PROC. BIOL. SOC. WASH. 98(3), 1985, pp. 571-573 NEW RECORDS OF CARIDEAN SHRIMPS IN THE GULF OF CALIFORNIA, MEXICO Mary K. Wicksten and Michel E. Hendrickx Abstract. —New records are provided for six species of caridean shrimps in the Gulf of California. Alpheus splendidus is reported for the first time from the eastern Pacific. Veleronia laevifrons and Periclimenes soror are noted for the first time from the Gulf of California. The pandalids Pantomus affinis and Heterocarpus vicarius are reported for the first time from off* Sinaloa. Alpheus websteri has been taken off San Carlos, Sonora. Recent collecting in the Gulf of California has resulted in the capture of caridean shrimps not reported there previously, or found outside of their recorded ranges. During a research cruise of the B/O El Puma of the Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autonoma de Mexico, two series of speci-mens of Pandalidae were found off the coast of Sinaloa, on the eastern side of the Gulf of California. Alex Kerstitch, University of Arizona, collected shrimps by SCUBA diving along the coast of Sonora, to the north of Sinaloa. The specimens have been deposited at the Estacion Mazatlan and the Allan Hancock Foundation, University of Southern California. Family Palaemonidae Periclimenes soror Nobili Periclimenes soror Nobili, 1904:232.— Bruce, 1976:299-306, figs. 1-4.— Castro 1982:11. (See Bruce 1976 for an extensive synonymy.) Previous records. —Widespread in the Indo-West Pacific region: Red Sea, Indian Ocean, Australia, Malaysia, tropical Pacific east to Hawaii, Taboga Island, Panama (Bruce 1976); Gorgona Island, Colombia (Castro 1982). Material examined. —SONORA: Bahia San Carlos, 20 m, on sea star Mithrodia bradleyi Verrill, 28 Dec 1982, A. Kerstitch, 2 specimens.— Punta Doble, 20 m, under sea stars M. bradleyi, Oreaster occidentalis Verrill, Nidorellia armata (Gray) and Astrometis sertulifera Xantus; 25 Jun 1983, A. Kerstitch, 24 specimens. Remarks. —Periclimenes soror previously has been found in association with 16 species of sea stars, including O. occidentalis, M. bradleyi, and N. armata (Bruce 1976; Castro 1982). This is the first report of Astrometis sertulifera as a host of P. soror. In his field notes, Alex Kerstitch reported that "about 75% of the larger sea stars may have 2-4 shrimps apiece" at Punta Doble. Veleronia laevifrons Holthuis Veleronia laevifrons Holthuis, 1951:199-201, pi. 63, figs. f-m. Previous records.— ECUADOR: off Cabo San Francisco, 4 m.— off La Playa, Bahia Santa Elena, 4-13 m. GALAPAGOS: Gardner Bay, Isla Espanola (Hood Island), 7 m (Holthuis 1951).