. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 559 to the extreinitv of those lol)es. Eyes present. Body with markings of brown. Six specimens of this species were taken l)y tiie I'. 8. Bureau of Fisheries steamer from the Mississippi River near the Exposition grounds in New Orleans, Louisiana. Parasitic on Bithynis ohionls (Smith). Tijjje.^C^t. No. 21»(».SH, About 6 specimens which shoukl probably ))e referred to this species were found in Escondido River, Nicaragua, 50 miles from Bluetields, l)y Dr. C. W. Richmond; they are parasitic in the
. Bulletin - United States National Museum. Science. ISOPODS OF NORTH AMERICA. 559 to the extreinitv of those lol)es. Eyes present. Body with markings of brown. Six specimens of this species were taken l)y tiie I'. 8. Bureau of Fisheries steamer from the Mississippi River near the Exposition grounds in New Orleans, Louisiana. Parasitic on Bithynis ohionls (Smith). Tijjje.^C^t. No. 21»(».SH, About 6 specimens which shoukl probably ))e referred to this species were found in Escondido River, Nicaragua, 50 miles from Bluetields, l)y Dr. C. W. Richmond; they are parasitic in the branchial cavity of Bithynu acanthuvus (Wieg- maiui). They dill'er from the type as above described in having no antero-lateral processes to the head of the female; in having patches of black on the lateral margins of all the segments of the thorax on one side of the body; and in having sometimes the third and also the fourth lamella? of the incubatory pouch with patches of black. In the male the terminal segment has in some specimens a tendency to be FiC. Oil.—PROBOPYRrS ] THYNisi. Male, x 41. PROBOPYRUS ALPHEI Richardson. Bopyrus Fritz ^IfLLEU, Jenai«'lie Zeitsdirift, VI, 1871, p. 68. Bopj/rus alphei Giakd and Bonxikr, Bull. Sclent., XXII, 1890, p. 869 (nomen nudum). Bopi/rus alphei Richakdsux, Proc. Wash. Acad. Sci., II, 1900, pp. 158-159. Gi/gesp:? H. Y. Wilson, American Naturalist, XXXIV, 1900, p. 358. BopyreUa alphei Bonnier, Trav. do la Station Zool. de Wimereux, VIII, 1900, p. 352. Probopyrus alphei Richardson, Proc. U. S. Nat. Mus., XXVII, 1904, pp. 67-68. Localities.—Beaufort, North Carolina, on Crangon lieterocliselh; mangroves, Rio Parahy})a do Norte, Brazil, on Crangon heterochselis; Desterro, Brazil, on an undetermined species of Crangon (Muller). The bod}' of the female is broadly oval, its greatest width being- equal to its length, broadened anteriorly and narrowed posteriorly. Head widening posteriorly, its antero-lateral angles being pro
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