436 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



CiECIDOTEA NICKAJACKENSIS Packard. 



■ Cn'cidotea lui-kujackeiiM)^ Packard, Amer. Naturalist, XV, 1881, p. 879. — Under- 

 wood, Bull. State Lab. Nat. Hist., II, 1886, p. 359. — Eichardsox, Auier. 

 Naturalist, XXXIV, 1900, pp. 297-298.— Hay, IVh-. V. S. Nat. Mus., XXV, 

 1903, pp. 426-429. 



Localities. — Tennessee; Metcalf. Georgia. 



Body narrow, elongate, about seven times 

 iongei" than wide, 1 mm. : 7 mm. 



Head wider than long, with the anterior mai'- 

 gin excavate. Sides of head entire. Eyes ab- 

 sent. First pair of antennte with the lirst article 

 about twice as long as broad; second article a 

 little longer than the first; third article one- 

 third the length of the second. The flagellum 

 is composed of nine articles. The second pair 

 of antenna" have the first two articles short and 

 about equal in length; the third is about one- 

 half the length of the second; the fourth is as 

 long as the first three taken together; the fifth 

 is one and a half times as long as the fourth. The 

 flagellum is composed of 

 fifty-three articles, and is 

 3^ nun. long. The i)ali) 

 of the maxilliped is com- 

 posed of five articles. 

 The mandil)le has a pal}) 

 of three articles. 



The first four segments 

 of the thorax are about 

 equal in length. The fifth 

 is a little shorter. The 



sixth and seventh are al)out one and a half 



times longer than the fifth. The first three 



segments haA e the epimera i)resent as a very 



small and almost inconspicuous lobe situated on 



the anterior part of the lateral margin. The 



fourth segment has the epimeron situated about fig. 494.— cm^moTEA nkka 



the middle of the lateral margin. The last jackensis (Aftek pai-k- 



. ^ . ARD). a, First antenna. 



three segments have the epimera posteriorly 6_ uropoda. 

 situated. 



The al)domen is composed of three segments; two short ones, sub- 

 e({ual in length, anterior to the long, terminal one. The terminal seg- 

 ment is about twice as long as wide. 1 nun. : '1 mm. It is subquadrate 

 in shai)e. with the post-lateral angles rounded and a very slight indi- 

 cation of a median lobe. The uropoda are shorter than the terminal 



Fn;. 49S.— C.EciDOTEA nicka- 

 .iackensis (After Hay). 

 ■Metcalf. (iEOR(iiA, speci- 

 men. 



