428 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



The legs of the first pair are slender; the dactylus is serrate with 

 numerous closely set short spines along the inner margin, the pro- 

 podus is narrow, oval in shape, and armed in the male with one long 

 spine. 



The color is reddish-brown mottled with white. All the free 

 margins of the body are fringed with hairs. The lateral margins of 



the segments and the caudal segment are 

 armed with spines. The uropoda and the 

 legs are spinulose. 



A large number of specimens were col- 

 lected by Mr. William Palmer and Dr. Paul 

 Bartsch at Washington Ditch, Dismal 

 Swamp, Virginia. 



Type. Cat. No. 23910, U.S.N.M. 



ASELLUS AQUATICUS (Linnaeus). 



Oniscus aquaticus LINNAEUS, Fauna Suecica, 2d 



ed., 1761, p. 500. 



Squilla asellus DE GEER, Memoires pour servir 

 a 1'histoire des Insectes, VII, 1778, p. 496. 

 Oniscus aquations O. FABRICIUS, Fauna groen- 



landica, 1780, p. 251. 



Asellus vulgaris LATREILLE, Hist. Nat. Crust, et 

 des Insectes, VI, 1803, p. 359; VII, pi. LVIII, 

 fig. 1. 

 Idotea aquatica LATREILLE, Encycl. Meth., Pt. 24, 1818, p. 6, pi. cccxxvm, figs. 



21-22. 

 Asellus vulgarw DESMAREST, Consid. Generates sur la classe des Crustacea, 1825, 



p. 313, pi. XLIX, figs. 1-2. 

 Asellus gronlandicus ? KR0YER, Kongelige danske videnskabernes Selskabs 



naturvidenskabelige og mathematiske Afhandlinger, VII, 1838, p. 318. 

 Asellus aquaticus GUERIN-MENEVILLE, Iconographie du Regne animal de Cuvier, 

 pi. LI, fig. 3. SABS, Histoire naturelle des Crustaces d'eau douce de la 

 Norvege, 1867, p. 46, pis. vm-x. 



Asellus gronlandicus PACKARD, Mem. Bost. Soc. Nat. Hist., I, 1867, p. 296. 

 Asellus aquaticus BATE and WESTWOOD, Brit, Sessile-eyed Crust., II, 1868, p. 341. 

 BOVALLIUS, Bihang till K. Sv. Vet.-Akad., Handl., XI, No. 15, 1886, pp. 

 7-10. (See Bovallius for full synonymy. ) 

 Asellus gronlandicus f HANSEN, Videnskabelige Meddelelser fra den^naturhistoriske 



Forening i Kj0benhavn, 1887-88, p. 190. 

 Asellus aquaticus G. O. SARS, Crust, of Norway, II, 1899, p. 97. 



Localities. Greenland (Fabricius); Greenland (Kr0yer); Labrador 

 at Square Island and Hopedale (Packard); ponds and streams all over 

 Europe. 



FIG. 485. ASELLUS^ ATTENUATUS. a, 



LEO OF THE FIRST PAIR. X 39. 



b, THIRD PLEOPOD OF FEMALE. 

 x 20|. e, FIRST PLEOPOD OF FE- 

 MALE. 



