Recibido 01-III-2001. Aceptado 06-IV-2001.

Alpheus bellimanus Lockington, 1877. Eight males and seven females (four ovigerous) were collected on shell fragments (18°02’31’’ N, 102°45’21’’ W, 30 m, Jun-23- 1993), increasing the geographic range 430 km south of Isabel Island and 220 km north of Tangola-Tangola Bay. It had been reported previously from Monterey, California, Costa Rica, Panama, Colombia, Galapagos Island, Chile, Mexican Pacific: outer coast of Baja California, Gulf of California, Clarion and Socorro Islands. Reference: Kim, W. & L.G. Abele. 1988. The snapping shrimps genus Alpheus from the eastern Pacific (Decapoda: Caridea: Alpheidae). Smiths. Contrib. Zool. 454: 1-119.

Alpheus panamensis Kingsley, 1878. One male was collected on shell bottoms (18°02’31’’ N, 102°45’21’’ W, 30 m, Jun-23- 1993), increasing the geographic range 1 200 km south of Guaymas, Gulf of California and 870 km north of Costa Rica. It had been reported previously from Panama, Ecuador, Peru. Reference: Kim, W. & L.G. Abele. 1988. The snapping shrimps genus Alpheus from the eastern Pacific (Decapoda: Caridea: Alpheidae). Smiths. Contrib. Zool. 454: 1-119.

Brachycarpus biunguiculatus (Lucas, 1849). Two males and one female were collected on shell bottoms (18°02’31’’ N, 102°45’21’’ W, 30 m, Jun-23-1993), increasing the geographic range 40 km south of Clarion Island and 870 km north of Costa Rica. It had been reported previously from Argelia, Red Sea, Gulf of Mexico, Caribbean Sea, Hawaii, Panama, Galapagos Island, Mexican Pacific: Maria Madre and Socorro Islands. Reference: Wicksten, M. 1983. Shallow water caridean shrimps of the Gulf of California, México. Allan Hancock Monogr. Mar. Biol. 13: 1-59.

Latreutes antiborealis Holthuis, 1952. One male was collected on shell bottoms (18°02’31’’ N, 102°45’21’’ W, 30 m, Jun-23- 1993), increasing the geographic range 550 km south of Mazatlan and 2 000 km north of Galapagos Island. It had been reported previously from Ancud Gulf, Chile, Peru, Galapagos Island, Mexican Pacific: Santa Maria Bay. Reference: Wicksten, M. 1983. Shallow water caridean shrimps of the Gulf of California, México. Allan Hancock Monogr. Mar. Biol. 13: 1-59.

Pomagnathus corallinus Chace, 1937. One male was collected on shell fragments (18°02’31’’ N, 102°45’21’’ W, 30 m, Jun-23-1993), increasing the geographic range 35 km south of Clarion Island and 1 100 km north of Clipperton Island. It had been reported previously from Galapagos Island, Costa Rica, Panama, Mexican Pacific: southern Gulf of California and Isabel Island. Reference: Wicksten, M. 1983. Shallow water caridean shrimps of the Gulf of California, México.

A.M. Hermoso-Salazar and P. Hernández-Alcántara