Observations on the Astacidae in the United States National Museum andin the Museum of Comparative Zoology, with descriptions of new species

OBSERVATIONS ON THE ASTACID.E IX THE UNITED STATES NATIONAL MUSEUM AND IN THE MUSEUM OF COMPARATIVE ZOOLOGY, WITH DESCRIPTIONS OF NEW SPECIES. By Walter Faxon, Assistant in charge of Mollusea and Crustacea, Museum of Comparativi Zoology, ( 'ambridgt , Massachusetts. Since the publication of my "Notes on North American Crayfishes" in L890, a good deal of material has accumulated in the United States National Museum and in the Museum of Comparative Zoology. The first part of tin-present article embodies the results of an examination of this material. 1 The .second pari relates t<> the crayfishes of the Southern Hemi-i j sphere — the Parastacince. After the publication of Part I of my '•Revision of the Astaeid.e." which treated of the Northern Hemi-sphere genera, Gambarus and Astacus, I hoped to get together a col-lection of the Parastacine crayfishes that would enable me to issue the second part of the revision in a shape similar to the first part. Disap ; pointed in this hope, I have decided to include in this paper such results as 1 could obtain from a study of the Parastacince in the two museums above named. Thanks to Mr. Charles C. Chilton, of Christchurch, New Zealand, my series of New Zealand crayfishes is ample, but lack of adequate material from Australia, Tasmania, and South America precludes a satisfactory revision of the Parastacince as a whole. Six new species and three new subspecies of Co inborn* are described ] and figured in this paper. Of these, live belong to the United States. four to Mexico, hive new species of Parastacus are also described and i figured — two from Uruguay, two from Chile, and one ostensibly from | Mexico. | 'Anyone who undertakes the perplexing study of the North American crayfishes j should have ;ii hand the following works: 1. Monograph of the North American Astacidte. By Hermann A. Hagen. 111. Cat. Mus. Comp. Zool., No. :; [Mem. Mus. j Comp. Zool., II, No. 1], 1871. 2. A Revision of the Astacidap. Parti. The Genera ' Cambarus and Astacus. By Walter Faxon. Mem. Mus. Comp. Zool., X, No. 1,1885. j 3. Notes on North American Crayfishes— Family Astacidaj. By Walter Faxon. ! Pro.-. (J. s. \at. Mus.. XII. pp. 619-634, 1890. I. The present article. In these works all the North American crayfishes are described ami many of them figured. PROCEEDINGS U-S. NATIONAL MUSEUM, VOL. XX-NO. 1136.