PROC. BIOL. SOC. WASH. 92(3), 1979, pp. 634-639 THREE NEW STOMATOPOD CRUSTACEANS FROM THE PACIFIC COAST OF COSTA RICA Raymond B. Manning and Marjorie L. Reaka Abstract. — Gonodactylus albicinctus , G. costaricensis, and Nannosquilla canica are described from specimens collected off the Pacific coast of Costa Rica. Among the stomatopod Crustacea collected by one of us (M. L. R.) while participating in the R/V Searcher Expedition to Costa Rica in 1972 are three species, two in Gonodactylus and one in Nannosquilla, which appear to be undescribed. These three species are characterized below, so that names can be used in a review of the distributional ecology of Costa Rican sto-matopods which is in preparation. All of these specimens have been deposited in the Division of Crustacea, National Museum of Natural History, Smithsonian Institution. For each species specimens other than the holotype are paratypes. Measurements are in millimeters; total length is abbreviated to TL. Original references for other species discussed below can be found in Schmitt (1940) and Manning (1972). We thank Lilly King Manning for providing the illustrations, Gonodactylus albicinctus , new species Fig. 1 Material— COSTA RICA: Bahia Herradura; 09°38'45"N, 84°40'55"W; 17 m; side of outer reef; mud, shell, rocks, little if any coral, sand pockets; 10 March 1972; R/V Searcher Sta. 450; M. Reaka, leg.: H, TL 25 mm (ho-lotype, USNM 172234), 19, TL 19 mm. Isla del Cano; 08°43'15"N, 83°53'07"W; 9 m; sand, coral, rubble; 14 March 1972; R/V Searcher Sta. 471; M. Reaka, leg.: 1$, TL 13 mm. Diagnosis. — Rostral plate (Fig. \b) with anterolateral angles acute but not spiniform. Ocular scales (Fig. 1^) projecting laterally, rounded. Pleura of anterior 5 abdominal somites unarmed posterolaterally. Sixth abdominal somite with 6 carinae, swollen in male at TL 25 mm, each terminating posteriorly in sharp spine. Abdominal width-carapace length indices 788-806. Telson (Fig. \a) of oerstedii-type, length and width subequal, dorsal carinae ornamented with tubercles. Median carina strongly arched dorsally, slender in female, broadly oval in male, with posterior median spine. Ac-cessory median carinae long, almost as long as median, fused posteriorly, terminating in 3-spined corona under apex of median carina; fused part of
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