434 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



Second antennae longer than the body; flagellum composed of about eighty- 

 six articles < ';r<-i<lti'<i rlclmrdsonx Hay 



!/. First pair of antennae, with flagellum composed of five articles, extend half the 

 length of the peduncle of the second antenna'. Second pair of antenna* 

 "probably as long as body;" fiagellum is composed of "at least forty seg- 

 ments " deddotea srnitJmi Ulric-h" 



C^CIDOTEA STYGIA Packard. 



Csecidotea slygia PACKARD, Amer. Naturalist, V, 1871, p. 752, figs. 132-133. 

 Cseridotea microcephala COPE, Amer. Naturalist, VI, 1872, p. 411, fig. 109; 3d and 



4th Report Geol. Indiana, 1872, pp. 163, 174-175. SMITH, Amer. Naturalist, 



VII, 1873, p. 244. 

 Ciecidotea tygia PACKARD, 5th Report Peabody Acad. Science, 1873, p. 95. 



SMITH, Report U. S. Commissioner of Fish and Fisheries, 1874, p. 661. 

 Asellus sti/gius FORBES, Bull. 111. State Lab. Nat. Hist., No. 1, 1876, p. 11. 

 Gecidotea ntygia HUBBARD, Amer. Entomologist, new series, I, 1880, pp. 36, 71*. 



80, fig. 10. 



Asellus stygius UNDERWOOD, Bull. 111. State Lab. Nat. Hist., II, 1886, p. 359. 

 C&cidotea stygia RICHARDSON, Amer. Naturalist, XXXIV, 1900, p. 297; Proc. 



U. S. Nat. Mus., XXIII, 1901, p. 553. 



Localities. Graham's Spring, Lexington, Virginia; also Mammoth 

 Cave, Kentucky, and wells in Indiana; Illinois 

 in deep wells; ''Richardson's Spring," Mam- 

 moth Cave, Kentucky. 



Body narrow, elongate, five times longer than 

 wide, 2 mm.: 10 mm. 



Head a little wider than long, 1 mm. : 1 mm., 

 with the anterior margin slightly excavate. 

 The eyes are absent. The first two articles of 

 the first pair of antennse are subequal in length, 

 the second one being more slender than the first; 

 the third article is about two-thirds the length 

 of the second. The flagellum is composed of 

 about twelve articles. The first three articles 

 of the second antenna? are short and about equal 

 in length; the fourth is about as long as the 

 first three together; the fifth is one and a half 

 times longer than the fourth. The flagellum 

 is composed of about seventy articles. The 

 nmxilliped has a palp of five articles. The 

 palp of the mandibles is composed of three 

 articles. 



The segments of the thorax are loosely articu- 

 lated. The lateral margins of the segments are not contiguous, but are 



FlG. 490. C^KCIDOTEA STYGIA 

 (AFTER HAY). 



" The first pair of legs in drcidotea smithsi! are not described in detail; they are 

 simply spoken of as being "subchelate." From the figure, however, they appear 

 to be armed not with triangular processes, but furnished instead with spines on the 

 inferior margin of the propodus. 



