The palaemonid shrimp Dasycaris kerstitchi Wicksten, 1983, is known only from the Mexican holotype specimen. The reexamination of this specimen has shown that this shrimp cannot be placed in the Indo-West Pacific genus Dasycaris Kemp, 1922, since it lacks flagellate exopods on all maxillipeds. On account of this and other morphological features, a new genus, Chacella, is proposed for its reception. The small eastern Pacific shrimp Dasycaris kerstitchi is known only from the holotype specimen, described by Wicksten (1983) from Punta Doble, Sonora, Mexico. The description and figures of this specimen showed a number of features that did not appear compatible with the Indo-West Pacific genus Dasycaris, as described by Kemp (1922). The holotype specimen was deposited in the collections of the Allan Hancock Foundation and was kindly made available for study by Dr. Janet Haig. Examination of this specimen revealed a number of significant morphological features confirming that it should not be placed in the genus Dasycaris, but which did not conform to those of any other described genus. A new genus is now described for the shrimp and named in recognition of Dr. Fenner A. Chace, Jr.'s considerable contribution to knowledge of shrimps and other decapods. Palaemonidae Samouelle, 1819 Chacella, new genus Definition. -Small sized, ofsubcylindrical, slightly depressed body form. Carapace without rostrum, frontal region broadly expanded and transversely truncate, with 2 very large blunt median teeth anteriorly; orbit well developed with large blunt postorbital tubercles; inferior orbital angle reduced, antennal process produced, pterygostomial notch and hepatic spine absent. Thoracic sternites moderately broad, fourth without median spine, with acute anterolateral processes. Abdomen with pleura of fourth and fifth segments elongated. Telson with 2 pairs of dorsal spines and 3 pairs of posterior spines. Antennule with normal statocyst and short, acute stylocerite, lateral border of proximal segment with acute tooth proximally, flagella feebly developed. Antenna normal, scaphocerite well developed, without distolateral tooth. Eye with oblique globular cornea, stalk with conspicuous anterodorsal process. Mandible without palp, molar and incisor processes normal; maxillula with feebly bilobed palp, laciniae not broadened; maxilla with short palp, basal endite simple, sparsely setose, scaphognathite normal; first maxilliped with short palp, caridean lobe of exopod large, without flagellum, epipod bilobed; second maxilliped with endopod normal, without exopod, epipod trapezoid; third maxilliped with short endopod, ischiomerus fused to basis, without exopod, coxa with large oval lateral plate, rudimentary arthrobranch present. First pereiopods slender, chela slender with fingers feebly subspatulate. Second pereiopods unknown. Ambulatory pereiopods robust, dactyl stout and simple. Uropods normal, exopod with small distolateral mobile spine only.