8 A REVISION OF THE ASTACID.E. 



Vol. I. pp. 402—405. This paper is the same in substance as the last ; but C. pladdus 

 Hag. is omitted from tlie list, and C Coucsi Streets ? is added. 



1883. The e.xhibition of living specimens of Camharus Bartonii from North Grafton, 

 Worcester Co., j\Iass., at the rooms of the Worcester Niitural History Society, is recorded 

 in " Scientific and Literary Gossip," Vol. I. p. 113. The only locality in this State 

 hitherto known was Willianistown, in Berkshire Co. Throiigh the kindness of Mr. F. G. 

 Sanborn these specimens are now in the collection of tlie Museum of Comparative 

 Zoology. 



1884. In a note " On the so-called Dimorphism in tlie Genus Cambarus," in Amer. 

 Journ. Sci., Vol. XXVII. pp. 42-44 (reprinted in Ann. and Mag. of Nat. Hist., 5th Ser. 

 Vol. XIII. pp. 147, 148j, I suggested that the two forms of the male Cambarus were 

 alternating conditions of the same individual connected with the reproductive seasons, 

 and not dimorphic forms, as was commoidy supposed. (See p. 12.) 



1884. Mr. Kalph S. Tarr descril)es in Nature, Vol. XXX. pp. 127, 128, the burrows of 

 C. Diofjoics Girard. 



1884. Dr. C C. Abbott, in the American Naturalist, Vol. XVIII. pp. 1157, 1158, 

 takes exception to Mr. Tarr's conclusion that the mud chimneys built by C. Diogenes are 

 the accidental residt of the excavation of the burrows. 



1884. Descriptions of the new species of Cambarus found during the preparation of 

 this Revision, together with a synonymical list of the species of Cambarus and Astacus, 

 were puljlished by me in the Proceedings of the American Academy of Arts and Sciences, 

 Vol. XX. pp. 107-158, December, 1884. 



Dr. Hagen's Monograph must ever remain the foundation for all 83-8- 

 tematic work on the North American Astacicla3. The types of all his species 

 are in the Museum of Comparative Zoiilogy, and have been constantly 

 before me in the preparation of the present Revision. With far ampler 

 material at my disposal than fell to Dr. Hagen's lot, I have seldom had 

 occasion to differ from liim in his conclusions concerning the species known 

 to him. Thirty-two species of Cambarus are described by Dr. Hagen. Of 

 these, eleven are described as new species ; viz. C. fullax, Leconiei, versutus, 

 lancifer, virilis, placidm, juvenilis, obscuriis, imnmnis, cxtrancus, and ohesus. Of 

 these, C. placidus and C. juvenilis are in my opinion only forms of the vari- 

 able species C. nislicus Gir. ; C. obscunis, a local variety of C. jirop/nrjims Gir. 

 C ohesus is the same as C Dloymes Gir. The remaining species included in 

 Hagen's memoir are C acidus Gir., ClarJcii Gir., irogludi/tes (LeC), Blandingii 

 (Harlan), spicidifcr (LeC), angtistatus (LeC), maniculafus (LeC), penicillatus 

 (LeC), Wiegmanni Erichs., pcllucidus (Tellk.), uffinis (Say), prophupms Gir., 

 rusticus Gir., Bartonii (Fab.), rohustus Gir., Nehrascensis Gii\, latimanus (LeC), 

 Mexicaims Erichs., Cubcnsis Erichs., advcna (LeC), and Carolimis Erichs. 

 C. maniculatus, Nehrascensis, 3Iexicanus, and Cubcnsis were known to Hagen 

 only through the descriptions of the original authors of the species. C. acu- 



