corallifora, a new species of shrimp from the West In-dies, lives in boreholes that it excavates in CaC0 3 substrates, dead coral and Pleistocene limestone. The species, here described and illustrated, is similar in morphology to U. noronhensis from Arquipelago de Fernando de Noronha off northeastern Brazil. The chelae of the new species differ in having a longer fixed finger and lacking a row of spines on the lower mesial surface of the palm. Recent ecological studies on thalassinid shrimps, Upogebia, in the West Indies have shown that an undescribed species of this genus constructs boreholes in "skeletons of dead coral or the dead bases of living corals" (Scott, Reiswig & Marcotte 1988), and that juveniles, here provisionally included with it, bore into limestone (Scott, Moser & Risk 1988). We describe the new species in this paper. Upogebia corallifora, new species Fig. 1 Material examined.— Jamaica: USNM 230075. Holotype 9; Port Royal, Drunken-mans Cay, 3-4 m, area of dead Siderastrea siderea (Ellis & Solander 1786), P. J. B. Scott, Oct 1986. -USNM 230076. Paratypes, 2 6, 2 9(1 ovig.); Port Royal, Drunkenmans Cay, approx. 2-4 m, P. J. B. Scott, 10 Oct 1986. One 6 and one 9 from this lot of specimens are to be deposited in the National Museum of Canada. Upogebia corallifora new species ? USNM 230077. 2 9 Guv.), 2 juvs.; Discovery Bay, boring in Pleistocene CaC0 3 of an artificial reef, about 5 m depth, P. J. B. Scott, Oct 1986 (specimens softened in Aerosol OT solution after being dried). Diagnosis.— Projections to either side of rostrum ending in acute spine. Postocular spine present. First and second abdominal segment lacking ventral spines; sixth seg-ment lacking hooked anterolateral spine. Telson subrectangular. Carpus of cheliped with one small spine on mesiodistal margin. Leg 2 with proximal mesioventral spine on merus; merus of leg 4 spineless. Description. — Rostrum triangular, short, slightly downturned; tip exceeding eye-stalks; dorsal pair of strong subapical spines followed on each side by two spines suc-cessively shorter in length, and separated from first by wide interval; ornamented dor-sal two-thirds of carapace surface anterior to cervical groove bearing pilose tufts, changing from spiny anteriorly to tubercu-late posteriorly, and angling toward sides posteriorly; gastric surface posterior to this smooth; ornamented anterior part separat-ed from and flanked on each side by pos-teriorly divergent ridge bearing crest of about 12 spines, strongest on lateral rostral pro-cess and decreasing to obsolescence poste-riorly. Cervical groove deep and continu-ous, shoulder lateral to it bearing one obsolescent tubercle below intersection with thalassinidean line; latter continuing to pos-terior margin of carapace. Postocular spine present. Abdomen broadly and smoothly arched dorsally; pleura of segment 1 narrowly rounded posterolateral^, those of 2-5 broadly rounded, with dense fine plumose
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