ISOPODS OF NORTH AMERICA. 



413 



MANCASELLUS MACROURUS Garman. 



Mancasellus macrourvs (takm.w, Bull. Essex .Institute, XXII, 1890, pp. 28-30. — 

 RicHAKDsox, American Naturalist.'XXXIV, 1900, i). 297. — IIav, Proc. U.S. 

 Nat. Mu8., XXV, 1903, pp. 423-424. 



Localities. — Kentuck}-; Tennessee; John Ross sprino-, at Rossville, 

 (i(M)roiii; outside Nicka jack Cave; "Old^Iill" Devils Backbone, Ham- 

 ilton Count}', Ohio; Kodbank, Hamilton County, Ohio; Batavia Junc- 

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

 Mannnoth Cave, 'Kentucky. 



Body oblong'-ovate, nearly two and a halt" times longer than wide, 

 5 mm. : \'2 nun. Sides of body nearly parallel. 



Head three times wider 

 than long, 1 mm. : 8 nun., 

 with the anterior part 

 slio-htlv narrower tlian the 



Fk;. 4t;2. — Ma.ncasei.hs mackolkis (After Garmax). a, 

 Outline of one side of head. 6, One of second genitai, 



PLATES OF male. C, MaNDIBLE. d, HAND. C, UROPOD. 



Fig. 463.— MANCA.SELi.r.s ma 

 CROURfs (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 latei'al 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 antenna' have the l)asal 

 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 



