B 7c/ og 7 3 Vol. 73, pp. 147-154 30 December 1960 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON PRELIMINARY DESCRIPTIONS OF ONE NEW GENUS, TWELVE NEW SPECIES AND THREE NEW SUBSPECIES OF SCYLLARID LOBSTERS (CRUSTACEA DECAPODA MACRURA) By L. B. Holthuis Rijksmuseum van Natuurlijke Historie, Leiden A study of the Scyllarid collections of the U. S. National Museum and some other institutions resulted in the discovery of a relatively great number of undescribed or unnamed taxa. As the publication of a proposed world-wide revision of the entire family containing full descriptions of these taxa will take some time, it was thought advisable to provide here pre-liminary descriptions of these new species and subspecies and of the new genus in order to make them known without delay. Ibacus ciliatus pubescens, new subspecies This subspecies is very close to the typical Ibacus ciliatus ciliatus ( Von Siebold, 1824), but differs in that the adult specimens have the dorsal surface of the carapace and the abdomen covered with a short and dense pubescence; in the typical form this surface is quite naked in the adults. Furthermore the number of posterolateral teeth of the carapace (i.e., the teeth of the lateral margin behind the cervical incision) varies between 11 and 13 in the new subspecies, being usually 12. In the typical sub-species this number varies between 10 and 12, being usually 11. Distribution: The typical subspecies is known from Japan, China, For-mosa, and the Philippines, the new subspecies has so far only been found in the Philippines (depth 52 to 391 m). Holotype: A male specimen from "Albatross" Station D 5394, near Talajit Island, Philippines, 12° 00' 30" N, 124° 05' 36" E, 13 March 1909 (U.S.N. M. Cat. No. Crust. 104285). Parribaeui ealedonicni, new species The rostrum bears a blunt dorsal tooth. The posterior of the two an-terolateral teeth of the Carapace is smaller than the anterior. The ante-rior part of the second to fifth abdominal somites (namely tlie part which 23— PhoC. Biol. Soc. Wash., Vol. 73, I960 (147) ■
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