ISOPODS OF NOBTH AMEEICA. 



413 



MANCASELLUS MACROURUS Garman. 



Mancasellus macrourus GARMAX, Bull. Essex Jnstitute, XXII, 1890, pp. 28-30. 

 RICHARDSON, American Naturalist,*XXXIV, 1900, p. 297. HAY, Proc. U. S. 

 Nat. Mus., XXV, 1903, pp. 423-i24. 



Localities. Kentucky; Tennessee; John Ross spring, at Rossville, 

 Georgia; outside NickajackCave; "Old Mill" Devils Backbone, Ham- 

 ilton County, Ohio; Redbank, Hamilton County, Ohio; Batavia Junc- 

 tion, Ohio; Westwood, Cincinnati, Ohio (J. Lindahl); Echo River, 

 Mammoth Cave, "Kentucky. 



Body oblong-ovate, nearly two and a half times longer than wide, 

 5 mm. : 12 mm. Sides of body nearly parallel. 



Head three times wider 

 than long, 1 mm. : 8 mm., 

 with the anterior part 

 slightly narrower than the 



FIG. 462. MANCASELLUS MACKOURUS (AFTER GARMAN). a, 

 OUTLINE OF ONE SIDE OF HEAD. 6, ONE OF SECOND GENITAL 

 PLATF.S OF MALE. C, MANDIBLE, d, HAND, e, UROPOD. 



FIG. 463. MANCASELLUS MA 

 CROURUS (AFTER HAY). 



posterior part, the anterior margin slightly excavate on either side 

 of a small median point, and again emarginate on either side of two 

 small points, each lateral to the median point. The lateral margin is 

 cleft on either side near the base, just lateral to the eyes, and the pos- 

 terior part of the lateral margin below the cleft is produced into a 

 'small lobe on either side. The eyes are small, round, composite, situ- 

 ated near the lateral margins. The first pair of antennae have the basal 

 article large and dilated, and it extends to the end of the second article 

 of the peduncle of the second pair of antennae; the second article is a 



