36 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol.. XXXII. 



although thia supposition may well be held in reserve until we have a more com- 

 plete series of the subterranean species for comparison. C. gracilis occurs as far 

 south as Grand Rapids, ^licliigan, whence we have received specimens from Mr. N. 

 Coleman, and it very likely occurs in the same region as C. packardii. 



The figures are all from Professor Packard's original specimens, collected from 

 wells in Orleans, Indiana, by Dr. Moses Elrod. Only one of the.'-e has the body 

 entire; this is a female, 5.5 mm. long, and from whicli figs. 5 to 8 were made. A 



Fig. 5. — EUCRANGONV.V PACKARDII 



(After Smith.) ah, terminal portiox of the abdomen 



WITH THE UROPODA. 



large specimen, a female about 7.5 mm. long, unfortunately wanting most of the 

 antennulee and antennse, collected from a well at New Albany, Indiana, by Dr. John 

 Sloan, was sent to Doctor Packard for examination. 



Genus NIPHARGUS W. P. Hay. 



NIPHARGUS ANTENNATUS (Packard). 



Crangonyx antennatus Fackard, Am. Nat., XV, 1881, p. 880. 



Eucrangonyx antennatus Stbbbihg, Trans. Linn. Soc. London, 2d ser., VII, 1899, 



p. 423. 

 Niphargus antennatus W. P. Hay, Proc. U. S. Nat. Mus., XXV, 1902, p. 429. 



Eyes composed of a few slightly pigmented facets or wanting alto- 

 gether, when present of no definite shape. First antennte more than 

 half as long as the body; first and second segments of the peduncle 

 nearly equal in length, slightly longer than the third; flagellura about 

 three times as long as the peduncle, composed of about twentj^-five 

 segments in the female; the number of segments in the flagellum 

 varies in the two sexes according to Hay's description, there being- 

 more in the female than in the male; secondary flagellum longer than 

 the basal segment of the primar}^ one, compo.sed of two segments, the 

 di.stal one very short; each segment furnished distall}' with a few long 

 hairs. Second antennae not half so long as the first pair; flagellum 

 short,- not greatly exceeding the third segment of the peduncle and 

 composed of about eight segments. 



