Gerapus, Unciola^ and Lepiclactylls. 283 



:iii(l not at, tlie time liaxing access t() llic tig-iircs of Slabi)er's Oniscns 

 are/Kirias, upon which Latreiile's genus Pterijyuceni was based, I, 

 in 1871, recorded, in the Report on the Invertebrate Animals of 

 Vineyard Sound, Say's si)ecies under his generic and specific names 

 and made no attempt to straighten the generic or specific synonymy. 

 A richly illustrated memoir, by Carl Bovallius, on the European 

 Sulcator [Pteryc/oceru), and British specimens received from the 

 Rev. A. M. Norman, have recently artbrded an opportunity for 

 comparing the American and European forms. On comparing 

 New England specimens of Say's species with Bovallius' numerous 

 and excellent figures, and with the Britisli specimens, I can find 

 no characters by which the American can be distinguished from the 

 European form. Say's generic name should therefore be retained 

 in place of Latreiile's Pterygocera, though Slabber's specific name 

 (fortunately a more appropriate designation) takes precedence of 

 Say's dytlscus. The following synonymy of the genus and species 

 sufficiently explains these changes in nomenclature. Except under 

 Lepldactylis, I give only the earliest reference under each name, as 

 this part of the synonymy is pi-etty fully given by Bovallius. 



Pterygoceriis^^ Bovallius. 

 Lepldactylis Say. 



0«isc7/s Slabber, Natuurkundige Verlustigingen, p. 92, pi. II, tigs. ?>, 4, 1778. 

 Lepidadylis Say, Jour. Acad. Nat. Sci. Philadelphia, i, p. 379, 1818 (dytiscus the 

 only species). 

 Desmarest, Dictionnaire Sci. uat , xxviii, p. 358, 1823 ( = Say); Consid. gener. 



Crust., p. 272, 1825 ( = Say). 

 M.- Edwards, Ann. Sci. nat., Paris, xx, p. 397, 1830 ( = Say). 

 Dana, Amer. Jour. Sci., II, viii, p. 138, 1849, and xiv. p. 313, 1852 C>BellJa Bate); 



U. S. Expl. Expd., Crust., p. 912, 1853. 

 Bate, Catalogue Amphip. Crust. British Museum, p. Ill, 1862 (=Say). 

 Pterygocera Latreille, Encyclopedie metbodique, x, pp. 121, 236, 1825 (teste Boval- 

 lius); in Cuvier, Regne animal, 2" edit., iv, p. 124, 1829. 

 Bellia Bate, Ann. Mag. Nat. Hist., II, vii, p. 318, 1851. 



Sulcator Bate, Ann. Mag. Nat. Hist., II, xiii, p. 504, 1854 (in place of Bellia pre- 

 occupied). 



According to Bovallius, Statins Miiller, in a German translation of 

 Slal)ber's woi-k al)0ve referred to, in 1781 proposed the generic name 

 llaustorias for Slabber's si)ecies ; but, as Bovallius says, the name is 

 an adjective, has never come into use, and is properly rejected. 



Trans. Conn. vVcad., Vol. IV. 37 July, 1880. 



